Chapter 5 - Troubleshooting. Figures

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1 The st Century R-A/URR Reference YK-R Edited /: No Technical Changes Chapter - Troubleshooting Page Table Of Contents -. Introduction -. Maintenance Turn-On Procedure -. Relays, Lamps, and Overload Devices -. Troubleshooting Information -. Trouble Isolation Procedures. -. Zoning For Schematic Diagrams Figures - Thru Figures - - Figures Figure - Terminal Numbers of RF and Variable IF Coils - Figure - Fabrication of Coaxial test Cables - Figure - Fabrication of Multi-conductor Test Cables - Figure - RF Sub-chassis, Voltage and Resistance Diagram - Figure - Crystal Oscillator Sub-chassis, Voltage Resistance Diagram - Figure - IF Sub-chassis, Voltage and Resistance Diagram - Figure - VFO Sub-chassis. Voltage and Resistance Diagram - Figure - AF Sub-chassis, Voltage and Resistance Diagram - Figure - Power Supply Sub-chassis, Voltage and Resistance Diagram - Figure - IF and AF Sub-chassis Resistor and Capacitor Terminal Boards, Diagram - Figure - Power Distribution Diagram - Figure - Filament and Oven Circuits - Figure - Field Changes - Figure - Signal Flow Diagram, Part of - RF Stage - Figure - Signal Flow Diagram, Part of - Mixer Stages - Figure - Signal Flow Diagram, Part of - IF Stages - Figure - Signal Flow Diagram, Part of - Audio Stages - Figure - Schematic Diagram, Part of - RF Amplifier - Figure - Schematic Diagram, Part of - st Mixer and st Crystal Oscillator - Figure - Schematic Diagram, Part of - nd Mixer and VFO - Figure - Schematic Diagram, Part of - nd Crystal Oscillator - Figure - Schematic Diagram, Part of - IF Amplifiers, AGC, Limiter and Detector - Figure - Schematic Diagram, Part of - Line and Local Audio Amplifiers. - Figure - Schematic Diagram, Part of - Power Supply - Figure - Power Distribution Levels - July Page - Chapter Troubleshooting

2 The st Century R-A/URR Reference YK-R Tables Table - Troubleshooting Index - Table - Maintenance Turn-On Procedure - Table - Relays, Lamps, and Overload Devices - Table - Test Cable Data - Table - Trouble Isolation - Table - Transformer and Coil Resistances - Table - Connector Resistance Measurements - Table - Schematic Component Location Zones. - July Page - Chapter Troubleshooting

3 The st Century R-A/URR Reference YK-R. Introduction.. Troubleshooting is a logical procedure used to locate a fault in equipment. The procedure given here is based on knowledge of electronic fundamentals, a thorough understanding of the radio receiver, and the application of information contained in this handbook... One step in troubleshooting, symptom recognition, depends upon experience with equipment operating characteristics. Daily observation of the normal operation of the receiver helps one to recognize an abnormal condition if it should occur... A second step, symptom elaboration, calls for the use of front panel controls, meters, and output devices to obtain better identification of the trouble. The maintenance turn-on procedure can be used to advantage in this step... Following this, a logical decision can be made to select the most likely function responsible for the faulty operation. Here the over-all functional description (para.) and its associated block diagram can be used as an aid... Tests must then be made to determine whether the chosen function is the faulty one. The signal flow diagram is used in this step to find appropriate test points. Key steps in the trouble isolation tables provide normal indications as an aid in these tests and measurements... When trouble is found in a certain function, it must be localized to a circuit and then a detail part. This is accomplished by following step-by-step procedures in the trouble isolation tables. Again, the signal flow diagram is useful, especially when supplemented by schematic diagrams and voltage and resistance charts. Functional and circuit descriptions should also be consulted... Assuming that a faulty circuit and part is found, a review of the situation is in order, to determine whether the part is the cause of the trouble or that some other malfunction has caused the part to become defective... General references were made above to a number of troubleshooting aids. More specific paragraph references are given in table - as they pertain to the individual subassemblies. July Page - Chapter Troubleshooting

4 The st Century R-A/URR Reference YK-R Table - - Troubleshooting Index Sub- Assembly AF Crystal Oscillator IF Mainframe Mechanical Power supply RF VFO Voltage & Resistance (Fig. No.) Parts Location (Fig. No.) -, -, , -, -, -, - -, -, - -, -, - - -, -, -, - - -, -, -, -, - - -, - - -, -, - - -, - (Para. No.) Adjustment (Fig. No.) Remove & Replace (Para. No.) ,....,..,..,..,.. -.., ,....,..,.. -, -.. through ,..,..,.. -, -.. through ,.. July Page - Chapter Troubleshooting

5 The st Century R-A/URR Reference YK-R. Maintenance Turn-On Procedure.. The maintenance turn-on procedure (table -) is a step-by-step procedure to be used by maintenance personnel in bringing the equipment to an operating condition from a completely secured condition. Normal conditions are noted along with steps to be followed and reference paragraphs to be used if indications are abnormal,.. If dial lamps fail to light, check the AC input fuse F and the AC input connections. Measure the AC Input voltage (see table -). Check the. volt circuits (figures - and -). If no signal is heard, proceed with next step in table -... If at least one band is normal, make receiver RF-IF checks on faulty bands beginning with step of table -. If all bands are abnormal, begin at step of table -... AGC circuits could be faulty. Perform steps, and of table -... Check RF input circuits, figure -, zone C... Perform steps and of table -. Table - Maintenance Turn-On Procedure Prior Control Settings: AUDIO RESPONSE switch: Wide BANDWIDTH switch: KC RF GAIN control: LIMITER control: OFF LOCAL GAIN control: ANTENNA: connected Loudspeaker or Headphones connected July Page - Chapter Troubleshooting

6 The st Century R-A/URR Reference YK-R Table - Maintenance Turn-On Procedure - Continued Step Action Or Condition Normal Indication Turn FUNCTION switch to AGC. Dial lamps light. Rushing noise or signal heard in speaker or headset. Set MEGACYCLE CHANGE control at each band in turn. Tune KILOCYCLE CHANGE control across any band and then to one signal... Normal signal output on each band... CARRIER LEVEL meter indicates strength of received signals. Rotate ANT TRIM control. Obtain peak indication on CARRIER LEVEL meter for each band. Rotate LOCAL GAIN control in either direction. Rotate LINE GAIN control in either direction, Rotate RF GAIN control in either direction. With receiver tuned away from any signal turn FUNCTION switch to MGC. Turn FUNCTION switch to AGC and tune KILOCYCLE CHANGE control through several different signals. Turn FUNCTION switch to CAL and tune KILOCYCLE CHANGE control. Volume at loudspeaker or headset increases or decreases. LINE LEVEL meter indication increases or decreases. Audio output and CARRIER LEVEL meter indication increase or decrease. Noise level should increase slightly and CARRIER LEVEL should not indicate Output volume nearly constant... Deflection of at least db on CARRIER LEVEL meter at each khz reading. Turn LIMITER fully clockwise. Noise peaks are reduced in amplitude; audio distortion increases. * Turn BREAK IN relay switch to ON and short BRK IN terminal on rear panel to ground momentarily. Turn LINE METER switch to and adjust LINE GAIN control for a meter indication at VU mark. Break-in relay functions to silence receiver Meter adjusts to VU mark ( db)... Turn LINE METER switch to +. LINE LEVEL meter indicates -... Turn LINE METER switch to -. Meter indicates off scale to right... Turn LINE METER switch to OFF. No indication on LINE LEVEL meter... July Page - Chapter Troubleshooting

7 The st Century R-A/URR Reference YK-R Table - Maintenance Turn-On Procedure - Continued Step Action Or Condition Normal Indication Turn BFO control to ON, tune in a CW signal and vary the BFO PITCH control. Turn BANDWIDTH switch from khz to. khz. Operate AUDIO RESPONSE switch through both positions. *For Shore Stations only. Beat note of signal is audible and varies... Selectivity becomes sharper and noise decreases. Only low frequency tones are heard in the counterclockwise positions. Permits amplification of full AF range in WIDE position and Hz in SHARP position Perform step of table -... Perform step of table -... Check cathode bias line, figure -, zone D and figure -, Zone A... Check MGC switching circuit, figure -, zone B... Perform AGC circuit tests given in steps, and of table -... Perform calibration oscillator tests given in steps, and of table -... Check limiter circuit, figure -, zone D or perform step of table -... Check break-in relay circuits shown in figure -, zone A and figure -, zone C... Perform line AF amplifier tests given in step of table -... Check line meter switching circuits shown in figure -, zone D... Check BFO circuit shown in figure -, zone D... Check IF filter circuits shown in figure -, zone B... Check AF filter circuits shown in figure -, zone A. July Page - Chapter Troubleshooting

8 The st Century R-A/URR Reference YK-R. Relays, Lamps and Overload Devices Table - - Relays, Lamps, and Overload Devices Reference Designation Functional Name Of Item Or Circuit Energizing Voltage And/Or Rating Figure Reference Relays K K Antenna relay Break-in-relay VDC..VDC. -, - -, -, - Lamps I Pilot lamp V.. amp - I Pilot lamp V.. amp - I Antenna overload V. / watt - Fuses F ll AC Input fuse With V input: amp (Ovens switch On) - amp (Ovens switch Off) With V input: -/ amp (Ovens switch On) amp (Ovens switch Off) F Main B+ line / amp - F RF - IF B+ line / amp - July Page - Chapter Troubleshooting

9 The st Century R-A/URR Reference YK-R. Troubleshooting Information.. Troubleshooting efficiency can be improved through the knowledge and intelligent use of the many aids available to the technician. For example, the R-A/URR Receiver is equipped with a number of built-in features which can be used to advantage in troubleshooting. These features will be discussed here along with other suggestions concerning good practices for detecting and locating trouble... Visual Inspection. The importance of performing a careful visual inspection before launching into functional or detailed troubleshooting is often overlooked. Some suggestions, which can be enlarged upon by an observant technician, are given in table Visual inspection can be broken down into external and internal areas of inspection. External inspection includes power and signal input connections, rear terminal board linkages, and output signal connections.. Check the input power connector, the fuses and fuse holders. See table - for proper fuse ratings.. Inspect the antenna input connections.. Inspect the audio output connections and phone jack.. Check the jumpers on the rear panel terminal boards which provide audio and AGC linkages.. Check for loose or missing knobs, or damage to meters.... Internal inspection concerns tubes and connectors. See that tubes are unbroken, are properly seated in their sockets and are equipped with tube shields where applicable.. Observe that all subassemblies are securely fastened and completely interconnected.. Look for any evidence of overheated components or charred or frayed insulation... Built-In Troubleshooting Aids. The built-in features of the equipment which aid the maintenance man include the following: carrier level meter, line level meter, and calibration oscillator. The output transducers, phones or speaker, can also be used as sensing devices for the detection of trouble. The CARRIER LEVEL meter measures the relative signal strength of the incoming RF or test signals. Indications on this meter are proportional to those at the AGC terminals on the rear panel of the receiver. The LINE LEVEL meter readings can be translated into audio output or power ratio readings. The LINE METER switch extends the range of the LINE LEVEL meter over a -db range. July Page - Chapter Troubleshooting

10 The st Century R-A/URR Reference YK-R... The calibration oscillator, while designed primarily for calibration checks can also be used in conjunction with the CARRIER LEVEL meter for rough sensitivity checks across the entire frequency range (refer to table -, step ). The phones or speaker can also be used for rough sensitivity checks by listening to the relative signal or noise levels. Then too, other faults such as excessive hum, noise, or interference, or intermittent conditions can be detected by this means.... These built-in features can be used to advantage by performing the maintenance turn-on-procedures (table.) and making the appropriate observations. Duh, REALLY?.. Trouble Isolation. Physically, the equipment consists of a main frame and six sub-chassis as listed in table -. Functionally, the receiver can be divided into four subsystems, namely, the power supply, the AF, the IF, and the RF circuits. The trouble isolation table (-) is based on this functional approach, and tests are arranged in the order named above.... Steps, and are concerned with power supply tests, since this function is common to and required by the other three functions. Steps through concern the audio circuits. Steps and check out the over-all audio function. Steps and are entered only if there is audio trouble; they are stage-by-stage checks that progress from output to input. Steps and concern, the IF circuits. Step checks out the overall IF function. Step is a stage-by-stage check, that progresses from the detector back to the RF circuits. Steps through are stage-by-stage RF circuit checks which lead back from the third mixer to the antenna.... The RF function includes several local oscillators which, since they are internal signal generators, can be checked independently as described in paragraph... In addition, AGC circuits are checked in steps, and, and calibration oscillator circuits are checked in steps, and... Sub-chassis Removal for Troubleshooting. Caution: Do not attempt removal or replacement of parts or sub-chassis before reading the instructions in paragraph.. through When testing or troubleshooting the receiver, do not remove a sub-chassis unless it is absolutely necessary. Test cables are required for operating a sub-chassis out of the receiver (para..). If a receiver in good operating condition is available, a sub-chassis may be connected from it, directly into the receiver being repaired. Note: Avoid disturbing the synchronization of the RF gear train assembly with the RF, crystal oscillator, or VFO sub-chassis. July Page - Chapter Troubleshooting

11 The st Century R-A/URR Reference YK-R... To avoid removing a sub-chassis when voltage is to be measured or when a signal is to be injected at a tube-socket pin that does not have a test point, remove the tube and use a tube adapter with test points. The RF tuning coils and transformers on the RF sub-chassis can be removed readily (para....), if necessary, to permit measurement of voltage or resistance at the socket contacts, or measurement of the voltage or resistance at the socket contacts, or measurement of the continuity of the coils. If trouble is suspected in the RF sub-chassis, perform as much detailed troubleshooting as possible before removing it to be sure that the trouble is in the sub-chassis, since removal and replacement of this sub-chassis is time-consuming.... Figure - shows the numbers of the terminals on the RF and the variable IF coils as seen from the bottom of the RF sub-chassis. These numbers are used to identify the terminals in the schematic diagrams in this manual. Table - - Test Cable Data From Plug No. Cable Type To Jack No.. Trouble Isolation Procedures Co-axial Test Cables P RG-/U J P RG-/U J P RG-/U J P RG-/U J P RG-/U J P RG-/U J P RG-/U J Multi-Conductor Test Cables P J P All shielded and J P unshielded wires to be J P no smaller than J P gauge stranded wire. J P Refer to figure -. J P J.. Test Cable Data (See figures - and -). Test cables are required when operating sub-chassis out of the receiver. Make all cables inches long. Table - contains plug and jack reference designations for each test cable required. July Page - Chapter Troubleshooting

12 The st Century R-A/URR Reference YK-R.. Initial Control Settings. Use the control settings given below before performing any test or troubleshooting procedure. Many of the tests that follow repeat some of these settings, and others refer back to this paragraph to stress the importance of using the proper control settings. Observe these control settings, and change them only when instructions in a particular procedure direct different control settings. LINE METER OFF ANT TRIM, or maximum output LINE GAIN BFO OFF AGC MED DIAL LOCK Unlocked, fully counterclockwise LIMITER OFF ZERO ADJ Disengaged, fully counterclockwise AUDIO RESPONSE WIDE LOCAL GAIN, or desired volume BANDWIDTH OVENS OFF BFO PITCH MEGACYCLE CHANGE, or as specified BREAK IN OFF KILOCYCLE CHANGE, or as specified FUNCTION MGC RF GAIN.. Oscillator Injection Voltage Tests (See figures - through -.) To check the conversion oscillators (V, V, and V) to see if they are oscillating, turn the FUNCTION switch to STANDBY to remove B+ from all tubes except the conversion oscillators. The cathodes and control grids of the mixers act as rectifiers of the oscillator voltage at test points E, E, and E. The voltage at test point E (figure -) is the grid leak bias at the control grid of V... Check the DC voltage at test points E, E, E, and E with Electronic Multi-meter USM-. ( ) The voltage should be as follows: Test Point *E -. to -. E -. to -. Voltage E -. to -. (-. to -. with FC-) E - to - *To obtain a meter indication at test point E, the receiver must be tuned below MHz July Page - Chapter Troubleshooting

13 The st Century R-A/URR Reference YK-R Z- Z- Z- Z- T T Z- Z- Z- Z- Z- Z- Z- Z- Z- Z- Z- Z- Z- Z- T T T T T T DWG BY KHGRT Figure - Terminal Numbers of RF and Variable IF Coils Rev: // Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

14 The st Century R-A/URR Reference YK-R CRIMP HERE CLAMP NUT BRAID CLAMP -/ TIN INSULATOR BUSHING CONTACT STRAIGHT PLUG CRIMP HERE CLAMP NUT BRAID CLAMP -/ TIN SPOT STAKE OR SOLDER SOLDER CONDUCTOR ANGLE PLUG. INSERT CLAMP NUT OVER CABLE. INSERT BRAID CLAMP OVER CABLE JACKET, PLACE AT DIMENSION SHOWN AND WITH PLIERS CRIMP SLOTTED END INTO CABLE JACKET. DO NOT EXCESSIVELY DISTORT SLOTTED END. CLAMP NUT MUST RIDE FREE OVER CRIMPED PORTION. REMOVE CABLE JACKET BACK TO END OF BRAID CLAMP.. COMB OUT BRAID WIRES, FORM BACK OVER BRAID CLAMP AND TRIM TO LENGTH. CUT OFF CABLE DIELECTRIC AS SHOWN. CUT INNER CONDUCTOR TO / AND TIN.. INSERT INSULATOR BUSHING OVER CONDUCTOR. TIN END OF CONTACT HOLE AND SWEAT CONTACT TO CONDUCTOR. OUTSIDE SURFACE OF CONTACT MUST BE FREE OF SOLDER.. INSERT INSULATOR OVER CONTACT. INSERT ASSEMBLY, LESS CLAMP NUT, INTO PLUG BODY AND ROTATE SLIGHTLY TO MADE SURE BRAID CLAMP IS SEATED. THREAD CLAMP NUT INTO BODY AND TIGHTEN NUT BY HOLDING KNURLED PORTION OF BODY WITH SOFT-NOSED PLIERS.. INSERT CLAMP NUT OVER CABLE. INSERT BRAID CLAMP OVER CABLE JACKET, PLACE AT DIMENSION SHOWN, AND WITH PLIERS CRIMP SLOTTED END INTO CABLE JACKET. DO NOT EXCESSIVELY DISTORT SLOTTED END. CLAMP NUT MUST RIDE FREE OVER CRIMPED PORTION. REMOVE CABLE JACKET BACK TO END OF BRAID CLAMP.. COMB OUT BRAID WIRES, FORM BACK OVER BRAID CLAMP AND TRIM TO LENGTH. CUT OFF CABLE DIELECTRIC AS SHOWN. CUT INNER CONDUCTOR TO / AND TIN.. INSERT ASSEMBLY, LESS CLAMP NUT, INTO ANGLE PLUG BODY AND ROTATE SLIGHTLY TO MAKE SURE BRAID CLAMP IS SEATED. THREAD CLAMP NUT INTO BODY AND TIGHTEN NUT. WITH CAP REMOVED, SOLDER CONDUCTOR IN SLOT OF ANGLE PLUG CONTACT. INSERT CAP IN HOLE AND SPOT SOLDER OR SPOT STAKE TO RETAIN CAP. CRIMP HERE CLAMP NUT BRAID CLAMP. INSERT CLAMP NUT OVER CABLE. INSERT BRAID CLAMP OVER CABLE JACKET, PLACE AT DIMENSION SHOWN AND WITH PLIERS CRIMP SLOTTED END INTO CABLE JACKET. DO NOT EXCESSIVELY DISTORT SLOTTED END. CLAMP NUT MUST RIDE FREE OVER CRIMPED PORTION. REMOVE CABLE JACKET BACK TO END OF BRAID CLAMP. -/ TIN. COMB OUT BRAID WIRES, FORM BACK OVER BRAID CLAMP AND TRIM TO LENGTH. CUT OFF CABLE DIELECTRIC AS SHOWN. CUT INNER CONDUCTOR TO / AND TIN. INSULATOR BUSHING CONTACT. INSERT INSULATOR BUSHING OVER CONDUCTOR. TIN END OF CONTACT HOLE AND SWEAT CONTACT TO CONDUCTOR. OUTSIDE SURFACE CONTACT MUST BE FREE OF SOLDER. MOUNTS THRU.-. PANEL WITH SPACER MOUNTS THRU.-. PANEL WITHOUT SPACER JACK SPACER. INSERT ASSEMBLY, LESS CLAMP NUT, INTO JACK BODY AND ROTATE SLIGHTLY TO MAKE SURE BRAID CLAMP IS SEATED. THREAD CLAMP NUT INTO HEX COUPLING AND TIGHTEN NUT. WHEN JACK IS PANEL MOUNTED IT IS NECESSARY TO MOUNT FRONT BODY THRU PANEL, INSERT SPACER (IF REQUIRED) AND LOCK WASHER AND THREAD ON HEX COUPLING BEFORE INSERTING CABLE ASSEMBLY. CABLE TERMINATION: ASSEMBLY INSTRUCTIONS FOR CABLE TERMINATIONS ARE IDENTICAL WITH THOSE GIVEN IN STEPS AND FOR STRAIGHT PLUGS EXCEPT DIMENSIONS FOR CUTTING CABLE DIELECTRIC AND CENTER CONDUCTOR ARE OPTIONAL. Rev: // DWG BY KHGRT Courtesy of Pete Wokoun, KHGRT Figure - Fabrication of Coaxial test Cables July Page - Chapter Troubleshooting

15 The st Century R-A/URR Reference YK-R S P S P S P-J CABLE ASSEMBLY P-J CABLE ASSEMBLY P-J AND P-J CABLE ASSEMBLIES S P NOTES: A B C D E F H J K S A B C D E F H P-J AND P-J CABLE ASSEMBLIES P-J CABLE ASSEMBLY. ALL UNSHIELDED WIRES TO BE NO SMALLER THAN GAGE STRANDED WIRE. ALL SHIELDED WIRES TO BE NO SMALLER THAN GAGE SHIELDED.. LACE OR TAPE COMPLETED CABLES.. MAXIMUM CABLE LENGTH SHALL BE INCHES.. CHECK CONTINUITY AFTER COMPLETING FABRICATION.. LABEL CABLES FOR IDENTIFICATION. P A B C D E F H J K P A B C D E F H Rev: // DWG BY KHGRT Courtesy of Pete Wokoun, KHGRT Figure - Fabrication of Multi-conductor Test Cables July Page - Chapter Troubleshooting

16 . VAC. - K K The st Century R-A/URR Reference YK-R -KC MULTIVIBRATOR V A K SEE NOTE - K CALIBRATION OSC AND -KC CATHODE FOLLOWER V A. VAC.. -. MEG K SEE NOTE K -. K SEE NOTE. VAC... ST CRYSTAL OSC V /AKW K () K (K) (NOTE ).. -. K V V V NOTES: RD MIXER V C. VAC. NC NC K -. MEG (NOTE )..K V V. TO OBTAIN MEASUREMENTS SHOWN ON V AND V, OPERATE RECEIVER BELOW MHZ.. TO OBTAIN MEASUREMENTS SHOWN ON V AND V, SET FUNCTION SWITCH IN CAL POSITION. V V. OBTAINED WITH RF GAIN CONTROL COMPLETELY CLOCKWISE.. OBTAINED WITH FUNCTION SWITCH IN THE AGC POSITION.. MEASUREMENTS AT V, PIN IN ( ) ARE FOR RECEIVERS BEARING ORDERS NO. -P-, -P-, -P- (RF MOD ), AND ORDER NO. -P- (RF MOD ).. VALUES IN ( ) FOR FC ONLY. RF AMPL V DC. VAC.. (NOTE ) K K. () () (NOTES and ) -. MEG (NOTE ) -.. MEG (NOTE ) NC. VAC. ST MIXER V C SEE NOTE..K K NC..K -.. MEG (NOTE ) K NC ND MIXER V C NC. VAC. Rev: // DWG BY KHGRT Figure - RF Sub-chassis, Voltage and Resistance Diagram Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

17 The st Century R-A/URR Reference YK-R V K K. VAC. K ND CRYSTAL OSCILLATOR V /AKW K R K R L R. VAC... VAC.. -. K K K. Rev: // DWG BY KHGRT Figure - Crystal Oscillator Sub-chassis, Voltage Resistance Diagram Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

18 . (NOTE ) -. K (NOTE ). (NOTE ) ND IF AMPL V /BAW The st Century R-A/URR Reference YK-R. VAC. K K. (-K) (NOTE ) -. K (NOTE ). (-K) (NOTE ) RD IF AMPL V /BAW NOTE. VAC. K K AGC TIME CONSTANT AND DETECTOR V A NOTE -. K () K. VAC.. -. (- ) K (K) -. (- ) K (K) -. K (K) (NOTE ) - (NOTE ) TH IF AMPL V AK. VAC. K K -. K (NOTE ) ST IF AMPL V /BAW. (NOTE ) K K. K (NOTE ) K. VAC. V V V V V V V V V RT CURRENT REGULATOR RT TF NC. VAC. NC NC NC NC VAC NC NC -. K (K). VAC. AGC RECTIFIER AN D IF CATHODE FOLLOWER V A NOTE -. K (K). K (-.) K (k) (+.) K (K) (-.). M (K) LIMITER V A NOTE (-.) K (K) (+.) K (K). VAC. (-.). M (K) K. VAC. K AGC I F AMPL V /BAW NOTE. MEG -. K (K) -. K. BFO V /BAW NOTE VAC. VAC K ( ) K ( ) NOTES:. VOLTAGE AND RESISTANCE READINGS ON V ARE WITH A NORMAL SETTING OF THE GAIN ADJ CONTROL R. MINIMUM (CLOCKWISE) AND MAXIMUM (COUNTER-CLOCKWISE) SETTINGS CHANGE VOLTAGE READINGS AS FOLLOWS: P I N N O. R MIN: MAX: RESISTANCE VALUES IN ( ) INDICATE RANGE OF READINGS DEPENDING UPON SETTING OF R.. SET BFO SWITCH TO ON POSITION. RESISTANCE VALUES OF PINS AND IN ( ) ARE TAKEN WITH BFO SWITCH IN OFF POSITION.. RESISTANCE READINGS OF PIN IN ( ) TAKEN WITH FUNCTION SWITCH SET TO MGC. VALUES OF PINS AND IN ( ) TAKEN WITH LIMITER CONTROL SET TO.. VALUES IN ( ) TAKEN WITH LIMITER CONTROL SET TO.. RESISTANCE VALUES IN ( ) TAKEN WITH FUNCTION SWITCH SET TO MGC.. RF GAIN CONTROL COMPLETELY CLOCKWISE.. FUNCTION SWITCH IN AGC POSITION.. RESISTANCE OF PIN VARIES WITH SETTING OF CARR METER AD J CONTROL R. Rev: // DWG BY KHGRT Figure - IF Sub-chassis, Voltage and Resistance Diagram Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

19 The st Century R-A/URR Reference YK-R VARIABLE FREQUENCY OSCILLATOR V /BAW V. -. K () K (K) (NOTE ) K. VAC. NOTE : VALUES IN ( ) FOR FC ONLY. Rev: // DWG BY KHGRT Fig. - VFO Sub-chassis. Voltage and Resistance Diagram Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

20 ..K The st Century R-A/URR Reference YK-R ST AF AMPL AN D AF CATHODE FOLLOWER V A K K K. K..K. VAC NC NC VOLTAGE REGULATOR V A NC K NC NC V. K LOCAL AF AMPL AN D L I N E AF AMPL V A K K K.. VAC. LOCAL AF OUTPUT V AK V V. VAC. K k k. V V LOCAL AF OUTPUT V AK. VAC. K k k Rev: // DWG BY KHGRT Courtesy of Pete Wokoun, KHGRT Figure - AF Sub-chassis, Voltage and Resistance Diagram July Page - Chapter Troubleshooting

21 The st Century R-A/URR Reference YK-R V V RECTIFIER V ZW RECTIFIER V ZW K NC. VAC. VAC VAC NC NC K K NC. VAC. VAC VAC NC NC K NOTE: FC REPLACES V AND V WITH CR AND CR. Rev: // DWG BY KHGRT Figure - Power Supply Sub-chassis, Voltage and Resistance Diagram Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

22 The st Century R-A/URR Reference YK-R K. (-.) K (K) -. K (K) (.) K (K) (-.). MEG (K) C R R R C R L C C R K. TB IF SUBCHASSIS TB LIMITER CONTROL SET AT OFF; VALUES IN ( ) W ITH LIMITER SET AT.. K.. K K K. K K K -. -.K K -. -.K K K K. K..K..K. K TB R R R R R R R R R C C C R C Depends on LOCAL GAIN setting C Depends on LINE GAIN setting R R C R R -. K AF SUBCHASSIS -. K -. K(K) (.) (K). MEG DWG BY KHGRT Rev: // Figure - IF and AF Sub-chassis Resistor and Capacitor Terminal Boards, Voltage and Resistance Diagram Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

23 The st Century R-A/URR Reference YK-R.. Receiver RF - IF Gain Test. The receiver RF - IF gain test checks receiver operation from the antenna through detector VB. If the result of this test is normal, the fault is in the audio portion of the receiver.. Connect Multi-meter AN/PSM-( ) to the DIODE LOAD test jack on the front panel of the receiver and set meter controls for measuring - VDC.. Connect Signal Generator AN/URM-( ) to UNBALANCED ANT WHIP jack J on the back of receiver and set the controls for a CW output of micro-volts. (J must have short inserted if FC- is installed.). Tune Signal Generator AN/URM-( ) and the receiver to the same frequency. Readjust the KILOCYCLE CHANGE control slightly for a maximum indication on the AN/PSM-( ). Peak ANT TRIM control.. Adjust the output of the AN/URM-( ) for a meter indication of - volts, If the AN/URM- ( ) output is between and microvolts, the RF - IF gain of the receiver is normal.. If the AN/URM-( ) output is above or below the limits set in above, readjust the AN/URM-( ) output for microvolts. Adjust GAIN ADJ control R (figure -) for a meter indication of - volts. If this adjustment fails to restore normal operation, perform detailed checks of the IF and RF stages beginning with step of table -... Trouble Isolation Table. The procedures in table - can be used to rapidly localize trouble to a particular stage. Preset the receiver front-panel controls as directed in paragraph... Use tube adapters to make connections where test jacks are not provided. Refer to figures - and - through -. Table - - Trouble Isolation Step No. Test Instructions Connect positive lead of Multi-meter AN/PSM-( ) to F terminal and negative lead to ground. Connect positive lead of Multi-meter AN/PSM-( ) to F terminal and negative lead to ground. Sig. Gen Output Control Normal Indication Instructions N/A + VDC. If indication is correct, proceed to next step.. If indication is incorrect, check ac input circuit and power supply sub-chassis (figure -). N/A + VDC. If indication is correct, proceed to next step.. If indication is incorrect, check filter circuits in AF sub-chassis (figure -). July Page - Chapter Troubleshooting

24 The st Century R-A/URR Reference YK-R Step No. Test Instructions Connect positive lead of Multi-meter AN/PSM-( ) to test point E on AF subchassis. Connect Signal Generator AN/URM-( ) to pin grid of V. Set CARRIER LEVEL to in CW mode and then set controls for an output of khz with % Hz modulation. Set LINE METER switch to - and LINE GAIN control to. With the signal generator set up as in step, connect Electronic Multi-meter ME- D/U to PHONES jack J on the front panel. Connect Audio Signal Generator AN/URM- to the following points and adjust its output to the given setting. Set the frequency to Hz. Set LINE METER switch to. Set LINE GAIN control to. Pin Grid V Pin Grid VB Pin Grid VB Pin Grid VA Pin Grid V Sig. Gen Output Control Normal Indication Instructions N/A + VDC. If indication is correct, power supply circuits are normal. Proceed with next step.. If indication is incorrect, check voltage regulator V circuit (figure -)..V - VU min. If indication is correct, proceed to step.. If indication is incorrect, proceed to step..v - db min. If the multi-meter reading is at least - db, proceed to step.. If reading is incorrect, proceed to step..v.v.v.v.v VU min VU min VU min VU min VU min. Continue from stage to stage until an incorrect indication is obtained. The last circuit checked is defective or if all indications are correct, the trouble lies in detector circuit VB (figure -). July Page - Chapter Troubleshooting

25 The st Century R-A/URR Reference YK-R Step No. Test Instructions Connect Electronic Multimeter ME- D/U to PHONES jack J and Audio Signal Generator AN/URM- to the following points and adjust its output to the given setting. Set the frequency to Hz. Pin Grid V Pin Grid VA Pin Grid VB Set Signal Generator AN/URM-( ) for an output of khz with % Hz modulation and connect it to test point E. Set LINE METER to and LINE GAIN to. With the signal generator set up as in step, connect to the following points in turn. Pin Grid V Set LINE METER (LM) to - and LINE GAIN (LG) to Pin Grid V Set LM to -, LG to Pin Grid V Set LM to -, LG to Pin Grid V Set LM to -, LG to Change the signal generator frequency to MHz, check carrier level and % Mod, and connect to test point E. Tune the receiver KILOCYCLE CHANGE control above on the counter dial to a peak indication on the LEVEL METER. Set LM to -, LG to. Sig. Gen Output Control.V.V.V Normal Indication db min db min db min µv VU min.v.v µv µv VU min VU min VU min VU min Instructions. Continue from stage to stage until an incorrect indication is obtained. The last circuit checked is defective.. If indication is correct, proceed to step.. If indication is correct, proceed to next step.. Continue from stage to stage until an incorrect indication is obtained. The last circuit checked is defective.. If all indications are correct, proceed to next step. µv VU min. If indication is correct, proceed to next step.. If indication is not correct, the trouble is probably in the circuit of V. See paragraph... July Page - Chapter Troubleshooting

26 The st Century R-A/URR Reference YK-R Step No. Test Instructions Connect the signal generator to test point E with the frequency still at MHz. Set LM to -, LG to. With the signal generator connected to test point E change the signal generator frequency to MHz. Tune the MEGACYCLE CHANGE control to MHz and adjust the KILOCYCLE CHANGE control for a peak indication on the LEVEL METER. Rotate the MEGACYCLE CHANGE control from thru. MHz. Set LM to +, LG to. Connect the signal generator to E and tune both the receiver and signal generator to MHz peaking the LEVEL METER indication with the KILOCYCLE CHANGE control. Set LM to, LG to Change the signal generator frequency to MHz and adjust for a peak on the LEVEL METER. Set LM to, LG to. Connect the signal generator to E and tune the frequency of the receiver and signal generator to. MHz adjusting the KILOCYCLE CHANGE control for a peak indication on the LEVEL METER. Check at MHz and MHz also. Set LM to, LG to. Sig. Gen Output Control Normal Indication Instructions µv VU min. If indication is correct, proceed to next step.. If indication is not correct the circuit of V is faulty..v VU min. If indication is correct, the fault is probably in the nd crystal oscillator circuit V. See paragraph.. and figure -..V VU min. If indication is correct, proceed to step.. If indication is incorrect, proceed to next step..v VU min. If indication is correct the faulty circuit is probably the st crystal oscillator V. See paragraph....mhz µv MHz µv MHz µv VU min VU min VU min. If indication is incorrect, check the st mixer circuit V.. If indication is correct, proceed to next step.. If indication is incorrect, check the circuit of V, figure -. July Page - Chapter Troubleshooting

27 The st Century R-A/URR Reference YK-R Step No. Test Instructions Connect the signal generator to J on back of receiver, Tune the receiver and signal generator to MHz. Set LM to -, LG to. Set FUNCTION switch to AGC position. With the signal generator connected as in previous step, observe indication of CARRIER LEVEL meter. With the signal generator set up as in previous step, connect Oscilloscope AN/USM( ) to IF OUTPUT jack on rear panel. Observe khz waveform. Disconnect oscilloscope, and connect Multi-meter AN/PSM( ) to TB-. Observe indication. Sig. Gen Output Control Normal Indication Instructions µv vu min. If indication is correct, proceed to next step. µv µv min ±. If indication is incorrect, check antenna input circuits.. If indication is normal, proceed to step.. If indication is abnormal, proceed to next step. µv mv min. If indication is normal, proceed with next step. µv mv -. VDC min -. VDC min. If indication is abnormal, check the circuit of VB.. If indication is normal, trouble is in circuit of VA.. If indication is abnormal, trouble is in circuits of V or VA. Disconnect signal generator. Set FUNCTION switch to CALIBRATE position and BFO switch to ON. Turn RF GAIN to, and tune receiver to a multiple of khz. Adjust ANT TRIM for max indication on CARRIER LEVEL meter. N/A db min. If indication is normal, the receiver is operating properly.. If indication is abnormal, proceed to next step. Connect Oscilloscope AN/ USM-( ) to pin grid of VB and observe khz waveform. N/A V p-p min. If indication is normal, check circuit of VB.. If indication is abnormal, proceed to next step. Remove V from its socket and connect oscilloscope to pin grid of V socket. Observe khz waveform. N/A.V p-p min. If indication is normal, check circuit of V.. If indication is abnormal, check circuit of VA. July Page - Chapter Troubleshooting

28 The st Century R-A/URR Reference YK-R.. DC Resistances of Transformers and Coils. The dc resistances of the windings of the transformers and coils in Radio Receiver R-A/URR as measured with Multi-meter AN/PSM-( ) are listed in table -. Table - - Transformer and Coil Resistances R-F Sub-chassis Transformer Terminals Ohms Coil Terminals Ohms HR - Z- -. L - Z- -. L -. Z- -. L -. Z- -. L -. Z- -. L -. Z-l - Less than. L -. Z- -. L -. Z- -. L - Z- -. L - Z- -. L. Z- -. L Z- - Less than. L. Z- - Less than. T - - T - - T - - T - - T - - T T - - Less than.. Less than.. Less than.. Less than. Less than. Less than.. Less than. Less than. Z- - Less than. Z- - Less than. Z- -. Z- -. Z- -. July Page - Chapter Troubleshooting

29 The st Century R-A/URR Reference YK-R Main Frame IF Sub-chassis Transformer or Coil FL Terminals Ohms Transformer or Coil Terminals A-A Less than. FL - - B-B Less than. Kl - FL - - FL - - FL - - Ohms L L L L Crystal-Oscillator Sub-chassis RT - HR Gnd. J- pin E T - - L T - - L. T T - - Less than. Less than.... Z -. Z Z -... AF Sub-chassis VFO Sub-chassis Transformer Terminals Ohms Transformer Terminals Ohms or Coil or Coil FL L. K -. Z - -. L - L - L - T T July Page - Chapter Troubleshooting

30 The st Century R-A/URR Reference YK-R.. Resistance Measurements at Sub-chassis Connectors. Connectors are used in this receiver to interconnect the various sub-chassis. Defects may be localized by measurement of the resistance to ground at the receptacle terminals of a sub-chassis. The charts below indicate the normal resistance between the indicated receptacle terminals and chassis ground. To prepare the receiver for these measurements, disconnect the receiver from the power source and remove the connectors from the sub-chassis suspected to be faulty. Table - - Connector Resistance Measurements RF Sub-chassis Crystal Oscillator Sub-chassis Terminal of Receptacle J Resistance to Ground (ohms) Terminal of Receptacle J A k A Inf. B. B C Inf. C Inf. D Inf. D E.M E F F H H J K Inf. Inf. Resistance to Ground (ohms) IF Sub-chassis Terminal of Receptacle J Resistance to Ground (ohms) Terminal of Receptacle J Resistance to Ground (ohms) Infinity ( ) Infinity ( ) k k Infinity ( ) k to Infinity ( ) k Infinity ( ) k Infinity ( ) Infinity ( ) Infinity ( ) Infinity ( ) k. July Page - Chapter Troubleshooting

31 The st Century R-A/URR Reference YK-R Table - - Connector Resistance Measurements - Continued AF Sub-chassis Terminal of Receptacle J Resistance to Ground (ohms) Terminal of Receptacle J Resistance of Ground (ohms). Infinity ( ) k k k Infinity ( ) k k k Infinity ( ) Infinity ( ) Infinity ( ) Infinity ( ) Infinity ( ) Infinity ( ) Less than. Infinity ( ) Infinity ( ) Infinity ( ).M Infinity ( ) VFO Sub-chassis Power Supply Sub-chassis Terminal of Receptacle J Resistance to Ground Terminal of Receptacle J Resistance to Ground A Infinity ( ) Less than. B Infinity ( ) C Infinity ( ) Infinity ( ) D Infinity ( ) Infinity ( ) E Infinity ( ) Infinity ( ) F Infinity ( ) H. Infinity ( ) J Infinity ( ) Infinity ( ) K Infinity ( ) Infinity ( ) Less than. July Page - Chapter Troubleshooting

32 The st Century R-A/URR Reference YK-R POWER CORD C B A F AMP NOTE S PART OF FUNCTION J FL P J TB POWER SUPPLY SUBCHASSIS T TB WIRED FOR VAC POWER SUPPLY SUBCHASSIS T WIRED FOR VAC. VAC RECT V RECT V NOTE. VAC. VAC RECT V RECT V NOTE + VDC J + VDC. VAC J P FUNCTION NOTE SEE FIGURE - FILAMENT AND OVEN CKTS TO ASSOCIATED TRANSMITTER CAL OFF F / AMP BREAK-IN TB ON STANDBY OFF + VDC BLU STANDBY FRONT S YEL RED YEL K VDC CR S BREAK-IN. VAC OFF F / AMP P AF SUBCHASSIS J NOTE K BREAK- IN RELAY + VDC L FILTER C RF-IF B+ LINE L FILTER L FILTER CB AF B+ LINE + VDC V -, V -, V -, V -, R CC R R OFF AGC REAR S E BFO S ON V -, V -, + VDC + VDC V -, J P V -, V -, VA - V -, V -, V -, VB - V - IF SUBCHASSIS V - V - V - V -, V -, V - RF SUBCHASSIS SWITCHED RF/IF B+ LINE J CAL A J K D + VDC P CAL OSC B+ LINE + VDC + VDC + REG RF/IF B+ LINE P J NOTES: R SHORTING LINE + VDC REGULATED VOLTAGE REGULATOR V. FC CHANGES RECTIFIERS V AND V TO CR AND CR.. FUNCTION SWITCH S SHOWN IN OFF POSITION.. SEE TABLE - FOR ALTERNATE FUSES. V - C + REG, REFER TO EIB. V - CRYSTAL OSC SUBCHASSIS J + VDC A P V - B + REG DWG BY KHGRT V - VFO SUBCHASSIS J A P + VDC Figure - Power Distribution Diagram Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

33 The st Century R-A/URR Reference YK-R PART OF T IF SUBCHASSIS C. ST IF AMPL V /BAW AGC IF AMPL V /BAW TO TERMINAL OF BREAK-IN RELAY K. VAC AMP TO ANTENA RELAY K. VAC. AMP POWER SUPPLY SUBCHASSIS RD IF AMPL V /BAW BFO V /BAW RED CURRENT REGULATOR RT ND IF AMPL V /BAW TH IF AMPL V AK AGC TIME CONSTANT AND DET V A AGC RECT AND IF CATHODE FOLLOW ER V A YEL J RECTIFIER RECTIFIER V V ZW ZW NOTE: V AND V CHANGED TO SILICON DIODES IN FIELD CHANGE., LIMITER V A R, J + BLU CR _ P J, J P P P YEL. VAC OFF. VAC SWITCHED I I DIAL LIGHTS #. VAC S OVENS ON. VAC R. P F P B P J J J RF AMPL V DC L L ST MIXER V C UH UH ND MIXER V C ST CRYSTAL OSC V /AKW C L. UH AF SUBCHASSIS C L UH C C L UH PART OF CRYSTAL OVEN HR W ST AF AMPL AND AF CATHODE FOLLOW ER V A LINE AF OUTPUT V AK, R C. C L UH C L UH C LOCAL AF OUTPUT V AK LOCAL AF AMPL AND LINE AF AMPL V A RD MIXER V C KHZ MULTIVIBRATOR V A CAL OSC AND KHZ CATHODE FOLLOW ER V A,, RF SUBCHASSIS, VFO V /BAW C VFO SUBCHASSIS L UH C H. VAC SWITCHED. VAC P B E CRYSTAL OSCILLATOR SUBCHASSIS J L UH C nd CRYSTAL OSC V /AKW C C L. UH PART OF OVEN HR W S C DWG BY KHGRT J D E J K P F P D H J P J P J C PART OF OVEN HR S Figure - Filament and Oven Circuits Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

34 The st Century R-A/URR Reference YK-R V AK SHORTING PLUG J J P TO S- FIELD CHANGE NO. SUPPRESSOR GRID CONNECTED TO CATHODE OHM BALANCED J P TO S- TB TB J J A B B A T R R R R R WHIP UNBALANCED J R I K J P FIELD CHANGE NO. (EIB ) ANTENNA INPUT MODIFIED ON SHIPBOARD INSTALLATIONS - USE J AS ANTENNA INPUT JACK. REVERSE CABLES TO J AND J TO S- TB A J B B A C FIELD CHANGE NO. CONVERSION TO OHM SHUNT LOAD FL FIELD CHANGE NO. (EIB ) CONVERSION TO AN TYPE CONNECTORS T TO J- VFO (V) ST CRYSTAL OSC (V) TB J DIODE LOAD FIELD CHANGE NO. (EIB ) PROVIDES FRONT PANEL DIODE TEST JACK CR N CR N TO J- FIELD CHANGE NO. (EIB ) CONVERSION TO SILICON DIODES R K, C FIELD CHANGE NO. CONVERSION OF R AND R R K TO FL TB P J T P J TO FL TB T ELAPSED TIME INDICATOR ELAPSED TIME INDICATOR NOTE: THIS W IRE MOVED FROM TB- TO TB- NOTE: THIS W IRE MOVED FROM TB- TO TB- TO S- TO S- W IRED FOR VAC W IRED FOR VAC FIELD CHANGE NO. PROVIDES ELAPSED TIME INDICATOR Rev: // Figure - Field Changes, Courtesy of Pete Wokoun, KHGRT Table - identifies specific production modifications and associated contract numbers July Page - Chapter Troubleshooting

35 The st Century R-A/URR Reference YK-R BALANCED ANTENNA ( OHM). TO MHZ UNBALANCED ANTENNA (WHIP) FUNCTION S FRONT OFF BREAK-IN TO ASSOCIATED XMTR RF SUBCHASSIS J P J J P. TO MHZ KA J J P S TO MHZ TO MHZ KB TO MHZ TO MHZ. VAC CR STBY, CAL, OFF, AGC, MGC SEE Fig. - S TO MHZ. VAC K ON S TB NOTES:. Primary trimmers CA, CA, CA, CA, CA, and CA. Secondary trimmers CB, CB, CB, CB, CB, and CB. C CAL ADJ MEGACYCLE CHANGE AND / OR KILOCYCLE CHANGE MEGACYCLE CHANGE T T C C. TO MHZ E G RF AMPL V DC P TO MIXER STAGES Fig. - S FRONT T AGC KHZ & HARMONICS K C T C C J P T TB RF GAIN CATHODE BIAS LINE T C C TO J- Fig. - SEE NOTE ANT TRIM S R RF GAIN CALIBRATION OSC VA (/) A P G KHZ MULTIVIBRATOR V A B+ B+ G P K KHZ CATH FOL VB (/) A B+ DWG BY KHGRT J P J FUNCTION S REAR CAL B+ Figure - Signal Flow Diagram, Part of - RF Stage Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

36 The st Century R-A/URR Reference YK-R TO MHZ st MIXER V C T st XTAL OSC V /AKW rd MIXER V C Z-,, nd MIXER V C S nd XTAL OSC V /AKW S FROM RF STAGE Fig - RF SUBCHASSIS Z- Z- Z- Z- S Z- Z- Z- Z- Z- Z- Z- Z- TRIMMERS C-, C-, C-, C-, C-, and C- END POINT ADJ L VFO SUBCHASSIS MEGACYCLE CHANGE T, C MEGACYCLE CHANGE AND / OR KILOCYCLE CHANGE VFO V /BAW P. TO. MHZ P Z. TO. MHZ J. TO MHZ. TO MHZ C-,, E TO MHZ S AGC G K P Z-,,. TO MHZ S FRONT TO MHZ TO MHZ P J TO MHZ L TO MHZ MHZ P TO MHZ Y MHZ SG TRIMMERS C-, C-, C-, C-, C-, AND C- S REAR J P D + VDC REG DWG BY KHGRT L K P KHZ P G P T AGC E TO MHZ C-,,. TO MHZ OR TO MHZ E P G AGC K P J XTAL OSC SUBCHASSIS T L TO MHZ IN STEPS P G PLATE CIRCUIT TRIMMERS CA-H, CA-H, and CA- H Y-Y E J TO IF STAGES Fig. - J Figure - Signal Flow Diagram, Part of - Mixer Stages Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

37 The st Century R-A/URR Reference YK-R J From Mixer Stages Fig. - J From Fig. - J S. BANDWIDTH KC MECHANICAL FILTERS FL KHZ IF SUBCHASSIS C L FL KHZ L L KHZ L L KHZ Z R C G AGC st IF AMPL V /BAW K, P S FRONT FL KHZ FL KHZ. S FRONT AGC G nd IF AMPL P V /BAW K, G rd IF AMPL P V /BAW T K, T AGC R GAIN ADJ CATHODE BIAS LINE K AGC RECT VA (/) A K P AGC TIME CONSTANT VA (/) A G P P, J J C KHZ L P Z AGC IF AMP V /BAW TO V - V & V - V AGC LINE IF CATH FOLLOWER VB (/) A K CARR-METER ADJUST G G K th IF AMPL P V AK K R DETECTOR VB (/) A K P,G, T DETECTED AUDIO KHZ L TO KHZ L L P,G, P G C TO KHZ Z G BFO V /BAW LIMITER V A K, J J J J J J J J SG P,G, L BFO PITCH J P J P S BFO OFF ON SWITCHED B+ TO AUDIO STAGES Fig. - P OFF ON LIMITER R MED SLOW FAST P S P AGC FUNCTION S STANDBY, MGC CR AGC P TB NOR DIV AGC P P P J IF OUTPUT OHM M CARRIER LEVEL P P P TB + DB _ J DIODE LOAD DIODE LOAD P S DWG BY KHGRT Figure - Signal Flow Diagram, Part of - IF Stages Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

38 The st Century R-A/URR Reference YK-R FROM IF STAGES Fig - HZ BP FILTER FL SHARP S AUDIO RESPONSE P P WIDE P J G st AF AMPL VA (/) A G LINE AF AMP VB (/) A J P J G AF CATH FOLLOWER VB (/) A K J J J P P P LINE GAIN R R K BREAK-IN RELAY Fig - R AF SUBCHASSIS P G LINE AF OUTPUT V AK P T J P P VU S LOCAL AF AMP VA (/) A P LOCAL AF OUTPUT V AK G P G T J DWG BY KHGRT LOCAL GAIN TB M LINE LEVEL OFF +//- SHUNTS AND DIVIDERS LINE METER P R LINE AUDIO TB LOCAL AUDIO PHNS J PHONES Figure - Signal Flow Diagram, Part of - Audio Stages Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

39 The st Century R-A/URR Reference YK-R NOTE J P J OHM BALANCED J P KA ANTENNA KB WHIP UNBALANCED J I R K J AD TO CR Fig. - P RED AE TO CR Fig. - BLU NOTES:. ANTENNA, RF, AND VARIABLE IF COILS ARE TUNED AS FOLLOWS: CONTINUOUSLY WITH KILOCYCLE CHANGE: ALL COILS. INTERMITTENTLY WITH MEGACYCLE CHANGE: T THRU T, Z- THRU Z-, Z- THRU Z-, & Z- THRU Z-.. SCHEMATIC SHOWN WITH MEGACYCLE CHANGESET FOR THE. TO MHZ BAND.. REFER TO TABLE -, PRODUCTION MODS.. REFER TO TABLE -, FIELD CHANGE DATA, AND FIGURE -.. REFER TO TABLE - FOR FUSE DATA.. = INTRACHASSIS CONN. = INTERCHASSIS CONN. RF SUBCHASSIS.- MHZ - MHZ - MHZ S - MHZ - MHZ - MHZ S CA - C L CA - C L CA - C L CA - C L CA - C L CA - C L T. TO MHZ CB - L T TO MHZ CB - L T TO MHZ CB - L T TO MHZ CB - L T TO MHZ CB - L T TO MHZ CB.- L C C C C C C C C C C C C R.M C R K S FRONT S S FRONT ANT TRIM MEGACYCLE CHANGE AND/OR KILOCYCLE CHANGE NOTE MEGACYCLE CHANGE NOTE S REAR A TO st MIXER Fig. - E NOTE E E R K C NOTE RF AMPLIFIER V DC C C NOTE C. S REAR KHZ MARKERS R R K C R K + VDC CA - AGC LINE ND MIXER Fig. - C B B - TO CALIBRATION OSCILLATOR Fig. - C J P C TB- Fig - P CATHODE BIAS LINE SWITCHED RF-IF B+ LINE Fig - D DWG BY KHGRT Figure - Schematic Diagram, Part of - RF Amplifier Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

40 The st Century R-A/URR Reference YK-R S A FROM RF AMPLIFIER STAGE Sheet RF SUBCHASSIS. TO MHZ TO MHZ TO MHZ TO MHZ TO MHZ TO MHZ L- L- L- L- L- L- Z- C C- - C- C- C- () NOTE Sheet L- Z- C C- - C- C- C- L- Z- C C- - C- C- L- C- - Z- C C- C- L- C- - Z- C- C- C L- Z- C C- - C- C- C L- Z- C- - C- C- C- () NOTE Sheet Z- C- - C- C- C- Z- C- - C- C- Z- C- - C- C- Z- C- - C- C- Z- C- - C- C- B AGC LINE RF AMPLIFIER Sheet. TO MHZ C C TO MHZ TO MHZ S C C TO MHZ C TO MHZ C TO MHZ C L. MH MEGACYCLE CHANGE NOTE, Sheet MEGACYCLE CHANGE AND/OR KILOCYCLE CHANGE NOTE, Sheet NOTE, Sheet Z- E ST MIXER V C C C. C- - L- R C R.K C C R.K C C. Z- C- - Z- L- R M P J C C- - R K C R.K + VDC L- SWITCHED RF-IF B+ LINE Sheet OUTPUT TO ND MIXER Sheet B F PART OF HR Y MHZ C R K L C C T L, S FRONT C L. MH C R.K R K ST CRYSTAL OSCILLATOR V /AKW S REAR C (.) NOTE, Fig. - C J J (K) Note, Fig. - P D K P J P H REGULATED + V LINE Sheet RF-IF B+ LINE Sheet + VDC W AGC LINE ND MIXER Sheet E DWG BY KHGRT H Figure - Part of - st Mixer and st Crystal Oscillator July Page - Chapter Troubleshooting

41 The st Century R-A/URR Reference YK-R B RF SUBCHASSIS FROM ST MIXER STAGE Fig. - C R M E ND MIXER V C R C E AGC LINE ST MIXER Fig. - R K C R.K C D SWITCHED RF-IF B+ LINE Fig. - R.K F SWITCHED RF-IF B+ LINE Fig. - R AGC LINE TB- Fig. - P E J R K SWITCHED RF-IF B+ LINE P- Fig. - A P J L. MH N R C. NOTE, Fig. - PART OF CRYSTAL OVEN HR R K C. L UH W Y KHZ C R K C C R K C R K J C.-. R K CALIBRATION OSCILLATOR VA (/) A C F P. VAC Fig. - AH Z- C C- - C- L- Z- C C- C- - L- Z- C- C- - L- C R K R M C C R.K C L. MH C R K KHZ CATHODE FOLLOWER VB (/) A KHZ MULTIVIBRATOR V A TO RF AMP Fig. - KHZ MARKERS L. UH R + VDC J P J KILOCYCLE CHANGE NOTE, Fig. - T E RD MIXER V C C TO J IF SUBCHASSIS Fig. - AF R R.K C R.K L L C TO J IF SUBCHASSIS Fig. - AG J P VFO SUBCHASSIS END POINT ADJ L L OVEN HR C C C L. UH C SEALED UNIT VFO V /BAW R K C C R K (K) FC NO. NOTE R.K C.- Z T C C R C C W S C + VDC J J K D E F C B A DWG BY KHGRT P SPARE CAL OSCILLATOR B+ LINE S - (R) Fig. - TO J ND CRYSTAL OSC SUBCHASSIS Fig. - M G. VAC OVEN LINE Fig. - U REGULATED + V LINE Fig. - J RF-IF B+ LINE Fig. - AA Figure - Schematic Diagram, Part of - nd Mixer and VFO Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

42 The st Century R-A/URR Reference YK-R CRYSTAL OSCILLATOR SUBCHASSIS MEGACYCLE CHANGE NOTE, Fig. - Y Y MHZ MHZ Y MHZ C Y Y Y Y Y Y MHZ C. MHZ Y MHZ Y. MHZ Y. MHZ. MHZ MHZ MHZ MHZ S ND CRYSTAL OSCILLATOR V /AKW L T Y Y. MHZ Y. MHZ C MHZ R K C E C, C L. MH R.K C C HR C R K R.K C S C + VDC J J P P C J J J J E D P H P F C P P A. VAC OVEN LINE Fig. - V REGULATED + V LINE Fig. - K RF-IF B+ LINE Fig. - AB L J P CRYSTAL OSCILLATOR OUTPUT TO ND MIXER Fig. - G S CG CG CG CE CE - C H - C H - C H - CF - CF CE CC CD CC CD CC CD CA CB CA CB CA - CF - C - C - C - C - C - C - C - C - C - C - C CB - C - DWG BY KHGRT Figure - Schematic Diagram, Part of - nd Crystal Oscillator Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

43 The st Century R-A/URR Reference YK-R AF AGC S Y P FROM RF SUBCHASSIS AG P Y KHZ R K C SLOW FAST J- SHEET MED J J C - C C R K AGC TIME CONSTANT VA (/) A J C. R STBY BANDWIDTH C S Z L C R R C. R () NOTE, Sheet C. L UH S FRONT L MH ST IF AMP V /BAW R K C. C R K C R.K MGC R.M R K KC R/R SELECTED FOR OPTIMUM BANDPASS STBY. AGC LINE OFF S FRONT CAL R K R K C AGC RECTIFIER VA (/) A S REAR C NOTE C NOTE C NOTE C NOTE FL KC FL KC FL KC FL KC SWITCHED RF/IF B+ LINE CATHODE BIAS LINE C C. R.K Z L C R K C. AGC IF AMP V / BAW C. R R M S FRONT R K R C NOTE C NOTE C NOTE C NOTE C. R K C R C C C IF CATHODE FOLLOWER VB (/) A L UH S REAR C. R TH IF AMP V AK C. C.- R CARR-METER ADJUST ND IF AMP V /BAW T L C R R K C R K R R.K C BFO NEUTRALIZING CAP L R C R.K C. T L C L R K C L MH C C R K C. C R K DETECTOR VB (/) A RD IF AMP V /BAW P M CARRIER P P P LEVEL P P P P P CR FUNCTION J TB DIV AGC NOR SHOWN IN OFF POSITION CATHODE BIAS LINE RF GAIN AGC LINE + J-E SHEET R C MFD R K RF GAIN + J-C SHEET P MECHANICAL FILTERS NOTE P J J J IF OUTPUT OHM CAL OSCILLATOR B+ LINE M SHEET T + J- SHEET REGULATED + VDC SHEET L DB - + CAL S REAR + AGC STBY OFF J C W R J R SWITCHED RF/ IF B+ LINE SHEET N RF/IF B+ LINE SHEET + R SHORTING LINE SHEET AC X OFF + BFO S J ON J DIODE LOAD (FRONT PANEL) FC NO. NOTE R GAIN ADJ R.K J CW R K C. C. R K To J-- AF Subchassis, Sheet C. R K C C BFO V / BAW R K LIMITER VB (/) A R K TB R K R K C C C DIODE LOAD GND R R K J S C L C R.K R K C C OFF, T R K IF SUBCHASSIS Z L C. C L C BFO PITCH C. C. LIMITER VA (/) A J R L P R K CW TO J- AF SUBCHASSIS SHEET S LIMITER DWG BY KHGRT R K Figure - Schematic Diagram, Part of - IF Amplifiers, AGC, Limiter and Detector Courtesy of Pete Wokoun, KHGRT July Page - Chapter Troubleshooting

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