SRF-M75PM SERVICE MANUAL FM STEREO/AM PLL SYNTHESIZED RADIO. US Model Canadian Model AEP Model E Model Australian Model. Ver

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1 SRF-M75PM SERVICE MANUAL Ver US Model Canadian Model AEP Model E Model Australian Model SPECIFICATIONS US, Canadian, and E models AEP, Australian models FM STEREO/AM PLL SYNTHESIZED RADIO MICROFILM

2 SECTION 1 SERVICING NOTES TABLE OF CONTENTS 1. SERVICING NOTES GENERAL DISASSEMBLY ELECTRICAL ADJUSTMENTS TUNER Section... 6 PULSE MONITOR Section DIAGRAMS 5-1. Block Diagram Printed Wiring Boards Schematic Diagram IC Pin Function Description Forced Reset The system microprocessor can be reset in the following procedure. Use these procedure when the unit cannot be worked normally due to the overrunning of the microprocessor, etc. Procedure: 1. Set to radio OFF. 2. While pressing the [SCAN] button, press two buttons of [START/STOP] and [BAND] simultaneously for 5 seconds. 3. The unit is reset, and display blinking AM 12:00. Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be damaged by heat. 6. EXPLODED VIEW ELECTRICAL PARTS LIST

3 SECTION 2 GENERAL This section is extracted from instruction manual. US, Canadian, and E models AEP, Australian models 3

4 SECTION 3 DISASSEMBLY This set can be disassembled in the order shown below. Set Cabinet (Front) Assy Cabinet (Rear) Assy Key Board Main Board Knob (A) Note: Follow the disassembly procedure in the numerical order given. CABINET (FRONT)/(REAR) ASSY 2 three screws (B1.7 8) 1 Remove the battery case lid of the arrow. 2 two screws (B1.7 8) 4 cabinet (rear) assy 3 cabinet (front) assy KEY BOARD 1 three claws 2 Open the key board to direction of the arrow. 1 four claws 4

5 MAIN BOARD Note: Check that two switch (S1, S2) is latched with two adaptors when carrying out installation. 3 knob (vol) 5 main board 4 two claws S2 S1 2 screw (B1.7 8) 1 Remove two solders. KNOB (A) 2 two knobs (A) 1 claw 1 claw 3 two adaptors 5

6 SECTION 4 ELECTRICAL ADJUSTMENTS TUNER SECTION 0 db=1 µv [AM] Setting: Band switch: AM AM RF signal generator [FM] Setting: Band switch: FM FM RF signal generator 22.5 khz frequency deviation by 400 Hz signal Output level: as low as possible Repeat the procedures in each adjustment several times, and the tracking adjustments should be finally done by the trimmer capacitors. MAIN board TP (VT) Put the lead-wire antenna close to the set µf Adjustment Location: Main Board (See page 7) + set 30% amplitude modulation by 400 Hz signal Output level: as low as possible MAIN board TP (FM IN) set digital voltmeter 32 Ω 2 jack (J1) 32 Ω 2 jack (J1) level meter + level meter + T1 AM IF ADJUSTMENT Adjust for a maximum reading on level meter 450 khz AM VCO VOLTAGE ADJUSTMENT Adjustment Part Frequency Display Reading on Digital Voltmeter L4 530 khz (531 khz) 3 ± 0.1V Confirmation 1710 khz (1602 khz) 9 ± 1V (8.5 ± 1V) L1 CT1 AM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter 580 khz (621 khz) 1,490 khz (1,395 khz) FM VCO VOLTAGE CONFIRMATION Frequency Display Reading on Digital Voltmeter 87.5 MHz 3 ± 0.3V 108 MHz Less than 11 ± 1V FM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter L MHz CT2 108 MHz ( ): Except US model FM Free-Run Adjustment Setting: FM RF signal generator 0.01 µf Carrier frequency : 98 MHz Modulation : no modulation Output level : 0.1 V (100 db) MAIN board TP (FM IN) Procedure: 1. Connect the frequency counter to TP (MPX) as shown the figure below. 2. Tune the set to 98 MHz. 3. Adjust RT1 for 76 khz reading on the frequency counter. set Specification: 75.8 to 76.2 khz frequency counter 1 µf MAIN board TP (MPX) + + Adjustment Location: MAIN board (See page 7) 6

7 Adjustment Location: MAIN BOARD (Component Side) MAIN BOARD (Conductor Side) L4 AM VCO Voltage Adjustment RT1 FM Free-Run Adjustment TP (MPX) CT1 AM Tracking Adjustment L1 AM Tracking Adjustment CT2 L2 FM Tracking Adjustment TP (VT) TP (FM IN) J1 T1 AM IF Adjustment 7

8 PULSE MONITOR SECTION Luminance Adjustment digital voltmeter KEY board TP (LED) + Procedure: 1. Connect the digital voltmeter to TP (LED) on the KEY board. 2. Press the [PULSE] button (S112) to enter pulse monitor mode. 3. Adjust RT102 for 0.24 V reading on the digital voltmeter. Specification: 0.22 to 0.26 V Adjustment Location: KEY BOARD (Component Side) KEY BOARD (Conductor Side) RT102 Luminance Adjustment TP (LED) 8

9 SECTION 5 DIAGRAMS SRF-M75PM 5-1. BLOCK DIAGRAM CF1 10.7MHz VREF B+ S1 FM SENS DX LOCAL (PANAMA) L1 AM FERRITE-ROD ANTENNA CT1, L1 AM TRACKING CT1 B.P.F. BPF1 CT2, L2 FM TRACKING D1-1 L2 FM RF CT2 D FM/AM FRONT-END, FM/AM DET, MPX IC1 FM RF IN FM RF AM RF IN L4 AM VCO VOLTAGE FM FRONT-END AM FRONT-END AM OSC FM OSC FM/AM MIX OUT CF3: EXCEPT PANAMA CF4, 5: PANAMA 10.7MHz T1 AM IF CF2 450kHz AM IF BUFFER Q4, 5 14 FM IF IN AM IF IN FM DISCRI BAND SELECT FM IF AMP/ DISCRI TUNING INDICATOR AM IF AMP/ DET TUNE IND 12 AFC1/AGC REG 9 21 PILOT DET LPF2 REGULATOR PD1 PD2 3 PILOT DET LPF1 2 VCC 7 1/2 COUNTER 1/2 COUNTER PLL LPF1 1 DECODER AMP SWITCH L.P.F. PLL LPF2 VCO 29 L-CH OUT R-CH OUT ST IND VCO IN1 IN2 BASS BOOST AMP IC2 BASS BOOST CONTROL DET IN DET 12 OUT1 OUT2 LP GAIN ON OFF RV1 VOL 1 2 S2 MEGA BASS 2 4 IN1 IN2 HEADPHONE AMP IC3 POWER AMP POWER AMP MUTE CONTROL MT/SW 10 OUT1 OUT2 9 7 L4 AM OSC D1-2 D3 L3 FM OSC FM/AM BAND SELECT SWITCH Q3 B+ RT1 FM FREE-RUN + LOW-PASS FILTER Q101 FM VCO BUFFER Q COMPARATOR IC4 (1/2) COMPARATOR IC4 (2/2) 7 1 J1 2 (HEADPHONE) EO KS0 KS3 VCOL KR0 KR3 DATA VCOH CK CS PULSE IN XOUT XIN AM IF IN BAND COM0 COM3 SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER, KEY CONTROL IC101 SEG0 SEG14 PULSE POWER POWER IF ON CMP IN MUTE CE BEEP X101 75kHz LIQUID CRYSTAL DISPLAY LCD101 VOLTAGE DETECT IC102 KEY MATRIX S DI 4 DO EEPROM IC SK CS SYSTEM CONTROLLER (IC101), EEPROM (IC105) B+ FM/AM TUNER (IC1), HEADPHONE AMP (IC3) B+ BASS BOOST AMP (IC2) B+ RIPPLE FILTER Q2 DRY BATTERY SIZE AAA (IEC DESIGNATION R03) 2PCS. 3V B+ PLL LOW-PASS FILTER CIRCUIT B+ D105 DC/DC CONVERTER Q103, T101 B+ SWITCH Q104 PC101 PULSE (PULSE METER SENSOR) PULSE METER COMPARATOR IC103 BUFFER Q105, 106 AM IF AMP CIRCUIT B+ B+ SWITCH Q6 RT SIGNAL PATH : FM : AM LUMINANCE PULSE METER CIRCUIT B+ REGULATOR IC104 B+ SWITCH Q

11 5-3. SCHEMATIC DIAGRAM See page 19 for IC Block Diagrams. SRF-M75PM Waveforms KEY Board 1 XOUT 200 mv/div, 10 µs/div 208 m Vp-p 13.3 µs 2 Q103 Base-1, Collector-2 (RADIO ON mode) 200 mv/div, 100 ns/div 616 m Vp-p 243 ns 3 Q103 Collector-1 (RADIO ON mode) 2 V/DIV, 100 ns/div 4.9 Vp-p Note on Schematic Diagram: All capacitors are in µf unless otherwise noted. pf: µµf 50 WV or less are not indicated except for electrolytics and tantalums. All resistors are in Ω and 1 /4 W or less unless otherwise specified. : internal component. C : panel designation. U : B+ Line. H : adjustment for repair. Power voltage is dc 3 V and fed with regulated dc power supply from battery terminal. Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : FM ( ) : AM [ ] : PULSE : Impossible to measure Voltages are taken with a VOM (Input impedance 10 MΩ). Voltage variations may be noted due to normal production tolerances. Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances. Circled numbers refer to waveforms. Signal path. F : FM f : AM 243 ns

16 KEY MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark <TRANSISTOR> Q TRANSISTOR XN6501 Q TRANSISTOR XN4608 Q TRANSISTOR XN6501 Q TRANSISTOR XN4608 Q TRANSISTOR 2SC1623-L5L6 Q TRANSISTOR 2SC1623-L5L6 <RESISTOR> R RES, CHIP 4.7K 5% 1/10W R RES, CHIP 47K 5% 1/10W R RES, CHIP 47K 5% 1/10W R RES, CHIP 47K 5% 1/10W R RES, CHIP 100K 5% 1/10W R RES, CHIP 10K 5% 1/16W R RES, CHIP 10K 5% 1/16W R RES, CHIP 10K 5% 1/16W R METAL CHIP 100K 5% 1/16W R RES, CHIP 1K 5% 1/10W R RES, CHIP 1K 5% 1/10W R METAL CHIP 1K 5% 1/16W R METAL CHIP 1K 5% 1/16W R METAL CHIP 100K 5% 1/16W R METAL CHIP 22K 5% 1/16W R METAL CHIP 220K 5% 1/16W <VARIABLERESISTOR > RT RES, ADJ, CARBON 220 R METAL CHIP 1K 5% 1/16W R METAL CHIP 1K 5% 1/16W R METAL CHIP 1K 5% 1/16W R METAL CHIP 1K 5% 1/16W R RES, CHIP 10K 5% 1/16W R RES, CHIP 10K 5% 1/16W R RES, CHIP 10K 5% 1/16W R RES, CHIP 10K 5% 1/16W R RES, CHIP 10K 5% 1/16W R RES, CHIP 1K 5% 1/10W R METAL CHIP 10K 5% 1/16W R RES, CHIP 10K 5% 1/16W R METAL CHIP 330K 5% 1/10W R RES, CHIP 10K 5% 1/16W R METAL CHIP 100K 5% 1/16W R RES, CHIP 10K 5% 1/16W R METAL CHIP 100K 5% 1/16W R METAL CHIP 3.3K 5% 1/16W R RES, CHIP 1K 5% 1/10W R RES, CHIP 100K 5% 1/10W R RES, CHIP 100K 5% 1/10W R RES, CHIP 47K 5% 1/10W R RES, CHIP 47 5% 1/10W R METAL CHIP 2.2K 5% 1/16W R METAL CHIP 100K 5% 1/16W R RES, CHIP 10K 5% 1/16W R METAL CHIP 1K 5% 1/16W R METAL CHIP 47 5% 1/16W R METAL CHIP 270 5% 1/16W R METAL CHIP 1K 5% 1/16W R METAL CHIP 1M 5% 1/16W R METAL CHIP 0 5% 1/16W R METAL CHIP 470K 5% 1/16W R METAL CHIP 100K 5% 1/16W R METAL CHIP 100K 5% 1/16W R METAL CHIP 2.2K 5% 1/16W R METAL CHIP 2.2K 5% 1/16W R METAL CHIP 22K 5% 1/16W R METAL CHIP 47K 5% 1/16W R RES, CHIP 10K 5% 1/16W R METAL CHIP 47K 5% 1/16W R METAL CHIP 47K 5% 1/16W R RES, CHIP 10K 5% 1/16W <SWITCH> S SWITCH, TACTIL (POWER) S SWITCH, TACTIL (HOLD) S SWITCH, TACTIL (START/STOP) S SWITCH, TACTIL (LAP/RESET) <TRANSFORMER> T TRANSFORMER, DC-DC CONVERTER <VIBRATOR> X VIBRATOR, CRYSTAL (75kHz) ************************************************************** * A A MAIN BOARD, COMPLETE (EXCEPT Panama) * A A MAIN BOARD, COMPLETE (Panama) ********************* HOLDER (BAR ANT) < BAND PASS FILTER > BPF FILTER, BAND PASS < CAPACITOR > C CERAMIC CHIP 0.001uF 5% 50V C CERAMIC CHIP 0.001uF 5% 50V C CERAMIC CHIP 9PF 0.25PF 50V C CERAMIC CHIP 3PF 0.25PF 50V C CERAMIC CHIP 0.047uF 10% 25V C CERAMIC CHIP 390PF 5% 50V C CERAMIC CHIP 15PF 5% 50V C CERAMIC CHIP 100PF 5% 50V C CERAMIC CHIP 0.01uF 10% 50V C ELECT 10uF 20% 16V C ELECT 10uF 20% 16V C ELECT 3.3uF 20% 50V C CERAMIC CHIP 0.47uF 10V C TANTALUM CHIP 4.7uF 20% 6.3V C CERAMIC CHIP 0.01uF 10% 25V C CERAMIC CHIP 0.1uF 25V C TANTALUM CHIP 10uF 20% 6.3V C CERAMIC CHIP 1uF 16V C TANTALUM CHIP 4.7uF 20% 6.3V C ELECT 100uF 20% 10V 23

17 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C CERAMIC CHIP 0.1uF 10% 25V C CERAMIC CHIP 0.022uF 10% 25V C CERAMIC CHIP 0.022uF 10% 25V C CERAMIC CHIP 1uF 16V C CERAMIC CHIP 0.33uF 25V C CERAMIC CHIP 0.33uF 25V C CERAMIC CHIP 0.01uF 10% 50V C CERAMIC CHIP 0.1uF 10% 25V C CERAMIC CHIP 0.047uF 10% 25V C TANTALUM CHIP 3.3uF 20% 6.3V < DIODE > D DIODE SVC347S-TL D DIODE 1T362 D DIODE 1T362 < IC > IC IC CXA1238M-T6 IC IC LA3550MTP-1 IC IC LA4533M IC IC BA10393F-E2 C ELECT 3.3uF 20% 50V C ELECT 10uF 20% 16V C CERAMIC CHIP 0.33uF 25V C CERAMIC CHIP 0.33uF 25V C CERAMIC CHIP 12PF 5% 50V C CERAMIC CHIP 0.001uF 10% 50V C TANTALUM CHIP 100uF 20% 6.3V C CERAMIC CHIP 100PF 5% 50V C CERAMIC CHIP 100PF 5% 50V C TANTALUM CHIP 100uF 20% 4V C ELECT 220uF 20% 4V C CERAMIC CHIP 0.1uF 10% 25V C CERAMIC CHIP 0.1uF 10% 25V C ELECT 100uF 20% 10V C ELECT 100uF 20% 10V C CERAMIC CHIP 0.01uF 10% 50V C CERAMIC CHIP 0.01uF 10% 25V C CERAMIC CHIP 0.01uF 10% 50V C CERAMIC CHIP 0.01uF 10% 25V C CERAMIC CHIP 0.01uF 10% 25V C TANTALUM CHIP 10uF 20% 6.3V C ELECT 470uF 20% 4V C ELECT 470uF 20% 4V C CERAMIC CHIP 0.001uF 10% 50V C CERAMIC CHIP 0.1uF 10% 25V C CERAMIC CHIP 0.01uF 10% 50V C CERAMIC CHIP 100PF 5% 50V C CERAMIC CHIP 100PF 5% 50V C CERAMIC CHIP 100PF 5% 50V C CERAMIC CHIP 100PF 5% 50V C CERAMIC CHIP 100PF 5% 50V C CERAMIC CHIP 0.01uF 10% 25V C CERAMIC CHIP 0.01uF 10% 50V C CERAMIC CHIP 0.1uF 10% 25V < FILTER > CF FILTER, CERAMIC CF FILTER, CERAMIC CF FILTER, CERAMIC (EXCEPT Panama) CF FILTER, CERAMIC (Panama) CF FILTER, CERAMIC (Panama) < TRIMMER > CT CAP, TRIMMER 10PF CT CAP, TRIMMER 10PF < JACK > J JACK (SMALL TYPE) (DIA. 3.5) (2) < SHORT > JC SHORT 0 (Panama) < COIL > L ANTENNA, FERRITE-ROD (AM) L COIL, AIR-CORE L INDUCTOR 82nH L COIL (OSC) L INDUCTOR 4.7uH L INDUCTOR 4.7uH L INDUCTOR 4.7uH L INDUCTOR 47uH < TRANSISTOR > Q TRANSISTOR 2SC2223-F13 Q TRANSISTOR 2SC1623-L5L6 Q TRANSISTOR 2SC4081-R Q TRANSISTOR 2SC4081-R Q TRANSISTOR 2SC4081-R Q TRANSISTOR 2SB624-BV345 < RESISTOR > R RES, CHIP 100K 5% 1/10W R RES, CHIP 100K 5% 1/10W R METAL CHIP 10K 5% 1/10W R METAL CHIP 2.2K 5% 1/10W R METAL CHIP 22K 5% 1/16W R RES, CHIP 1M 5% 1/10W R METAL CHIP 220 5% 1/16W R METAL CHIP 1K 5% 1/16W R METAL CHIP 8.2K 5% 1/16W R METAL CHIP 3.3K 5% 1/16W R METAL CHIP 220K 5% 1/16W R METAL CHIP 2.2K 5% 1/16W R METAL CHIP 220 5% 1/10W R METAL CHIP 10 5% 1/10W R METAL CHIP 3.3K 5% 1/16W R METAL CHIP 3.3K 5% 1/16W R METAL CHIP 220K 5% 1/16W R RES, CHIP 4.7K 5% 1/10W R METAL CHIP 150K 5% 1/10W R METAL CHIP 150K 5% 1/10W 24

18 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R METAL CHIP 100K 5% 1/16W R METAL CHIP 1K 5% 1/16W R RES, CHIP 10K 5% 1/16W R RES, CHIP 10K 5% 1/16W R METAL CHIP 1K 5% 1/16W R METAL CHIP 1K 5% 1/16W R METAL CHIP 10K 5% 1/10W R METAL CHIP 10K 5% 1/10W R RES, CHIP 68K 5% 1/10W R METAL CHIP 2.2K 5% 1/16W R METAL CHIP 2.2K 5% 1/16W R METAL CHIP 100K 5% 1/16W R METAL CHIP 2.2K 5% 1/16W R METAL CHIP 100 5% 1/16W R METAL CHIP 100K 5% 1/16W R METAL CHIP 470 5% 1/16W R METAL CHIP 47 5% 1/16W R METAL CHIP 100 5% 1/16W R METAL CHIP 10 5% 1/16W R RES, CHIP 100K 5% 1/10W R METAL CHIP 82K 5% 1/10W R METAL CHIP 100K 5% 1/16W R METAL CHIP 100K 5% 1/16W < VARIABLE RESISTOR > RT RES, ADJ, CARBON 4.7K RV RES, BAR, CARBON 20K/20K (VOL) < SWITCH > S SWITCH, SLIDE (FM SENS) S SWITCH, SLIDE (MEGA BASS) < TRANSFORMER > T TRANSFORMER, IF ************************************************************** MISCELLANEOUS ************** SWITCH, RUBBER KEY ************************************************************** ACCESSORIES & PACKING MATERIALS ******************************** STRAP, HAND MANUAL, INSTRUCTION (ENGLISH, FRENCH, GERMAN, SPANISH) (Canadian, AEP, Panama, Australian) MANUAL, INSTRUCTION (ENGLISH) (US) MANUAL, INSTRUCTION (ITALIAN, DUTCH, FINNISH, SWEDISH) (AEP) HEADPHONE MDR-W14G//K SET 25

19 SRF-M75PM Sony Corporation Personal Audio Company 26 99D Printed in Japan Published by General Engineering Dept.

SRF-M75PM SERVICE MANUAL FM STEREO/AM PLL SYNTHESIZED RADIO. US Model Canadian Model AEP Model E Model Australian Model. Ver

SRF-M75PM SERVICE MANUAL FM STEREO/AM PLL SYNTHESIZED RADIO. US Model Canadian Model AEP Model E Model Australian Model. Ver SRF-M75PM SERVICE MANUAL Ver 1.0 1999. 04 US Model Canadian Model AEP Model E Model Australian Model SPECIFICATIONS US, Canadian, and E models AEP, Australian models FM STEREO/AM PLL SYNTHESIZED RADIO