UNITED MOTORS SERVICE AUTO RADIO BULLETIN

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UNITED MOTORS SERVICE DIVISION OF GENERAL MOTORS CORPORATION General Offices - Detroit AUTO RADIO BULLETIN Bulletin 6D-854 Date 11-1-54 Page 1 FIRST ISSUE GENERAL SUBJECT: SERVICE INSTRUCTIONS - 12V

1 UNITED MOTORS SERVICE DIVISION OF GENERAL MOTORS CORPORATION General Offices - Detroit AUTO RADIO BULLETIN Bulletin 6D-854 Date Page 1 FIRST ISSUE GENERAL SUBJECT: SERVICE INSTRUCTIONS - 12V CHEVROLET CUSTOM DELUXE MODEL MOUNTING All 1955 Chevrolet Cars. TUBES Six, Plus Rectifier and Trigger. SPEAKER 6"x9" Permanent Magnet. TUNING Electronic, Pushbutton, and Manual. Series F-l. ANTENNA TRIMMER COMPENSA TION For Antennas Between Mfd. TUNING RANGE KC. PUSHBUTTON SET-UP 1. Open the hinged door below the dial exposing the selector tabs. 2. Tune in the desired signal nearest the left end of the dial. Dial Light Lead Off-on Volume A Station Lead Selector Bar Tone B + & Audio Cable Push Manual Control Sensitivity Control MODEL Filament Lead 3. Move the first selector tab (one farthest left) until it lines up with the pointer tip. 4. Repeat set-up steps 2 and 3 for the remaining selector tabs, choosing stations from left to right on the dial. 5. Check the settings of each selector tab by depressing the corresponding station selector button. If the correct station is not tuned in re-adjust the selector tab. SIGNAL SEEKING TUNER ALIGNMENT PROCEDURE: NOTE: When aligning the signal seeker tuner type radio, be sure to use a vacuum tube voltmeter as indicated and be sure to follow the alignment sequence given (Notice that the primary of the 2nd I.F. is aligned first.) Output Meter Connection VTVM From AVC Line To Chassis (see Parts layout page 2) Generator Return Receiver Chassis Dummy Antenna In Series With Generator Volume Control Maximum Volume Sensitivity Control Position 2. (Position 1 is Maximum) Tone Control Treble (Max. Clockwise) Generator Output Not to Exeed 2 Volts at VTVM Step Dummy Antenna Connect To Signal Generator Frequency Tune Receiver To Adjust in Sequence Mfd. 12BE6 Grid (Pin 7) 262 KC *High Frequency Stop A, B, C (Max.) Mfd. 12BE6 Grid (Pin 7) 262 KC High Frequency Stop D (Min.) Mfd. Antenna Connector 1615 KC High Frequency Stop **E, F, G (Max.) Mfd. Antenna Connector 600 KC Signal Generator Signal J, K (Max.) Mfd. Antenna Connector 1615 KC Signal Generator Signal F, G (Max.) Mfd. Antenna Connector 1000 KC Signal Generator Signal *To tune to high frequency, put a 0.070" feeler gauge (or bare # 13 wire) in slot against the high frequency stop. (See tuner pictures). Turn manual control to allow the planetary arm to run against the feeler gauge. **Before making this adjustment, check the setting of oscillator core H. The rear of the core should be 1-25/32" from the mounting end of the coil form. This measurement is readily made by inserting a suitable plug in the mounting end of the coil form. The core adjustment is made from the mounting end of the coil form with an insulated screw driver. (It will be necessary to steady the core guide bar by applying a downward pressure at the antenna core end of the bar while making these adjustments.) If this adjustment is necessary, first dissolve the glyptal seal on the core stud and be sure to re-seal after making the adjustment. *"L"is the pointer adjustment screw on the end of the core guide bar adjust so pointer reads 1000 KC. With the radio installed and the antenna plugged in, adjust the antenna trimmer C for maximum volume with the radio tuned to a weak station between 600 and 1000 KC (see sticker on case). g o : 6, WD, ESD, 31 PRINTED IN U. S. A.

2 Bulletin Chevrolet Date: Page 6D R F UNIT Tuner Button Mechanism Cross Section PARTS LAYOUT TUBE VIEW AUDIO POWER SUPPLY UNIT PARTS LAYOUT TUBE VIEW PARTS LAYOUT CHASSIS VIEW Connect vacuum tube voltmeter between AVC line and ground during alignment. PARTS LAYOUT CHASSIS VIEW NOTE: This radio uses Series F 1 Tuner. For complete Tuner Information see Bulletin 6D-621.

PRINTED bcontact y G.T ho m ps on TUNER CIRCUIT COMPONENTS d te bu tri C on IN U. S. AL S U AN M TO LERA NCE ON VOLTAGES ±10% TOTAL "A" DRAIN 3.3 AMPS. TOTAL " b " DRAIN 67 MA.

3 PRINTED bcontact y G.T ho m ps on TUNER CIRCUIT COMPONENTS d te bu tri C on IN U. S. AL S U AN M TO LERA NCE ON VOLTAGES ±10% TOTAL "A" DRAIN 3.3 AMPS. TOTAL " b " DRAIN 67 MA. VOLTAGES MEASURED TERM INAL TO CH A SSIS WITH A VTVM. - N O SIG NA L AND 12.0 VOLTS AT ILLUS T U N E R STOPPED. OSCILLATOR GRID VOLTAGE TAKEN WITH SE T TUNED TO 1000 KC. EV Y H C A -S E N S IT IV IT Y CONTROL IN POSITION # 2. -C O L O R S OF TERM IN A LS ON S E R V IC E PART. * - INDICATES LEAD FROM TUNER COIL ASS'Y. * * SE E SERVICE PARTS L IS T FOR R E PL A C E M EN T X -B + CONNECTION K - IN D IC A T E S THOUSAND FOR RESISTOR VALUES. E N LI N O CH EVRO LET M ODEL LD O Bulletin Chevrolet Date: Page 6D A.

4 Bulletin 6D -854 Chevrolet D ate: Page TUNER UNFOLDED Low Frequency Stop High Frequency Stop ESCUTCHEON CROSS-SECTION TUNER NOTE: For a complete discussion of the Series F 1 Signal Seeking Tuner see Bulletin 6D-621.

5 SERVICE PARTS LIST Chevrolet Model Bulletin 6D-854 Date: Page 5 Illus. No. Description ELECTRICAL PARTS Coils Antenna Antenna Series Choke R.F Oscillator st I.F nd I.F. *7 * Power Transformer Choke Heater Choke Capacitors * Antenna Trimmer mfd 200V. Tubular ( ) mfd 200V. Tubular ( ) 15 G mfd Molded Mica Dual Trimmer 16A R.F. Section 16B Oscillator Section mfd 400V. Tubular ( ) 18 G mfd Molded Mica mfd Temp. Compensating Molded Mica ± 5 % Molded Mica ± 5 % mfd 600V. Tubular ( ) 23 G mfd Molded Mica mfd 600V. Tubular ( ) *25 * mfd Disc Ceramic mfd 400V. Tubular ( ) 27 G mfd Molded Mica 28 M-908 Electrolytic ( ) 28 A 20 mfd 25V. 28B 20 mfd 400V. 28C 20 mfd 400V. 29 H mfd 1000V. Tubular ( ) mfd 600V. Tubular ( ) mfd 200V. Tubular ( ) *33 * Spark Plate Ass y. 34 H mfd 1600V. Buffer ( ) mfd 100V. Tubular ( ) mfd 100V. Tubular ( ) mfd 200V. Tubular ( ) I.F. Cathode By-Pass Resistors Megohms ½ W ohms ½ W ,000 ohms 1W ,000 ohms ½ W Megohms ½ W ± 5 % ,000 ohms ½ W ,000 ohms 2W ohms ½ W ohms l/ 2W Megohm ½ W ± 5 % Megohms ½ W ± 5 % ,000 ohms ½ W Megohm ½ W Megohms ½ W ,000 ohms ½ W ohms ½ W ohms ½ W ,000 ohms 1W ohms 1W Megohms ½ W Number stamped on part but not same as * Part first used in 1955.

6 Bulletin 6D-854 Date: Page 6 SERVICE PARTS LIST Chevrolet Model (con t.) Illus. No. Description Resistors (cont d.) ,000 ohms 1W ± 5% ,000 ohms ½ W ohms 1W ohms ½ W ,000 ohms ½ W *74 * ohms ½ W ,000 ohms 1W ± 5% ,000 ohms 1W { ohms ^ replace and with 1171 in 1204 parallel ,000 ohms 1W (carbon rod type) megohm ½ W ,000 ohms ½ W Number stamped on part but not same as *Part first used in BA6 12BE6 12BF6 12V6GT 12AU7 0Z4 Tubes 12BA6 12BE6 12BF6 12V6GT 12AU7 0Z4 Miscellaneous Board, Tab Rail Contact, and insulator, Push Button Slide (set of 5) Contact, Selector Tab (set of 5) *84 * Control, Sensitivity *85 * Control, Volume, Tone and Switch 85A Volume Control 85B Tone Control 85C On-Off Switch 86 Dial Light Bulb # Relay *88 * Solenoid and Plunger Ass y Speaker, Elliptical 6" x 9" ( ) Switch, Tuner Return U Spring *91 * Switch, Station Selector U Spring Transformer, Input Transformer, Output Transformer, Power Vibrator, 12V ( ) MECHANICAL PARTS R.F. Chassis Antenna Connector * Terminal, A Lead and Dial Light Lead * Connector Pkg., Filament Lead (Rec. Power Supply) * Dial Light Ass y. 101 * Plug Pkg., Cable Connecting 6072 Socket, 7 pin miniature 6073 Socket, 9 pin miniature * Tube Shield Audio Power Supply Chassis Socket, Cable Connecting 6070 Socket, Octal 6074 Socket, Vibrator Tuner Backplate, Pointer Button and Slide Ass y. 112A Contact, Grouding ( with above ass y.) Core Bar Assembly Core, Powdered Iron Tuning

7 S E R V IC E PA R TS L IS T C h ev ro let M odel (con t.) Number stamped on part but not same as * Part first used in Usage Illus. No. HARDWARE Description Quantity and Description Case screw No x ¼ Hex Head Slotted Self Tapping Screw Oversize Case screw No x ¼ Hex Head Slotted Self Tapping Screw Speaker No x ½ Hex Head Machine Screw (with lockwasher) Relay & solenoid Mtg No x Hex Head Machine Screw Bulletin 6D-854 Date: Page 7 Tuner (cont d.) *115 * Escutcheon *115A * Dial Calibrated *115B * Dial Backplate 115C Dial Retainer Spring 115D Door, Tab-Access 115E Station Selector Bar ( with Escutcheon ) 115F Station Selector Bar Spring *116 * Gear Train Assembly *116A * Worm Gear Pkg Indicator, Selector Tab (set of 5) *120 * Pointer Arm Assembly *121 * Shaft, Manual Drive Spring, Anti-Squeak, worm gear Spring Clip Spring, Gear Train Power Spring, Slide Return Installation Parts 6030 Capacitor, (.5 mfd) Generator ( ) 6030 Capacitor, (.5 mfd) Ignition Coil ( ) 6030 Capacitor, (.5 mfd) Voltage Regulator ( ) Fuse, 7½ amp. * Escutcheon Backplate (Metal) * Escutcheon Selector (Plastic) * Escutcheon Volume (Plastic) * Knob Wing * Knob Control Coil Assy, and Coil housing Mtg No x ¼ Hex Head Self Tapping Screw FST circuit board No x 3/16 Oval Head Machine Screw Worm Gear No x ½ Headless Slotted set screw (Cone Point) Set screw lock (Worm gear) No Hex Nut SST switch mounting No Hex Nut Gear train No Hex Nut SST switches U Spring Antenna & RF coil Mounting Grommet Oscillator Coil Mounting Grommet

UNITED MOTORS SERVICE D IV ISIO N OF GENERAL M O TO RS C O R P O R A T IO N. General Offices - Detroit AUTO RADIO BULLETIN

UNITED MOTORS SERVICE D IV ISIO N OF GENERAL M O TO RS C O R P O R A T IO N General Offices - Detroit AUTO RADIO BULLETIN Bulletin 6D-855 Date 11-1-54 Page 1 FIRST ISSUE SUBJECT: SERVICE INSTRUCTIONS -