UNITED MOTORS SERVICE. DIVISION OF GENERAL MOTORS CORPORATION General Offices - Detroit AUTO RADIO BULLETIN

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1 UNITED MOTORS SERVICE DIVISION OF GENERAL MOTORS CORPORATION General Offices - Detroit AUTO RADIO BULLETIN Bulletin 6D-848 Chevrolet Page 1 SUBJECT: SERVICE INSTRUCTIONS CHEVROLET CUSTOM DELUXE WITH PUSH BUTTONS MODEL GENERAL M OUNTIN G A ll 1951 Chevrolet Cars. TUBES Five, plus rectifier. SPEAKER 6" x 9" Elliptical, Permanent Magnet. TUNIN G Manual and 5 P. B. Mechanical. AN TEN N A TRIMMER COM PENSA TIO N For Antennas Between M fd. TUNIN G RANGE KC. PU SH BUTTON SETUP PROCEDURE Pull Push Button to the right and out. Tune in desired station manually. Push button all the way in. ALIGN M EN T PROCEDURE "A Lead Dial Light Lead Output Meter Connections Across Voice Coil Generator Return To Receiver Chassis Tone Control Volume Control and Switch MODEL Dummy Knob Tuning Control Dummy Antenna In Series W ith Generator Volume Control Position Maximum Volume Tone Control Position Treble Generator O u tput Minimum for Readable Indication Steps Series Condenser or Dummy Antenna Connect Signal Generator to Signal Generator Frequency Tune Receiver to Adjust in Sequence For Max. Output Mfd. 6BE6 Grid (Pin #7) 260 KC High Frequency Stop A, B, C, D Mfd. Antenna Connector 1615 KC High Frequency Stop *E, F, G Mfd. Antenna Connector 1400 KC Signal Generator Signal J, K Mfd. Antenna Connector 1615 KC High Frequency Stop F, G Mfd. Antenna Connector 1000 KC Signal Generator Signal L* * * Before making this adjustment check mechanical 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.) If adjustment is necessary, first dissolve the glyptal seal on the core studs. Core adjustments should be made with an insulated screw driver, and core studs should be cemented in place with glyptal or household cement after alignment. **L is the pointer adjustment screw which is on the connecting link, between the pointer assembly and core guide bar (See tuner Dwg.). It should be adjusted so that when looking directly at the dial the pointer is on the 1000 KC mark. This setting is to give the correct relationship between the pointer and the dial when the radio is installed in a car. W ith the radio installed and the car antenna plugged in adjust the antenna trimmer "G for maximum volume with the radio tuned to a weak station between 600 and 1000 KC (see sticker on case). PRINTED IN U. S. A.

2 Bulletin Chevrolet Date:.Page 6D TUBE SOCKET VOLTAGE CHART The tube socket voltages, as measured at the factory and under the conditions shown on the schematic diagram on page 3 are shown above. The blank spaces are provided so the service man may fill in the actual voltage readings as taken with his own equipment. A normal operating radio should be used for these measurements. PARTS LAYO U T TUBE VIEW VOLTMETER RESISTANCE OHMS PER VOLT READINGS TAKEN W IT H VOLTS AT SPARK PLATE Voltage measured from socket terminals to chassis and are positive unless marked otherwise. PARTS LAYO U T CH ASSIS VIEW

ALL VOLTAGES MEASURED FROM SOCKET TERMINALS TO CHASSIS WITH A 20,000 OHM PER VOLT VOLTMETER. MEASUREMENT TAKEN WITH NO SIGNAL AND 6.0 VOLTS AT SPARK PLATE. TOTAL "A" DRAIN 6.5 AMPS.

3 ALL VOLTAGES MEASURED FROM SOCKET TERMINALS TO CHASSIS WITH A 20,000 OHM PER VOLT VOLTMETER. MEASUREMENT TAKEN WITH NO SIGNAL AND 6.0 VOLTS AT SPARK PLATE. TOTAL "A" DRAIN 6.5 AMPS. TOTAL " B " DRAIN 50 MA. TOLERANCE ON VOLTAGES ± 10%. PRINTED IN U. 5. A. CHEVROLET SEE SERVICE PARTS LIST FOR REPLACEMENT. A OSCILLATOR GRID VOLTAGE AT 1000 KC. * - COLORS OF TERMINALS ON SERVICE PARTS, -V A R IE S WITH SENSITIVITY CONTROL SETTING. Bulletin Chevrolet Date: Page 6D

4 Bulletin 6D-843 Chevrolet Page 4 TUNER ESCUTCHEON CROSS SECTION NOTE: FOR COMPLETE SERVICE INFORMATION ON THE PUSH-PULL LOCK-UP TUNER SEE BULLETIN 6D-619

5 Bulletin 6D-848 Chevrolet Page 5 SERVICE PARTS LIST Illus. No. Production Service Description ELECTRICAL PARTS Coils Antenna Antenna Series Choke Antenna Spark Choke R.F Oscillator st I.F nd I.F. * * Hash Choke * * Spark Choke Condensers * * Antenna Trimmer mfd 400V Tubular mfd 200V Tubular G mfd Molded Dual Trimmer 15A R.F. Section 15B Oscillator Section G mfd Molded mfd Compensating mfd 400V Tubular * Electrolytic 19A 20 mfd 25V 19B 20 mfd 400V 19C 20 mfd 400V Chassis Plate Condenser mfd 800V Tubular mfd 200V Tubular mfd 600V Tubular G mfd Molded mfd 600V Tubular Dual Spark Plate Chassis Plate Condenser H mfd 1600V Tubular Resistors ohms ½ W Insulated A Megohms ½ W Insulated C ,000 ohms 2W Insulated B ,000 ohms 1W Insulated A ,000 ohms ½ W Insulated A ,000 ohms ½ W Insulated A Megohm ½W Insulated A ,000 ohms ½ W Insulated A ,000 ohms ½ W Insulated A ,000 ohms ½ W Insulated A ,000 ohms ½ W Insulated A ,000 ohms ½ W Insulated B ohms 1W Insulated A Megohms ½ W Insulated ohms ½ W Insulated ohms ½ W Insulated B ohms 1W Insulated { C ohms 2W W ire Wound (Replace with B ohms 2W and 5600 ohm 1W in parallel) Tubes BA BE A V V 6GT Z4 * Parts First Used in 1951 PRINTED IN U. S. A.

6 Bulletin 6D -848 Chevrolet Page 6 SERVICE PARTS LIST Illus. No. Production Service Description Miscellaneous Electrical * * Control - Volume, Tone & Switch 51A Tone Control 51B Volume Control 51C Switch Lamp - Dial Sensitivity Control * * Speaker 6 x 9 Elliptical P.M. * * Transformer - Output Transformer - Power Vibrator * Parts First Used in 1951 MECHANICAL PARTS Chassis Socket - Antenna Socket 7-Pin Miniature Socket Octal Tube Socket Vibrator Tuner * * Backplate-Pointer Ball Bearings (10) * * Bushing & Manual Dr. Shaft Assy. * * Manual Drive Shaft Clutch Disc-Driven Connecting Link Core Bar Core Guide Bar Pointer Connecting Link Spring - Pointer Connecting Link Core Iron Tuning * * Escutcheon Assy. * * Dial - Backplate * * Dial Pkg. * * Gear and Bushing - Clutch * * Pointer Assy. * * Pointer Tip * * Push Button and Slide Assy Spring - Clutch Spring - Core Bar Connecting Link Spring Slide Return * * Socket Dial Light * * Worm Gear and Bracket INSTALLATION PARTS Condenser - Ammeter Condenser - Generator Condenser - Ignition Coil Condenser - Regulator Distributor - Suppressor Fuse Fuse Holder * Knob - Control * Knob - Dummy * Knob - Tone Control * Mounting Bracket Left Hand * Mounting Bracket Right Hand * Mounting Bracket - Fire W all Rubber Nipple - Suppressor Serrated Pad * Spacer Mounting Static Collector * Trim Plate

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 -