United-Motors-Service-Delco-983578 电路原理图.pdf

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1、VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION BUICK WONDER BAR MODEL 980297 J0XCO PONTIAC DELUXE ELECTRAMATIC MODEL 983578 (Additional service data and alignment on page 29, adjacent at right) BASIC TROUBLESHOOTING Put ear next to speaker and turn radio on. If slight “thump” is hea

2、rd as this is done, trouble is in tube stagestry new tubes. If no “thump” at all is heard, measure voltage from transistor case to radio chassis. If 1-2 volts is present, transistor is operating normal ly and trouble is either in speaker, speaker interlock socket, or one of the tube circuits. If no

3、voltage is present in step 2, check tran sistor circuit and particularly the transistor fuse resistor, Illustration No. 69. 收音机爱 好者资料库 RadioFans.CN VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION DELCO - BUICK Model 980297, PONTIAC Model 983578, Continued SCHEMATIC DATA Voltages meas

4、ured terminal to chassis with a VTV1 - No signal and 12.0 volts at Illustration 38. Oscillator grid voltage taken with set tuned to 1000 kc. Total “A” drain at 12 volts - 2.6 amps. Tolerance on voltage 10%. * Indicates lead from tuner coil assy. Before measuring transistor voltages, the shorting typ

5、e speaker socket must be opened and a 4 ohm speaker connected If transistor is replaced, adjust bias potentiometer (Illustration 85 to obtain proper collector volt age with 12 volts input to radio. Speaker must be connected. -f_Illustration 69 is a fuse resistor for the transistor. Output transforme

6、r may appear shorted if shorting type speaker socket is not held open. BF-3 tuner use combination switch (Illus. #89), F-4 tuner uses separate switches, WHITE NUMBERS ON PRINTED CIRCUIT DRAWING CORRESPOND TO THE ENCIRCLED NUMBERS ON SCHEMATIC. ILLUSTRATION #69 IS A FUSE RESISTOR. IF THIS IS OPEN, TH

7、E TRANSISTOR VOLTAGE WILL BE “O.” TUBE VIEW HI Dummy Antenna Connect Signal Generator To Signal Generator Frequency 0.1 Mfd 12AD6 Grid (Pin 7) 262 KC .000082 Mfd. Antenna Connector 1615 KC .000082 Mfd Antenna Connector 600 KC .000082 Mfd Antenna Connector 1615 KC .000082 Mfd. Antenna Connector 1100

8、KC Tune Receiver To Adjust in Sequence For Output Indicated High Frequency Stop A, B, C (Max.), D (Min.) High Frequency Stop Signal Generator Signal Signal Generator Signal Signal Generator Signal E, F, G (Max) J, K (Max.) F, G (Max) L “Tune manually towards the high frequency end of dial to the poi

9、nt where the solenoid switch closes. Before making this adjustment, check the setting of oscillator core “II ” The rear of the core should be 1% 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 adjustm

10、ent is made from the mounting end of the coil form with a non-metallic screw driver. “L” is the pointer adjustment in the middle of the core guide baradjust so pointer reads 1100 KC. With the radio installed and the 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.) 29 收音机爱 好者资料库 RadioFans.CN