United-Motors-Service-Delco-AC-2978 电路原理图.pdf

《United-Motors-Service-Delco-AC-2978 电路原理图.pdf》由会员分享，可在线阅读，更多相关《United-Motors-Service-Delco-AC-2978 电路原理图.pdf（1页珍藏版）》请在收音机爱好者资料库上搜索。

1、VOLUME R-21, MOST-OFTEN-NEEDED 1961 RADIO SERVICING INFORMATION DELCO Studebaker Radio Models AC-2978, AC-3085, AC-3087 STEPS SERIES CAPACITOR OR DUMMY ANTENNA CONNECT SIGNAL GENERATOR TO SIGNAL GENERATOR FREQUENCY TUNE RECEIVER TO ADJUST IN SEQUENCE FOR MAX. OUTPUT i 0.1 Mfd. 12AD6 Grid (Pin #7) 26

2、2 KC. High Frequency Stop A, B, D. C, 2 0.000068 Mfd. Antenna Connector 1615 KC. High Frequency Stop *E, F, G 3 0.000068 Mfd. Antenna Connector 600 KC. Signal Generator Signal J, K 4 0.000068 Mfd. Antenna Connector 1615 KC. High Frequency Stop F, G I2DZ6 I2AD6 I2EK6 I2DS7 W7. VOLTAGES MEASURED TERMI

3、NAL TO CHASSIS WITH A VTVM - NO SIGNAL AND 12.0 VOLTS AT ILLUS. 29. OSCILLATOR GRID VOLTAGE TAKEN WITH SET TUNED TO 1000 KC. TOTAL A DRAIN AT 12 V - 2.2 AMPS. TOLERANCE ON VOLTAGES 10% * -INDICATES LEAD FROM TUNER COIL ASSY. * -BEFORE MEASURING TRANSISTOR VOLTAGES, THE SHORTING TYPE SPEAKER SOCKET M

4、UST BE OPENED AND A 4 OHM SPEAKER CON NECTED. IF TRANSISTOR IS REPLACED, ADJUST BIAS POTENTIOMETER (ILLUS. 73) TO OBTAIN PROPER COLLECTOR VOLTAGE WITH 12 VOLTS INPUT TO RADIO ILLUS 60 IS A FUSE RESISTOR FOR THE TRANSISTOR. SERVICE WITH EXACT RE PLACEMENT -A LEAD TO HEATERS 7/A cjooeeo I-A/vVv- 7/0 5 MEG 1vyv is MEG m OUTPUT TRANSFORMER WILL APPEAR SHORTED IF SHORTING TYPE SPEAKER SWITCH IS NOT HELD OPEN STUDEBAKER AC-2978PRINTED CIRCUIT SHOWN IN HEAVY LINES. 27 收音机爱 好者资料库 RadioFans.CN