United-Motors-Service-Delco-983687 电路原理图.pdf

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1、23 收音机爱 好者资料库 RadioFans.CN 10.8 V. LINE GOOD SIGNAL VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION DELCO RADIO BUICK Model 980296 CHEVROLET Model 985264 PONTIAC Models 983579, 983687 STUDEBAKER Models AC-3216, AC-3247, AC-3256 (Continued from page 23. Applicable alignment table is o

2、n page 26, under another model.) I. TROUBLESHOOTING PROCEDURE 1. Turn radio on (ear near speaker). If no “thump” is heard, suspect: open fuse, open “Fuse resistor,” loose speaker plug, open speaker, or shorted DS501 transistor. 2. Isolate trouble to a stage (AF, IF, Conv., RFsee letters on circuit b

3、oard below). Use a noise generator or other device at each point, starting with 1. 3. Measure voltages in defective stage. Note: Voltage between 10.8 V. line (conductor #2) ! T 1 1 trSl ; o oocios. I b | ; o( ; ; ?o ugig! iij IT if * ri J|j YPS31|4 4 .1 I M7 A 0800 4 y, i $* Iti f Hi J If 1 1 1 (V) 1 rn. m 5# 1 $- - j-1 I m SCHEMATIC DIAGRAMCHANGES IN SOLID LINES V (|) i, fCQ poo . j *1 vz f 7h zm TO r-USC tfLCCK 25 收音机爱 好者资料库 RadioFans.CN