
7} TROUBLESHOOTING
SYMPTOM CAUSE/REMEDY
1 ) No output. 1. Faulty AC power cord
Replace the cord.
2. Defective power switch
Replace the switch.
3. Broken wire in the power transformer
Replace the transformer.
2) Pilot lamp does not light. 1. Broken lamp
Replace the lamp.
2. Open in the power transformer tertiary winding
Replace the power transformer.
3 ) Pilot lamp lights but no speaker output. 1. Defective capacitor C403
Replace the defective capacitor.
2. Defective diode D401 ,402,403 or 404
Replace the defective diode(s).
3. Defective in the power transformer secondary winding
Replace the power transformer.
4) Blows fuse. 1. Defective diode D401-4O4 in the rectifier circuit
Replace the defective diode(s).
2. Short-circuit in the rectifier circuit
Remove the short.
3. Short-circuit in Main Amp circuitry
Repair circuit and/or replace the defective power lC 301
5-1) No output one channel with VOLUME
at maximum and BALANCE at center,
when a test signal is applied to the ter-
minal of non-operating channel of the
BALANCE control VR2O2.
1. Defective transistor TR205,206 or TR301-308
Replace the defective transistor(s).
2. Defective resistor or capacitor of TONE or MAIN AMP
circuit
Replace the defective part(s).
3. Defective power lC 301
Replace the power lC.
5-2) No output when a test signal is ap.
plied to the input terminals. 1. Defective transistor, resistor or capacitor of PRE AMP
circuit
Replace the defective part(s).
2. Defective MONO/STEREO switch
Replace or repair the switch.
3. Defective Selector switch
Replace the Selector switch.
6) Speaker works normally
phone does not work. but head- 1. Defective R601 (left) or R602 (right)
Change it.
7) All the inputs work normally except
"AUX" input. 1. Poor contact in "AUX" input jack
Replace or repair it.
2. Defective resistor R501, 502, 503, or 504
Replace it.
3. Poor contact in Selector switch
Repair or replace the switch.
8) "PHONO" input not operative. 1. Poor contact in "PHONO" input jack
Repair or replace it.
2. Faulty Selector switch
Repair or replace the switch.
9) "TAPE OUT"inoperative. 1. Poor contact in "TAPE OUT" output jack
Repair or replace it.
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