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AVR20MKII
TROUBLESHOOTING
Symptom
Cause and Remedy
Receiver inoperative
A) Faulty AC power cord.
(FL indicator does not light)
Replace.
B) Defective the power switch.
Replace.
C) Broken wire in the power transformer.
Replace the power transformer.
D) Blown fuse.
Replace the fuse.
Fuse blows when power is turned on. | A) Defective power transformer.
Replace.
B) Short on the primary or secondary of the transformer
circuitry.
Repair the trace.
C) Damaged rectifier (D208 to D211) or damaged transistor
(Q216 to Q217). Replace the defective componentis).
D) Short circuit in the amplifier circuit.
Replace the shorted componentis) in the amplifier circuit.
Power indicator lights but no sound
A) Speaker switch 1 or 2 defective.
from both channels
Replace the defective switch (es)
B) Defect in transistor Q216 L/R, Q217 L/R on the Main
Amp Board.
Replace the defective component(s).
Speaker A inoperative
A) Speaker switch A defective.
Replace
Speaker B inoperative
A) Speaker switch B defective.
Replace.
One channel does not work when
A) Defect in transistor Q216 L/R, Q217 L/R on the Main
Volume is at maximum with a test
Amp Board
signal applied to the center terminal
Locate and correct the defect.
of Volume control VR5 of the dead
B) Break in copper foil of printed circuit board.
channel
Repair the circuit trace.
C) Short in speaker output terminal.
Repair or replace.
Speaker works normally but
A) Headphone plug does not mate with jack.
headphones inoperative
Replace the jack.
B) Defective resistor R901, R902.
Replace.
PHONO input inoperative
A) Poor contact in phono input jack.
Repair or replace the jack.
B) Defective phono switch or IC 103.
:
Replace.
LOUDNESS has no effect
A) Defective loudness switch.
Replace.
B) Defective resistor R601, R602, C601, C602.
Replace the defective components(s),
FM inoperative
A) Defective front-end. (FE407-G60)
Replace.
B) Defective FM switch.
Replace the switch
17
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