Troubleshooting - Yamaha CRX-E500 Service Manual

CDC-E500
I TROUBLESHOOTING
<Data cannot be read>
YES
Is disc dirty or
scratched?
NO
Outermost
Pick-up position
(on mirror
surface)
Within disc range
Pick-up defective.
Spindle servo defective.
VCO defective.
(Motor fails to run, etc.)
<Focus drops>
YES
Is disc dirty or
scratched?
NO
Outermost
Pick-up position
(on mirror
surface)
Within disc range
FOCUS servo defective.
Pick-up defective.
<Sound skips. (Time display fails to advance properly)>
Is disc dirty or
YES
scratched or
warped?
NO
Is disc or disc
YES
stabilizer in contact
with mechanism?
NO
Tracking servo system defective.
FEED Servo system defective.
FOCUS servo defective.
Pick-up defective.
<No search provided. (Sound skipped after search)>
Is disc dirty or
YES
scratched or
warped?
NO
YES
Is TER waveform
normal?
NO
IC200 or IC202 defective.
26
Check by using another disc.
TRACKING servo defective.
FEED servo defective.
Pick-up defective.
Check by using another disc.
TRACKING servo defective.
FEED servo defective.
Pick-up defective.
Check by using a known good disc.
Poor Mechanism.
Floating rubber, Pick-up connector,
etc.
Check by using a known good disc.
TRACKING servo system defective.
FEED servo system defective.
FOCUS servo system defective.
Pick-up defective.
<No sound generated, Sound cut during play.>
(but time display advances properly)
YES
MUTING circuit defective.
MUTING applied.
Microcomputer defective.
NO
IC202 or IC207 or IC208
defective.
<Operates as if no disc loaded. (although loaded)>
Does MECH
NO
(DRAWER, CLAMP,
MECH drive defective.
CARRIAGE) operate
normaly?
YES
Is Pick-up at
NO
Feed limit switch defective.
innermost position?
YES
NO
Is FOCUS
Focus servo system defective.
lock done?
YES
NO
Does spindle
Spindle servo system defective.
motor run?
YES
NO
Jitter defective.
Is EFM signal
VCO defective.
normal?
YES
IC1 or IC202 defective.
Microcomputer defective.
<MECH abnormal operation>
Is operation NO
Motor drive defective.
speed normal? MECH defective.
YES
SW (Ex, Home, Carriage,
NO
Is SW logic correct?
OP/CL, FWD, RVS) or SW
circuit defective.
YES
Microcomputer defective.