Yamaha CDC-775 Service Manual page 16

CDC-775
c) Operates as if no disc loaded.
(although loaded)
Does table
rotate properly?
YES
Is table position
sensor normal?
YES
Does disc clamp
operate properly?
YES
Is pick-up at
innermost position?
YES
Is FOCUS
lock done?
YES
Does spindle
motor run?
YES
Is EFM signal
normal?
YES
IC1 or IC3 defective.
Microcomputer defective.
15
NO
Poor table rotation.
Infrared sensor defective.
NO
(D400)
Microcomputer defective.
Disc clamp defective.
NO
Clamp switch defective.
Microcomputer defective.
NO
Feed limit switch defective.
NO
FOCUS servo system
defective.
NO Spindle servo system
defective.
NO
Jitter defective.
d) Sound skips.
(Time display fails to advance properly)
Is disc dirty,
scratched or
warped?
NO
Is disc or disc
stabilizer in contact with
mechanism?
NO
Tracking servo system defective.
FEED servo system defective.
FOCUS servo system defective.
Pick-up defective.
e) No search provided.
(Sound skipped after search)
Is disc dirty,
YES
scratched or
warped?
NO
Is TER
YES
waveform normal?
NO
IC1 or IC3 defective.
Check by using a
YES
known good disc.
Poor mechanism
accuracy.
YES Floating rubber/spring
deformed.
Pick-up connector
assembly caught.
Check by using a known
good disc.
Tracking servo system defective.
FEED servo system defective.
FOCUS servo system defective.
Pick-up defective.