Yamaha TSX-10 Service Manual page 15

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2) Troubleshooting from System Malfunctions
a) CD lid fails to open/close.
CD lid starts to
move but stops.
NO
Is output
available at LOADING
motor terminal?
NO
FLSW = "L"
NO
Limit switch defective
FEED servo system defective
Microcomputer defective
When CD lid fails to close completely
(when it stops midway)
[Corrective measure]
1) Turn ON the power and open the CD lid.
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L 13942296513
2) Turn OFF the power and force the CD lid to close.
3) With the power turned ON, open and close the CD lid
to check if the CD lid closes completely.
b) No sound generated, Sound cut during play.
( but time display advances properly)
MUTING applied.
NO
IC406 defective
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Poor mechanism
YES
operation
Wire caught.
Loose gear, etc.
YES
Motor defective
Microcomputer or
YES
LOADING IC (IC405)
defective
YES MUTING circuit defective
Microcomputer defective
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c) Operates as if no disc loaded. (although loaded)
Does CD lid
close properly?
YES
Is pick-up at
innermost position?
YES
Is FOCUS
lock done?
YES
Does spindle
motor run?
YES
Is EFMI signal
normal?
YES
IC404 or IC406 defective
Microcomputer defective
d) Sound skips.
Q Q
(Time display fails to advance properly)
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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,
scratched or
warped?
NO
Is TER
waveform normal?
NO
IC406 defective.
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.
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NO
Poor CD lid operation
NO
Feed limit switch defective
NO
FOCUS servo
system defective
NO
Spindle servo
system defective
NO
Jitter defective
1 5 0 5 8 2 9 9 4
YES
Check by using a
known good disc.
Poor mechanism
accuracy.
YES
Floating rubber/
spring deformed.
Pick-up connector
assembly caught.
YES
Check by using a
known good disc.
Tracking servo system defective
YES
FEED servo system defective
FOCUS servo system defective
Pick-up defective
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TSX-10/15/20
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