Yamaha CDR-D651 Service Manual page 11

2) Estimating possible cause from erroneous
operation
a) Tray fails to come out or go in.
YES
Does tray move
but stop halfway?
NO
YES
Is output obtained at
LOADING terminal?
NO
YES
Is FLSW at "L" ?
NO
Defective limit switch, error
in feed servo related section,
defective microprocessor.
When the tray fails to close completely (when the tray
stops halfway)
[Correction]
1) Turn on the power to open the tray.
If it cannot be opened (because the head and tray
contact each other), remove the chucking unit and then
open it.
2) Turn off the power to force the tray to close fully.
3) Turn on the power and open/close the tray so as to
check that the tray closes completely.
b) Sound is not produced or interrupted while playing.
(Time on display advances properly.)
YES
Is muting applied?
NO
Defective IC3, defective IC100, 101.
NO
Selected drive and selector
(IC106) are not matched.
YES
Defective IC106 or IC301
IC106 pin10
CD side: L, CDR side: H
Poor mechanism operation,
wire being caught, loose
gear, etc.
Defective motor.
Defective microprocessor,
defective loading IC (IC2).
Error in muting circuit,
defective microprocessor.
c) "No disc" appears on display.
Does tray
NO
loading function
work properly?
YES
NO
Is pickup at the
innermost track?
YES
NO
Does focus lock
function work?
YES
NO
Does spindle
motor run?
YES
NO
Is EFM signal
output?
YES
Defective IC3, defective
microprocessor.
d) Sound skips. (Time on display does not advance
correctly.)
YES
Is disc dirty,
scratched or warped?
NO
YES
Is disc or disc stabilizer in
contact with mechanism?
NO
Error in tracking servo related
section, feed serve related
section or focus servo related
section, defective pickup.
e) Searching function fails to work.(Sound skips after
searching.)
Is disc dirty,
YES
scratched or
warped?
NO
YES
NO
Defective IC3.
CDR-D651
Faulty tray loading function.
Defective feed limit switch.
Error in focus serve related
section.
Error in spindle servo related
section.
Defective jitter.
Check with a known-
good disc.
Poor mechanism accuracy,
deformed floating, rubber or
spring, pickup connector
assembly being caught.
Check with a known-
good disc.
Error in tracking servo
related section, feed
serve related section or
focus servo related
section, defective pickup.
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