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14. Trouble Shooting
14-(1)
When Turntable Operation is Abnormal
Is the power
cord plugged
into an
AC outlet?
Does prism
indicator light in
soft red?
Is wiring
disconnected or badly
soldered?
Power circuit
generates
18.6 V?
Yes
Is AC 32V
present at D and
@ of the circuit
board?
Is 18.6 V
present at the emitter
of X801?
Yes
Is approx.
12.8 V present
at Pin 7 of
1¢3?
Does platter
rotate when Pin 5 and
8 of IC1 are short-
circuited?
Connect.
Replace.
Check the trans-
former for dis-
connected wires
and
damaged
printed pattern
Check X802,D802
Turntable con-
tinues rotating
when rotated
by hand?
Yes
coils.
IsOC3.7V
Present at
Pin 5 of 1C3?
nee
_—=
IsOC4.2V
present at
Pin 7 of 1C2?
soldered?
Is the wave-
circuit diagram pre-
sent at TP-2?
Yes —
—18—
1C2 is defective.
|
Replace.
|
Sac
No
Check all driving
IC3 is defective,
—
Is 1C2 or
R12,C10, C11
defective?
Is the wave-
form shown in the
circuit diagram present at
TP-6 when platter
is rotated by
hand?
Platter rotates?
adjustment
Perform locking
Yes
check the phase.
or
Yes
Check
if C18,
C28,
R18,
R24
are open.
Observe the FG
output
and
IC3
performance
to
trase the defect
OL-F61
No. 2560
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