TROUBLESHOOTING
(CD
SECTION)
When the CD does not function
When the CD section does not operate When the objective lens of the optical pickup is
dirty,this
section may not
operate.Clean
the
objective
lens,and
check the playback
operation.When
this section does not operate even after the above step is takencheck the
following items.
Remove the cabinet and follow the troubleshooting instructions.
“Track skipping and/or no TOC(Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup lens.
Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned
below.”
Turn the power off.
Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.
Do not touch the lens with the bare hand.
Is
L
pulse (approx. 300 ms) input into the
PC701
pin 26 when the
turntable is rotating?
,
Yes
b
Check the SW2 and the wiring from the
IC701
pin 26 to the
No
sw2.
Is there following voltage input on the
IC701
pin 9 in the specific
state?
When the CD mechanism is moved up:
L
In other states:
H
, Check the SW3 and the wiring from the
IC701
pin 9 to the
No
sw3.
Yes
f
/
Check
Q901,
Q902,
and Q904 and the periphery.
I
.
Is there following voltage input on the
IC701
pin 9 in the specific
state?
-
When the CD mechanism is moved up:
L
In other states:
H
+
Check the SW3 and the wiring from the
PC701
pin 9 to the
No
sw3.
Yes
t
I
S
L
output from the
IC701
pin 25
I
Check the wiring from the
IC701
pin 25 to the Q903 base.
I
Yes
Is
H
output from the
IC701
pin 19 during SEC when the disc skip
switch is pressed?
Yes
v
Check the wiring of
IC701
pin 19 and Q904 pin 2.
OK
IC701
defective.
Is
4v
output
from
the
Q901
emitter during operation stated
above?
Yes
Check
Q901,
Q902,
Q904 and the periphery.
t
Check turntable motor (Ml) and turntable mechanism.
1.
-12-
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