Service manual
CD-C471
w
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 taken,check
the following items.
Remove the cabinet and follow the troubleshooting instructions.
“Trackskipping
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
from
;;“yJ
5
V
till OV down pulse (approx. 300 ms) input
v
Check the SW3 and the wiring from the
IC201
pin 54 to the
sw3.
into the
IC201
pin 54 when the turntable is rotating?
I
Yes
Is there following voltage input on the
IC201
pin 54 in the
specific state?
When the CD mechanism is moved up: OV
In other states:
5V
b
Check the SW2 MECHA UP SW and the wiring from the
No
IC201
pin 21 to the SW2 MECHA UP SW.
Yes
I
Check
IC2
pin26 Q9l and Q93 and the periphery.
I
Is there following voltage input on the
IC201
pin 54 in the
specific state?
When the CD mechanism is moved up: OV
In other states:
5V
Check the SW2 MECHA UP SW and the wiring from the
IC201
No
b
pin 54 to the SW2 MECHA UP SW.
1
Yes
Is
L
output from the
I22
pin 26 during SEC when the disc skip
switch is pressed?
Yes
?
Is
4V
output from the
Q91
emitter during operation stated
above?
Yes
Check the wiring of
IC2
pin 26 and Q93 BASE.
OK
IC2
defective.
Check
Q91,
Q93
and the periphery.
Check turntable motor and turntable mechanism.
I
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40
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