Sharp CD-C500Z

Is the laser control signal of pin 38 (LANF) of the
microcomputer (IC801) at a low level?
+ Is the Q7 laser diode driver ’
No
emitter voltage +5V?
Yes
Replace the optical pickup.
Is the pickup returned to the innermost part?
Is the pickup in switch SW1 turned to ON?
Yes
Check if pins 57 (FEM+) and 58 (FEM-) of ICI are
outputting.
Defective
l ICl is defective. Replace it.
1
Normal
Check pin 8 of the slide motor driver (IC5).
Normal
The slide motor driver(lC5) is defective.Repace it.
Check if there is voltage at CNP3,CNSS and Ml.
Is there audio output?
!
No
Is there audio output from both L and-R channels?
Yes
e l Check the muting Transistor, Q6 and Q8 and replace.
No
l Check the sound coupling capacitors Cl5(L-CH)
andClG(R-CH).
1
Is there + 5V at IC9?
Yes
hi Check power circuits ICI2 and IC13.
No
r
Is pin 36 of ICSOI muting output at a high level?
e Replace IC801.
No
Yes
.
1 Is pin 3 of Q6 and Q8 at a low level?
\-
No
Check the voltage of QlO and Ql I and replace faulty
parts.
Yes
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