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WQ-CD220L
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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.
Set a disc, turn on the power, set the FUNCTION switch to CD, and check the voltage of CNS881A and CNS881B.
Eas
fae
\s the voltage as shown in the
schematic diagram being output?
Check the power circuit of the main unit.
Does the LCD function?
Check the item of "The LCD does not function'.
Yes
Check the item of "The laser does not go on'.
LJ LJ
Does the laser go on in test mode 1?
Is test mode 1 switched to test mode 2?
Check the item of "Does not focus".
Test mode 2 switched to mode 3 does the spin
Check the item of "The spin motor's CLV servo is defective".
motor run normally?
Yes
Is the output of pin 3 (HF) of TP751 flat in test
Check the item of "HF error'.
mode 4?
No
Yes
When the pickup moves to a track using the UP/
Does the slide motor run?
Check the item of "The slide motor does not
DOWN
button in test mode 5, is there audio
No
Y
No
run".
output?
es
Check the item of "There is no audio
Yes
output".
When the power is tumed off and then on, is the
Is the pickup returned to the inner
Is the pickup in switch set to OFF?
unit initialized?
No
position?
No
OFF
ON
Yes
Yes
The pickup in switch is defective (ON).
Check the peripheral
The pickup in switch
circuits of the control
is defective.
microcomputer.
Yes
Does the disc play back several ten seconds even
Check the item of "The slide servo does not function".
|
after starting playback?
No
Normal
Yes
Is there +5 V at pin 6 of CNP951A?
Check the PWB patterns from pin 1 of CNS881B to CNP951A.
Yes
ies
Is there +5 V at pin 24 (Vcc) of IC750?
7
Check the PWB patterns from pin 1 of CNS881B
to pin 24 (Vcc) of IC750.
|
ie)
Yes
OUT) of 1C750?
Is there +5 V at pin 2 of CNP951A?
Yes
Check the PWB pattern from IC750.
LI
1C750 is defective.
When shorting the both ends of C840, do the pins
15 (ACLR) and 16 (RESET OUT) of IC750 read 0
v?
When shorting C840 for a moment, does the LCD
Check the LCD PWB of CD.
function?
C840 is defective.
=96'=
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