MD-R3H
– 62 –
TROUBLE SHOOTING (CD SECTION)
CD fails to operate
If the objective lens of optical pickup is contaminated, CD may fail to operate. At first clean the objective lens, and check playback
operation. If CD does not operate persistently, check as follows.
If dust or foreign substance is accumulated on the pickup lens, playback is disturbed and TOC (content of item) is not displayed.
Before adjusting check whether the lens is clean. If the lens is contaminated, treat it as follows.
Turn off power supply, impregnate the lens cleaning paper with a small quantity of isopropyl alcohol, and gently wipe the lens with
it with due care so that the lens is not damaged.
At this time do not contact directly the lens with our finger.
Set disc, turn on power supply, press the CD (stop) button, and check voltage of BI851/CNS552A/B.
Is voltage specified in wiring diagram applied?
No
Check the main unit side power circuit.
Check as stated in item "Laser does not light".
No
Yes
Does laser light in the CD TEST mode 1?
Yes
No
Check as stated in item "Focusing failure".
Does process proceed from the CD TEST mode 1 to 2?
Does the disc motor rotate normally when the mode is
changed from the CD TEST mode 2 to 3?
Check as stated in item "Disc motor CLV servo failure".
No
Yes
Is output of pin 3 (HF) of TP751 flat in the CD TEST mode 4?
Yes
Check as stated in item "HF trouble"
No
Yes
Is sound output when the CD TEST mode 5 is set and the optical
pickup is moved to the track existing position
with (skip) (skip)?
No
Yes
Check as stated in item "Slide
motor fails to run"
No
Check as stated in item
"Sound is not output".
No
No
Is the optical pickup In
switch in OFF state?
Does the optical pickup
return to the inner position?
The optical pickup IN switch
is defective (ON state).
Yes
Does the slide motor run?
Is initialization performed when power is once turned off and then
turned on?
Check as stated in item "Track search is disabled."
No
Is playback performed for several tens seconds after playback is
started?
Check as stated in item "Slide servo fails to run"
No
Yes
Normal
The optical
pickup In
switch is
defective.
Check
microcomputer
PWB.
OFF
ON
Are tracks played back sequentially with (skip)?
Yes
Yes