MD-MS722H/MS721H
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• The spindle motor fails to run.Does the head move
No
Does the waveform appear on the IC201 pins 24 and 25 after
TEST mode AUTO2 completion and in this state?
Check the IC201 periphery.
Yes
Does waveform appear on the IC601 pin 13?
Does waveform appear on IC901 pins 1, 19 and 20?
Replace the spindle motor.
Yes
No
L608, IC201, IC901, CN601 and flex, etc. soldering check.
No
Replace IC601.
Yes
• Recording/playback operation
Insert a low reflection disc, and ascertain audio output by normal playback, and then set TEST REC mode.
Yes
Does the head move down, failing to start record even
when the continuous record mode is set after address?
Check voltage of pins 52 and 53 of IC201, pins 2, 4, 7, and 9 of
IC651, pins 3 and 14 of CNS601. Check whether disc is record-
inhibited.
No
Does the RF waveform of TP201 appear when playback is
Does level of pins 34 of IC401 and pin 17 of IC101 change
depending on record and playback?
Is RF pattern output from IC201 pin 50?
Yes
No
Check for soldering failure of IC201 .
No
Check periphery of IC401 and IC101.
Check whether there is any damage in IC101, periphery of
laser diode.
Yes
Check for defects of IC351 in head drive flexible PWB,
Q351 to 354, head, flexible PWB.
No
Yes
Is audio monitor output given in normal mode LINE IN
record?
Check waveforms of pins 9 to 12 of IC501, pins 70 to 73 of
IC201.
Is waveform obtained on IC501 pins 3 and 6?
No
Yes
Check whether the pin 7 of IC501 and the pin 59 of IC201 are in
H state.
No
No
Does voltage on the IC701 pins 13 to 15 change in case of
record VOLUME UP/DOWN?
Is audio waveform observed on the pins 18 and 19 of
IC703?
Yes
Check whether input waveform is observed on the pins 5
and 6 of IC703.
Yes
