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MD-MT88H/99H
• 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 43?
Does waveform appear on IC901 pins 1, 2 and 23?
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?
No
Does level of pins 86 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,
head, flexible PWB.
No
Yes
Is audio monitor output given in normal mode LINE IN
record?
Check waveforms of pins 8,10,11,12 of IC501, pins 70 to 73 of
IC201.
Is waveform obtained on IC501 pins 2 and 3?
No
Yes
Check whether the pin 13 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 8 and 17 of IC703?
Yes
Check whether input waveform is observed on the pins 4
and 21 of IC703.
Yes
Check voltage of pins 52 and 53 of IC201, pins 3, 4, 7, and 9 of
IC651, pins 1 and 2 of CN601. Check whether disc is record-
inhibited.
Does the RF waveform appear at TP201 (When monitoring
the RF waveform, set to MSL:88H using the control setting
item of EEPROM) when recording/Playback is performed
