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• Recording/playback operation
Insert a low reflection disc, and ascertain audio output by normal playback, and then set TEST REC mode.
Change MSL from 00
to 80
H
Does the head move down, failing to start record even when
the continuous record mode is set after address ?
Does the RF waveform appear at TP201A when recording/
Playback is performed ?
Does level of pin 2 of IC401 change depending on record and
playback ?
Is RF pattern output from IC201 pins 36 and 37 ?
Check whether there is any damage in IC101, periphery of
laser diode.
Check for defects of IC351, IC353, IC354 and D351 in head
drive, flexible PWB.
Check whether input waveform is observed on the pins 6 and
7 or pins 16 and 17 of IC701.
Is audio waveform observed on the pins 1 and 19 of IC701 ?
Does a digital waveform appear in pins 9 to 12 of IC501 ?
Check the periphery of IC501 and the waveform of the pins
97 and 100 to 102 of IC201.
by the control setting of EEPROM. After completing the operation, return in to 00
H
Yes
No
Yes
Yes
Enter the normal recording mode.
Yes
Yes
Yes
Check voltage of pins 90 and 91 of IC201, pins 17, 18, 20, and 21
No
of IC601, pins 8 and 9 of CN601.
Check whether disc is record-inhibited.
Yes
Check for soldering failure of IC401 .
No
Check for soldering failure of IC201 .
No
Check whether the audio signal line between IC701, J701 and
No
J702 is defective.
When pressing the VOLUME +/- button in the recording mode and
No
check if a pulse waveform appears in pins 3 to 5 of IC701. If not,
even after soldering IC701, replace it.
Check whether the pin 13 of IC501 and the pin 108 of IC201 are in
No
H state.
– 43 –
MD-DR470H/MD-DR480H
.
H
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