Sharp MD-MT270HS/BK, Руководство по обслуживанию

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MD-MT270H
• Recording/playback operation.
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 69 of IC401 and pin 2 of change
depending on record and playback ?
Is RF pattern output from IC201 pin 36, 37 ?
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 head, flexible PWB.
No
No
Check the periphery of IC501 and the waveform of the pins
97, 100, 101, 102 of IC201.
No
Check whether the audio signal line between IC501 and J701 is
defective. Check whether input waveform is observed on the pins 3
and 4 of IC501.
Yes
Check voltage of pins 89 and 90 of IC201, pins 17, 18, 20, and
21 of IC601, pins 8 and 9 of CN601. Check whether disc is
record-inhibited.
Does the RF waveform appear at TP201 when recording/
Playback is performed.
Check whether the pin 16 of IC501 and the pin 108 of IC201 are
in H state.
Yes
Yes
Is the output waveform output to the pin 9 of IC501 ?
Change MSL from 00H to 80H by the control setting of EEPROM. After completing the operation, return in to 00H.
Insert a low reflection disc, and ascertain audio output by normal playback, and then set TEST REC mode.