Troubleshooting - Sharp MD-MT877S Service Manual

MD-MT877/MD-MT877C
Use the test mode which indicates trouble causes before repairing the unit. This mode records maximum 2 past error
causes as codes. Refer them for repairing.
Preparations
If dusts and foreign materials are accumulated on the pickup lens, playback sounds can be skipped or the TOC (Table of Contains)
can't be displayed. Clean the object lens and check the playback. When lens are dirty, do the following.
Turn off the power and wipe lens softly with a cleaning paper and a little marketing so as not to damage them.
Do not touch lens with bare hands.
If the unit doesn't work.
If the unit doesn't start after cleaning the pickup objects lens lens, check the unit as follows.
Is the power supply turned on when the remote control
button or main unit button is pressed ?
Does the display operate normally ?
Is playback state set ?
Is audio output normal ?
Is recording/playback operation normal ?
• Power is not turned on when the
pressed.
Is power turned on when the remote control
pressed ?
Is operation normal when the main body button is pressed ?
Does the pin 63 of IC401 oscillate ?

TROUBLESHOOTING

Yes
Yes
Yes
Yes
/ button is
No
button is
No
No
Perform the check stated in item "Power is not turned on
No
when the
Perform the check stated in item "Abnormal display".
No
Perform the check stated in item "Playback state cannot be
No
set".
Perform the check stated in item "Audio playback circuit".
No
Perform the check stated in item "Recording/playback
No
operation".
Yes
• If "HOLD" appears, press and hold down STOP on
the main unit and cancel the HOLD mode.
Yes
Normal.
Check the remote control, headphone terminals on the
Yes
main unit (J703), IC401 and IC404.
Replace XL401.
No
– 38 –
/ button is pressed".