Troubleshooting - Sharp MD-MT80W(S) Service Manual

It is advisable to use the TEST mode (refer to Error Data Display Mode, P18) indicating the causes of troubles before
starting repair. Causes of operation errors (up to 16 errors) are recorded as error codes. This information is useful
for repair.
When MD playback does not function
When the objective lens of the optical pickup is dirty, this section may not operate. Clean the objective lens, and check the playback
operation. When this section does not operate even after the above step is taken, check the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC (Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup
lens. Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."
Turn the power off.
Gently clean the lens with a lens cleaning tissue and a small amount of lens cleaner on the market.
Do not touch the lens with the bare hand.
Is the power supply turned on when the remote control
button (90W/90/90C) or main unit
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
button is pressed.
Is power turned on when the remote control
(90W/90/90C) is pressed?
Is operation normal when the main unit
Does the pin 66 of IC401 oscillate?

TROUBLESHOOTING

button is pressed?
Yes
Yes
Yes
Yes
/ (90W/90/90C)
button
No
button is pressed?
No
Perform the check stated in item "Power is not turned on
No
when the PLAY button is pressed".
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".
• If "HOLD" appears, press and hold down STOP on
the main unit and cancel the HOLD mode.
Check the periphery of remote controller (90W/90/90C) and
Yes
main unit headphones terminal (J703) and IC401.
Replace XL401.
No
– 39 –
MD-MT80W/90W/90/90C