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MD-MT180
TROUBLESHOOTING
It is advisable to use the TEST mode (refer to Error Data Display Mode, P14) indicating the causes of troubles before
starting repair. Causes of operation errors (up to 10 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 main unit button
is pressed?
No
Perform the check stated in item "Power is not turned on
when the PLAY button is pressed".
Perform the check stated in item "Abnormal display".
No
Yes
Does the display operate normally?
Is playback state set?
Yes
Perform the check stated in item "Playback state cannot be
set".
No
Is audio output normal?
Yes
Perform the check stated in item "Audio playback circuit".
No
Is recording/playback operation normal?
Yes
Perform the check stated in item "Recording/playback
operation".
No
• Abnormal display
No
Yes
Are the pin 7 (VCC) and pin 6 (GND) normal?
Is waveform output from IC401 pins 9,11,13?
Is waveform output from CN482 pins 1 to 3?
Yes
Check between IC401 and
CN482.
No
Check the periphery of IC401.
Check for pattern breakage of flexible PWB, check for
defects of display microcomputer (replace the display unit).
