Sharp MD-MS200W Service Manual page 38

MD-MS200W/MD-MS200/MD-MS200H
• Abnormal display
Is waveform output from CNS 402 pins 1 to 3?
Are the pin7 (VCC) and pin 6 (GND) normal?
Check for pattern breakage of flexible PWB, check for
defects of display microcomputer (replace the display unit).
• Playback state cannot be set
Is playback state unsettable for high reflection disc and low
reflection disc?
Only the high reflection disc cannot be played back.
Is the pin 46 of IC401 in L state when the high reflection disc
is inserted?
Is the pin 51 of IC401 and pin 23 of IC101 in L state?
Proceed to "Test mode check".
Only the low reflection disc cannot be played back.
Is the pin 46 of IC401 in L state when the high reflection disc
is inserted?
Is the pin 51 of IC401 and pin 23 of IC101 in L state?
Proceed to "Test mode check".
Yes
No
Yes
Yes
Yes
Yes
Is waveform output from IC 401 pins 13 to 15?
No
Yes
Check between IC401 and
CNS402.
Proceed to "Test mode check".
Yes
Check SW902, mechanism flexible PWB and CN601.
No
Check SW902, mechanism flexible PWB and CN601.
No
– 38 –
No
Check the periphery of IC401.