Sharp MD-S301 Service Manual

MD-S301/S301W
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• "Audio playback circuit"
When sound is not output although playback time display advances during continuous playback.
No
Is audio waveform observed on the pins 14 and 16 of
IC501?
Check the pins 70 to 72 and 74 of IC201, pins 1 to 3 and 6 of
IC501.
Yes
Is audio waveform observed on the pins 1 and 7 of IC701?
No
Yes
Is audio waveform observed on the pins 3 and 4 of J701?
No
Is mute applied?
Check whether the level of pin 67 of IC401 is High.
Check periphery of headphone jack and headphone.
Yes
Check the pins 3 and 5 of IC701, pins 3 and 13 of IC702.
• "Spindle motor fails to rotate"
Is waveform observed on the pins 24 and 25 of IC201 at the
focus gain rough adjustment step?
Check periphery of IC201.
No
Is waveform observed on the pin 24 of IC601?
Yes
Replace IC601.
No
Is waveform observed on the pins 13 and 17 of IC901?
Yes
Check solder joint of L609, IC201, IC901, CN601, flexible PWB.
No
Yes
Replace the spindle motor.
No
Check the lead-in switch SW901, solder joint of mechanism
flexible PWB, pin 15 of CN601.
• "Normal playback"
Is initialization performed normally in the high-reflection
disc playback mode?
When the address up to the cluster address has been proved to be normal in the TEST mode.
Yes
No
Does playback time advance?
Check IC201, IC202 connection line.
No
Is the lead-in switch turned on when the optical pickup is
moved to the innermost periphery in the NORMAL mode?
(Is the level of pin 98 of IC401 Low?)
Is an attempt to read repeatedly the TOC part made on the
low-reflection disc?
No
Replace disc.
Check position in the "INNER" mode.
Yes
Yes

Sharp MD-S301 Specifications

General

Brand	Sharp
Model	MD-S301
Category	MiniDisc Player
Language	English