Troubleshooting - Sharp MD-S301 Service Manual

MD-S301/S301W
It is advisable to use the TEST mode (refer to Error Data Display Mode, P22) 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 does not function
When the CD section does not operate 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 isopropyl alcohol.
Do not touch the lens with the bare hand.
Is power turned on when the remote control
main unit button is pressed?
Does display operate normally?
Is playback state set?
Is audio output normal?
• Power is not turned on when the
is pressed.
Is power turned on when the remote control
pressed?
Is operation normal when the main unit button is used?
Is the pin 43 of IC401 in "H" state?
Is clock supplied to the pins 11 and 14 of IC401?
Is 2.5V output to TP811?

TROUBLESHOOTING

button or
Yes
Yes
Yes
/ button
button is
No
No
Yes
Yes
Check asstated in "Power is not turned on when the
No
button is pressed".
Check as stated in "Indication is not normal"
No
Check as stated in "Playback state cannot be set".
No
Check as stated in "Audio playback circuit"
No
Check the periphery of remote control unit and main unit
Yes
headphone terminal (J701) IC401.
Check the position of HOLD switch.
No
Check whether voltage is output around IC403.
No
Check whether there is solder touch on the part connected
No
to the +2.5V line.
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