Service manual

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MD-SR50H/50W/60E/60W
TROUBLESHOOTING
It is advisable to use the TEST mode (refer to Error Data Display Mode, P19) 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 the power supply turned on when the remote control
button or 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 connot 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
• Power is not turned on when the / button is
pressed.
No
No
Yes
Check the periphery of remote controller and main unit
headphone terminal (J703) and IC401.
No
Is the pin 95 of IC401 in H state? (TP404)
Is operation normal when the main body button is pressed?
Check the position of Hold switch.
Is power turned on when the remote control button is
pressed?
No
Does the pin 66 of IC401 oscillate? (TP400)
Replace XL401.
Yes