Troubleshooting (Cd Section) - Sharp MD-X60 Service Manual

Table of Contents

MD-X60

When the CD 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.

• The CD tray fails to operate.

Check the changer mechanism cam switch (SWB101 to

SWB104) and tray switch (SWB105 to SWB108).

Check whether state changes to Low when

IC901 pin 29 to 36 and cam SW1 (SWB 105 to SWB 108)

is on.

pin 30 cam SW2

pin 31 cam SW3

pin 32 cam SW4

is on.

Check whether state changes to Low when

IC901 pin 33 tray SWA.

pin 34 cam SWB

pin 35 cam SWC

pin 36 cam SWB

is on.

ICheck whether output of pins 3 and 7 of main cam motor

driver IC92 is normal.

Check whether the output of pins 3 and 7 of tray motor driver

IC91 is normal.

Check the motors MOB1 and MOB2.

• The CD function will not work.

The CD operating keys don't work

Yes

Check the CD, DSP, power supply, and 16.93 MHz clock and

reset terminal IC2 pin 68.

Yes

Check the waveform of SCK, SO (DATA) and SI (COMM).

Check the waveform of IC2 pin 65 (SQOUT), pin 66 (COIN), and

pin 67 (CQCK).

Yes

Check that the pickup is in the PICKUP IN switch position of

SW702A.

Yes

If the items mentioned above are OK, check the main

microcomputer IC901.