Sharp MD X5 Service Manual download pdf (Page 69)

– 69 –

MD-X5H/CP-X5H

TROUBLESHOOTING (CD SECTION)

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 cannot be opened or closed.

Is the following voltage input in the specific IC901 pins 86 and

87 state?

Open state: 86=0V, 87=5V

Close state: 86=5V, 87=0V

Is H output to the IC2 pin 27 or pin 28 for 7 seconds when

the OPEN/CLOSE button is pressed? IC91 is defective.

Is 4V output between IC91 pin 3 and pin 7 during operation

above?

Yes

Check the OPEN CLOSE switch and the wiring from the IC901

pins 86 and 87 to the OPEN CLOSE switch.

• The CD function does not operate.

The CD operation button fails to operate.

Yes

Check the wiring of IC2 pin 27, pin 28, IC91 pin 1 and pin 9.

Yes

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

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

terminal.

IC2 is defective.

Yes

Check the periphery of IC91.

IC91 is defective.

Yes

Check the loading motor and loading mechanism.

Yes

If OK, check the main microcomputer IC901.

Check whether the pickup is in the PICKUP IN switch

position.

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 103 104

No comments

Sharp MD X5 Service Manual Page 69