CASIO PZ-7
Instrukcja Serwisowa

Repair Item 2-A

A

! Note: Connect GND to door switch by removing the top cabinet. Than open the top cover and check the radiation power with an optical power meter. If an optical power meter is not available, watch the radiation through the lens of the pickup unit at a minimum distance of 30 cm from the pickup unit.

!
Does the LASER emit ?

No

A1

Yes

!
Does the lens moves up and down ? Yes Load a disc and close the CD door. Then check the following.

No

A2

E = more than 0.9 V

Is the waveform at testpoint IRF like that shown in fig. 2 ?

No

* Check flexible PCB connect. * Check soldering for IC101, IC102 and IC103. * IC101, IC102 or IC103 is defective. * Pickup is defective.

Figure 2

Yes

>1.5

Is the waveform at IC102 pin 1 (FEO) like that shown in fig. 3 ?

No

* Check circuit between IC102 pins1 and 2. * IC102 is defective.

Figure 3

Yes

Is the waveform at IC102 pin 45 (TEO) like that shown in fig. 4 ?

No

* Check flexible PCB connect. * IC102 is defective. * Check circuit around TE line.

Figure 4
* IC102 is defective.

Yes

* Pickup unit is defective.

6