4.7. TROUBLE DIAGNOSIS
Information:
1) Use the VFK0631 adapter/charger to power VDR-M70/M50 for trouble diagnosis.
2) The trouble diagnosis table was prepared presupposing that the circuit boards have been
normally attached and connected. Therefore, make sure beforehand that the circuit boards are
correctly connected, that connectors and cables are not damaged, and that the status of their
connections is correct.
Prohibition:
During trouble diagnosis, never look directly into the objective lens of optical pickup block in disc drive
unit, and take great care that the reflected laser beam does not enter your eye.
4.7.1. Trouble diagnosis table
Interpreting the trouble diagnosis table:
1) Search for the defective symptom. If there are multiple check points or multiple details of check
for one symptom, check the items from the top down.
2) Set the VDR-M70/M50 to a service position that matches the symptom. There are four
service positions (A)-(D) for VDR-M70/M50. Set to the appropriate service position,
referring to “Disassembly/reassembly to enable service position”.
If only dashes — are entered in the service position column, trouble diagnosis is possible without
disassembling the VDR-M70/M50.
3) Connect the measurement terminals to the check points, and collate the results with the details
of check.
Letters in brackets [ ] that follow the check points show the name and side of circuit board.
Example: [MAN-A] shows that the check point exists on side A of MAN-H/MAN circuit board.
Information:
The MAN-H/MAN or AEL-H/AEL circuit board has some check points to which no terminals of test
equipment can be directly connected even when the VDR-M70/M50 is set to a service position.
Solder a lead wire of approx. 10 cm to such check points, referring to “Disassembly/reassembly to
enable service position” and “circuit board diagrams”. When trouble diagnosis is complete, be sure
to remove the lead wire.
4) Perform troubleshooting according to the check results, referring to the troubleshooting columns.
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VDR-M70EG / VDR-M70EB / VDR-M70GC / VDR-M50EG / VDR-M50EB / VDR-M50GC
