Text preview for : 4_30a.pdf part of Panasonic VDR-M70 Panasonic VDR-M50 and VDR-M70 Service manual
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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-M70PP/M50PP to a service position that matches the symptom. There are four service positions (A)-(D) for VDR-M70PP/M50PP. 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-M70PP/M50PP. 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-M70PP/M50PP 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.