DRMH 200SEK JVC DVD HDD recorder power supply fault
Posted: Mon Sep 01, 2008 9:44 pm
I aquired this hdd recorder with a report of a blown fuse. I was going to salvage the 160g hdd but when I opened the machine it all looked in very good condition except for an indication of slight overheating at IC 5101 which had one pin fused. All the capacitors looked good with no leaks or bulges
I decided to try and repair the machine. The following items were clearly defective
IC5101
F5001
R5109
I also replaced C5103,R5107. R5108 tested OK so I did not replace it. I did not have a replacement for the opto coupler PC5101 but I think it is OK?
After replacing these items I powered the machine up and all that happens is that the front panel leds on the HDD and DVD pushbuttons flash at about 2hz. There is also a faint ticking noise from the PSU transformer area.
I noted the following voltages at the positive terminals of the smoothing capacitors
C5307 -- 8.6V
C5308 -- 8.5V
C5306 -- 15.7V
C5305 -- 15.3V
C5304 -- 15.7V
C5303 -- 12.6V
I checked for ripple with a rather doubtful oscilloscope and did not detect significant ripple.
There are zero volts on the 12V and 5v headers for the HDD and the DVD drive.
A circuit diagram of the power supply might be useful but I have now got to the point of wondering if it is worth investing further and should I go back to my origonal aim and just salvage the HDD and forget about the challenge of getting this unit to work.
Has anyone got any ideas as to what I should do next?
I decided to try and repair the machine. The following items were clearly defective
IC5101
F5001
R5109
I also replaced C5103,R5107. R5108 tested OK so I did not replace it. I did not have a replacement for the opto coupler PC5101 but I think it is OK?
After replacing these items I powered the machine up and all that happens is that the front panel leds on the HDD and DVD pushbuttons flash at about 2hz. There is also a faint ticking noise from the PSU transformer area.
I noted the following voltages at the positive terminals of the smoothing capacitors
C5307 -- 8.6V
C5308 -- 8.5V
C5306 -- 15.7V
C5305 -- 15.3V
C5304 -- 15.7V
C5303 -- 12.6V
I checked for ripple with a rather doubtful oscilloscope and did not detect significant ripple.
There are zero volts on the 12V and 5v headers for the HDD and the DVD drive.
A circuit diagram of the power supply might be useful but I have now got to the point of wondering if it is worth investing further and should I go back to my origonal aim and just salvage the HDD and forget about the challenge of getting this unit to work.
Has anyone got any ideas as to what I should do next?