Hi,
I have an unexplained fetish for Sherwood products. I know they are far from brilliance, but as i said it's a fetish.
I have had a broken CD player in the storage for a few years that I tried to fix several times and didn't have any success. About a month ago I decided to look for a full service manual for it. I found and bought one.
A few days later the player was playing and I was VERY happy with it.
All it took was to go through the proper alignment procedure, this was quite easy having the related documents.
In order to squeeze a little more out of it I replaced two main caps on the PS and changed the diodes to 1n5819 fast recovery diodes (this may have to do with the problem ?)
The CD worked like a charm for something like 4-5 days strait and I left it switched on and returned to my regular CD player.
About a week has passed and I found it today with no life signal:
1) When switching on only the LCD back-light lights up.
2) No keys action - on any key (door won't open, play will not play - nothing).
3) No laser action, at all.
4) On the power supply diodes seem to be in perfect working order.
5) I can measure +5VDC -5VDC out of the PS at the regulators and on various ICs on the PCB.
I have expected it to be PS related but the PS seems to be fine. I'm running out of ideas, could it be the CPU ? How do I go about checking the CPU ? What else can it be ?
As I said, I have a full service manual for this machine. I will gladly send it to anyone interested or willing to help.
Please help ...
I have an unexplained fetish for Sherwood products. I know they are far from brilliance, but as i said it's a fetish.
I have had a broken CD player in the storage for a few years that I tried to fix several times and didn't have any success. About a month ago I decided to look for a full service manual for it. I found and bought one.
A few days later the player was playing and I was VERY happy with it.
All it took was to go through the proper alignment procedure, this was quite easy having the related documents.
In order to squeeze a little more out of it I replaced two main caps on the PS and changed the diodes to 1n5819 fast recovery diodes (this may have to do with the problem ?)
The CD worked like a charm for something like 4-5 days strait and I left it switched on and returned to my regular CD player.
About a week has passed and I found it today with no life signal:
1) When switching on only the LCD back-light lights up.
2) No keys action - on any key (door won't open, play will not play - nothing).
3) No laser action, at all.
4) On the power supply diodes seem to be in perfect working order.
5) I can measure +5VDC -5VDC out of the PS at the regulators and on various ICs on the PCB.
I have expected it to be PS related but the PS seems to be fine. I'm running out of ideas, could it be the CPU ? How do I go about checking the CPU ? What else can it be ?
As I said, I have a full service manual for this machine. I will gladly send it to anyone interested or willing to help.
Please help ...
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