There are no diagrams, even for MTH techs. Those appear to be a closely guarded secret.
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There are no diagrams, even for MTH techs. Those appear to be a closely guarded secret.
If that is the small PCB board with 3 wires, red or green, yel and black that is a small 352A transistor part of the charging circuit. I have not invested the time in tracking PS-2 5V other than the basics. You can't get to the parts or you will find obsolete parts.
I think MTH was refurbing at one point, but they were still failing.
In general, AC is rectified for PV and also for PV for the 5VDC regulator. Once you know you have good DC voltage out of the rectifier, every thing else is checked against the PCB DC Ground with is battery negative, and the blue wire pins.
Any testing against the AC Reference of outer rail will toast all the DC electronics, or at least most of them. G
If that is the small PCB board with 3 wires, red or green, yel and black that is a small 352A transistor part of the charging circuit. I have not invested the time in tracking PS-2 5V other than the basics. You can't get to the parts or you will find obsolete parts.
I think MTH was refurbing at one point, but they were still failing.
In general, AC is rectified for PV and also for PV for the 5VDC regulator. Once you know you have good DC voltage out of the rectifier, every thing else is checked against the PCB DC Ground with is battery negative, and the blue wire pins.
Any testing against the AC Reference of outer rail will toast all the DC electronics, or at least most of them. G
It is a fet, when you say shorted to the outer leg, do you mean the tab? The center non attached leg is the same as the tab. If it is shorted to one of the other legs that is a short on the FET. I suspect that is one of the FETs that goes bad. Hard to get to without separating the board, which is more trouble than worth in my opinion. G
It is a fet, when you say shorted to the outer leg, do you mean the tab? The center non attached leg is the same as the tab. If it is shorted to one of the other legs that is a short on the FET. I suspect that is one of the FETs that goes bad. Hard to get to without separating the board, which is more trouble than worth in my opinion. G
It is a fet, when you say shorted to the outer leg, do you mean the tab? The center non attached leg is the same as the tab. If it is shorted to one of the other legs that is a short on the FET. I suspect that is one of the FETs that goes bad. Hard to get to without separating the board, which is more trouble than worth in my opinion. G
Did you separate the board? Try a LR2905 G
I'm curious how you separated the 5V board set without wrecking them!
I'm curious how you separated the 5V board set without wrecking them!
I'm curious how you separated the 5V board set without wrecking them!
I've never been patient enough to separate them.
Order the LR2905 from digi key. Some boards have shorted pins and seems like they can come apart, others won't work that easily as you bend pins and damage the internal traces.
I think you need to put the part back on, and hopefully it will work, but who knows you may have some other fault that caused the fet to go. Like a short on an internal trace. Which happens a lot on 3V processor boards. G
Order the LR2905 from digi key. Some boards have shorted pins and seems like they can come apart, others won't work that easily as you bend pins and damage the internal traces.
I think you need to put the part back on, and hopefully it will work, but who knows you may have some other fault that caused the fet to go. Like a short on an internal trace. Which happens a lot on 3V processor boards. G
I understand what you are doing, I am just saying don't be surprised if something else is the real culprit of the failed fet.
I've never been patient enough to separate them.
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