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The LED lights don't work -- I think it needs a new drive transistor, or something.
OK - the owner tried to re-solder the connector and made things a lot worse.
It looks like he may have shorted one of the wires to ground.
The -40 volt cap (6000µ/50V) has black burn marks on it, and it measures in the millivolts most of the time, but if I wait and press the test lead, it eventually goes to -42V. The +40V measures +42 and is steady.
So, the main problem appears to be the negative side of the DC voltage.
Both big caps (6000µ/50V) test fine using the resistance method, which makes me suspect the bridge diode, which seems to need to be disconnected (un-soldered) to test properly. I'll do that tomorrow.
Any ideas?
Thanks!!
OK - the owner tried to re-solder the connector and made things a lot worse.
It looks like he may have shorted one of the wires to ground.
The -40 volt cap (6000µ/50V) has black burn marks on it, and it measures in the millivolts most of the time, but if I wait and press the test lead, it eventually goes to -42V. The +40V measures +42 and is steady.
So, the main problem appears to be the negative side of the DC voltage.
Both big caps (6000µ/50V) test fine using the resistance method, which makes me suspect the bridge diode, which seems to need to be disconnected (un-soldered) to test properly. I'll do that tomorrow.
Any ideas?
Thanks!!