Hey guys so I got in my first power 1000 I've never seen one in person. Now the problem is no audio from all four channels. This amp does turn on and if volume on source is all the way up it'll play some audio that is broken up or distorted at max volume on source. What should I check? I also checked all output mosfets none appear to be shorted.
Attachments
I have the following:
LM833N #1
1.105v
065.01mV
064.2mV
-16.83v
2.521v
1.213v
061.3mV
061.8
LM833N #2
-2.056v
-466.1mV
-466.3mV
-16.83v
2.523v
272.8mV
136.5mV
135.8mV
LM833N #1
1.105v
065.01mV
064.2mV
-16.83v
2.521v
1.213v
061.3mV
061.8
LM833N #2
-2.056v
-466.1mV
-466.3mV
-16.83v
2.523v
272.8mV
136.5mV
135.8mV
The supply voltage feeding the regulator is too low. There may be another problem because the supply voltage on pin 8 was well below the 5.7v output of the regulator.
Check the diodes feeding pin 1 of the regulator.
Check the diodes feeding pin 1 of the regulator.
I would guess that two of the blue/white diodes with the striped end connected to pin 1 of the regulator.
What's the DC voltage on all terminals of the 7918? Black probe on tab of 7818.
What's the DC voltage on all terminals of the 7918? Black probe on tab of 7818.
That regulator is powered from the same supply as the 7818 so the problem is likely a corroded trace, bad solder connections or possibly defective rectifiers.
Are the measurements from the Lm833n similar to the other pair? I have not checked those yet. Approximately what does a good rectifier check out on diode check on the meter?
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