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M500T Carver help?
M500T Carver help?
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Old 11th January 2019, 01:44 PM   #31
T3GTerry is offline T3GTerry
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R119 = 12.27vdc
R121 = 12.59vdc
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Old 11th January 2019, 06:02 PM   #32
llwhtt is offline llwhtt  United States
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Not sure where to go from here, how about B-E voltages on Q101 and Q103.

Craig
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Old 12th January 2019, 03:05 AM   #33
T3GTerry is offline T3GTerry
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Bv Q101 = 70.2vdc
Ev Q101 = 1.64vdc

Bv Q103 = -70.9vdc
Ev Q103 = -1.72vdc
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Old 12th January 2019, 05:14 PM   #34
llwhtt is offline llwhtt  United States
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Measure directly across the B-E junction, one probe on the Base and one probe on the Emitter. I think the high voltage in your last measurement is the collector.
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Old 13th January 2019, 05:32 AM   #35
anatech is offline anatech  Canada
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M500T Carver help?
Hi Terry,
Can you do a quick check for me? Put the common lead from your meter into the bad channel's speaker output terminal. Then measure to the output emitters and then the base connections. Repeat for the drivers. The reason your common lead is in the speaker hot output is so that you can get a true measurement of these voltage drops. You will notice that your readings are more stable. OF course, your readings are taken with no signal at all and no load connected.
Quote:
R123 = .04vdc
R125 = .06vdc
R131 = .04vdc
R133 = .06vdc
I noticed that your readings were useless. You need to be able to measure at least to 0.1 mV in order to be able to set the bias current. What meter are you using? Do you have the manual, or just the schematic?

Now, when you look at the sine wave output with your 'scope, what does it look like? Can you attach a picture of the screen?

I know this is all basic stuff, but I'd like to have a clear idea of what is going on in that output circuit.

-Best, Chris
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