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Folsom EC7293: PVI Powered Frontend, 60/120w 8/4ohm
Folsom EC7293: PVI Powered Frontend, 60/120w 8/4ohm
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Old 12th September 2020, 08:41 PM   #281
yardbird is offline yardbird
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Here tis-
L- 69.3v at PS, 7.52v at PVI, 23.95 at the resistor, DC OS- 0.0002v
R- 69.2v at PS, 7.47v at PVI, 23.95 at the resistor, DC OS- 0.299v

Couldn't get a solid measurement across the LED pins on either board. The R seemed to be making good contact but would not settle down.

Not sure why the regulator on the R is getting hotter (140 vs 98F). I'll reseat the heat sink.
JG

Last edited by yardbird; 12th September 2020 at 08:43 PM.
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Old 14th September 2020, 04:12 AM   #282
Destroyer OS is offline Destroyer OS  United States
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Folsom EC7293: PVI Powered Frontend, 60/120w 8/4ohm
Are the negative and positive voltages the same?
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Old 14th September 2020, 07:57 PM   #283
Destroyer OS is offline Destroyer OS  United States
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Folsom EC7293: PVI Powered Frontend, 60/120w 8/4ohm
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Old 15th September 2020, 04:21 PM   #284
yardbird is offline yardbird
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I got 35.3 to negative and 35.5 to positive on both channels.
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Old 16th September 2020, 03:55 AM   #285
Destroyer OS is offline Destroyer OS  United States
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Folsom EC7293: PVI Powered Frontend, 60/120w 8/4ohm
Any hot caps on either regulator board?

Carefully look for any burnt traces as well please.

Last edited by Destroyer OS; 16th September 2020 at 04:15 AM.
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Old 16th September 2020, 04:21 AM   #286
Destroyer OS is offline Destroyer OS  United States
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Folsom EC7293: PVI Powered Frontend, 60/120w 8/4ohm
If you touch the input wires/connections on RCA, do you get AC on output? (hum)

As for offset, measure voltage to ground after the input cap, at pins 2 and 3 of first chip, and at the top ends of the 3,3k resistors above the dc trim pot.

Last edited by Destroyer OS; 16th September 2020 at 04:28 AM.
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