Search found 7 matches

by byacey
Sat May 14, 2016 5:57 pm
Forum: CARVER Equipment Repair/Help Forum
Topic: pm1200 losing bass output
Replies: 7
Views: 5112

Re: pm1200 losing bass output

The PM1200 has a bridging switch inside between the input connectors. If this is pressed in, it will reverse the phase on one of the channels.
by byacey
Sat May 14, 2016 5:52 pm
Forum: CARVER Equipment Repair/Help Forum
Topic: PM125 / PM420 schematics
Replies: 1
Views: 2231

PM125 / PM420 schematics

For a few years I've been looking for schematics for a pm125 and a pm 420, but it's as if these amps never existed. Does anyone have any info on these? I own more than a few and I'm sure they'll eventually need some work.
by byacey
Mon Apr 25, 2011 11:50 am
Forum: CARVER Equipment Repair/Help Forum
Topic: PM 1.5 that just won't quit--turn off
Replies: 5
Views: 1289

Re: PM 1.5 that just won't quit--turn off

I was reading through some of the old threads and saw another older post similar to this. Anyone that has a PM1200, PM1.5, PM1800, PM2400 etc. That doesn't power down, I would advise getting the amp in to a qualified service shop. If the transformer phase control triac shorts , then the transformer ...
by byacey
Mon Apr 25, 2011 11:27 am
Forum: CARVER Equipment Repair/Help Forum
Topic: PM 1.5 that just won't quit--turn off
Replies: 5
Views: 1289

Re: PM 1.5 that just won't quit--turn off

Check the power supply Triac if it's shorted.
by byacey
Mon Apr 25, 2011 11:18 am
Forum: CARVER Equipment Repair/Help Forum
Topic: Help with dead PM-1200
Replies: 4
Views: 1178

Re: Help with dead PM-1200

These transformers can be rewound by someone with experience. It's important to get the windings tight and use really thin cambric film as there isn't a lot of room in the core window opening.
by byacey
Wed Apr 13, 2011 11:30 am
Forum: Carver Pro
Topic: Schematic for PM125
Replies: 3
Views: 2729

Re: Schematic for PM125

Hi, Thanks for the nice welcome. I've had quite a bit of experience working on the PM2400, PM1800, PM 1200/1.5, PT1250 , but I haven't had any experience with these smaller amps. I'm thinking it's probably just a conventional single split rail design.
by byacey
Tue Apr 12, 2011 12:30 pm
Forum: Carver Pro
Topic: Schematic for PM125
Replies: 3
Views: 2729

Schematic for PM125

Hi, I'm looking for a schematic for a PM125. I bought a used one recently that works great, but I like to have schematics on hand for all my equipment when the need for repair arises. I haven't opened this amp yet, so I don't know if the power supply is conventional, or phase controlled like the lar...

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