Anyone with a Carver PM-175 Diagram? - diyAudio
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Old 17th May 2003, 12:23 AM   #1
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Default Anyone with a Carver PM-175 Diagram?

I'm fixing a Carver PM-175 for a friend.

The amp almost works, but hums in one channel and has bad distortion in the other.

Does anybody have a diagram for this model or know where
I could get one?

Thanks.

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Old 17th May 2003, 04:57 AM   #2
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Check for bad outputs and drivers on the channel with distortion.

Then check the power supply diodes, particularly on the two lower voltage tiers. They frequently have 3A diodes, replace with 6A types.

There may be nothing wrong with the channel that has hum, fix the others things first.
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Old 17th May 2003, 05:36 AM   #3
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Okay...

I'll try that and see what I can do with it.

Still, does anybody have a schematic? I'd really like to see the
design of this thing...


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Old 17th May 2003, 09:22 PM   #4
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Okay, I've completely checked every output transistor and driver and they all seem okay. Also, the lower tier PSU's are absolutely fine.

Is it possible that an opamp might be fried? There was actually a trace from a lower tier PSU that was fried. It seems to go from the common pole of the PSU to the opamps and some other stuff in the chain, such as the input circuitry.

Please, if anybody has the diagram for it, it would really help!

Thanks

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Old 18th May 2003, 03:25 AM   #5
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Vaporized ground traces?

Sounds like it had 120V on the input, stuff happens.

This usually comes in on the shield from another piece of equipment with a line phase reversal switch, like a guitar amp.

Try replacing everything on the balanced input card, usually mounted to the input jacks.

I used to work for a Carver authorized service center, but no longer have access to the schema, sorry.
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Old 19th May 2003, 07:44 AM   #6
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It doesn't have a seperate balanced input card. The whole works is mounted on the main board. I see that one of the opamps is fried so I'm going to replace it.

I'll get back with whatever else I see.
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Old 19th May 2003, 09:15 AM   #7
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Default Re:Carver PM 1.5 Schema

Hi Duo

I'm not sure if this will help but I have a Carver PM1.5 schematics.
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Old 19th May 2003, 11:15 AM   #8
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Hello MCP,

Can you email me this schematic or put on here???
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Old 19th May 2003, 11:44 AM   #9
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Duo,


Just a stupid question: have you asked Carver for a schematic?

I wonder what their policy is, but maybe they can help you.


Carlos
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Old 19th May 2003, 01:16 PM   #10
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Hi ACD,

No problems. Just send me a mail.

Regards
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