Anyone with a Carver PM-175 Diagram?

Duo · 16th May 2003, 11:23 PM

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.

-- Duo.

djk · 17th May 2003, 03:57 AM

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.

Duo · 17th May 2003, 04:36 AM

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...

-- Duo.

Duo · 17th May 2003, 08:22 PM

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

-- Duo.

djk · 18th May 2003, 02:25 AM

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.

Duo · 19th May 2003, 06:44 AM

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.

mcp · 19th May 2003, 08:15 AM

Hi Duo

I'm not sure if this will help but I have a Carver PM1.5 schematics.

Jan Dupont · 19th May 2003, 10:15 AM

Hello MCP,

Can you email me this schematic or put on here???

carlmart · 19th May 2003, 10:44 AM

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

mcp · 19th May 2003, 12:16 PM

Hi ACD,

No problems. Just send me a mail.

Regards

16th May 2003, 11:23 PM	#1
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	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. -- Duo. __________________ -- Duo, W1ngs, VA7MON, and lesser known handles. -- -- http://www.w1ngselectronics.com -- My Work and Projects --

17th May 2003, 04:36 AM	#3
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	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... -- Duo. __________________ -- Duo, W1ngs, VA7MON, and lesser known handles. -- -- http://www.w1ngselectronics.com -- My Work and Projects --

17th May 2003, 08:22 PM	#4
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	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 -- Duo. __________________ -- Duo, W1ngs, VA7MON, and lesser known handles. -- -- http://www.w1ngselectronics.com -- My Work and Projects --

19th May 2003, 06:44 AM	#6
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	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. __________________ -- Duo, W1ngs, VA7MON, and lesser known handles. -- -- http://www.w1ngselectronics.com -- My Work and Projects --

19th May 2003, 08:15 AM	#7
mcp diyAudio Member Join Date: Jul 2002 Location: Vacation Land	Re:Carver PM 1.5 Schema Hi Duo I'm not sure if this will help but I have a Carver PM1.5 schematics. __________________ Michael Chua


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17th May 2003, 03:57 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	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.

18th May 2003, 02:25 AM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	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.

19th May 2003, 10:15 AM	#8
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	Hello MCP, Can you email me this schematic or put on here??? __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

19th May 2003, 10:44 AM	#9
carlmart diyAudio Member Join Date: Mar 2001 Location: Brazil	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

19th May 2003, 12:16 PM	#10
mcp diyAudio Member Join Date: Jul 2002 Location: Vacation Land	Hi ACD, No problems. Just send me a mail. Regards __________________ Michael Chua

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