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Old 8th July 2006, 04:36 PM   #11
anatech is offline anatech  Canada
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Hi mura,
At D30 I would expect to see -31VDC, D31 should read -67 VDC in normal operation. Measure these at the cathodes.

An interesting clue emerges now that I think about it. Have you lost the ground from the input jacks to the common on the amp boards? That would be pin 10 on the connector, where R6, R7 and C4, Q1, R5 and R11 connect on the amp board. Measure with your ohmmeter to the pad on the supply PCB. There were some problems with cracked solder joints with the PCB connections to the power supply board in the past on some amps. Use some solder flux when you resolder them, also clean the pads up before you reassemble and check for disconnected pads. Check the pins on the amp boards as well.

-Chris
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Old 12th July 2006, 04:54 PM   #12
mura is offline mura  India
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Hi Chris,



I have got both channels working today after changing ALL the caps on the amp boards and now it is working Ok.

Thanks for your input.

I will post after i do full testing.
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Old 12th July 2006, 05:10 PM   #13
anatech is offline anatech  Canada
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Hi mura,
Great to hear! Good going.

Bad caps are possible, but I think it was resoldering the amp board connections to the power supply PCB that fixed this. That has been one of the answers to this problem in the past.

I am sure the caps could use changing at this point in time anyway.

-Chris.
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Old 1st November 2007, 03:34 PM   #14
Iagent is offline Iagent  United States
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I have one of those Carver TFM 45s and it's popping in the speakers and blowing fuses. Do you have any idea where I can take it in the Chicago area?
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Old 1st November 2007, 05:22 PM   #15
anatech is offline anatech  Canada
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Hi Iagent,
Sorry, I didn't have that much contact in the 'States. Look for a service guy who does audio only. He will probably be in his 40's or 50's and he will have a good reputation for neat work. He will have worked on mostly better products. His per hour rates might be higher than average, but the job will be the least expensive through him. So there is his profile.

Great TV techs do not service audio well, but they will be convinced that they do. Car amp guys and pro amp guys will probably not do a proper service job, although there are the odd ones who are good. Then we ask "why are they were they are"?

I'd have to see that one on my bench to troubleshoot it. There could be a number of things causing that. From filter capacitors, to noisy trimmer controls or solder joints. Most likely a combination of those things.

-Chris
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Old 3rd November 2007, 11:45 AM   #16
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Had my carver to the tv microwave audio guy three times now and still no fix . Fine a good audio repair guy it look at it and get it fixed right the first time.
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Old 3rd November 2007, 09:42 PM   #17
anatech is offline anatech  Canada
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Hi adventfan,
I'm really sorry to hear that. What is the condition of it right now?

-Chris
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Old 29th May 2009, 02:28 PM   #18
homiyar is offline homiyar  India
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Default Service Manual For TFM45 Power Amplifier

Dear Mr Mura,

I also have a Carver TFM 45 Power Amplifier But when it was converted from 110v to 230v by my technician he forgot how to reconnect the transformer wires. Therefore I would be highly oblidge if you can send me the copy of the service manual by mail or just send me the page where they have showed the transformer connections. I hope you will help me.

thanking you,

Homiyar Merchant
Gandhi Mansion, FlatNo 1
16 Wadia Street,
Tardeo, Mumbai 400 001.
09821214981
mhomiyar@yahoo.co.in
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