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Old 19th July 2003, 05:10 PM   #1
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Unhappy Carver PM-100 Schematics

Help!

I'm working on a friend's Carver PM-100 Plate Amp, and can not find any (free) shcematics on the web. The problem is that there is +12V of offset on the outouts, and I've replaced all the output transistors, but no change. Tried disconnecting both secondaries (+/- high Vac & +/- low Vac), but transformer sti8ll hums LOUD, like it's shorted. +/- measured DC Voltages are +54V and -6V. History is that this amp ran a set of outdoor spkrs, and the spkrs shorted, drastically raising the load on the amp.

Outputs WERE Toshiba 2SA1302 & 2SC3281 pair. Since I had a few rails of Motorola & On Semi MJL1302A & MJL3281As laying around, I upgraded to these instead. (I kept the older Motorola-labeled units for myself & gave him the newer On semi units! )

Any help here would be appreciated. Thanks!!

'73,

N8XO
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Old 19th July 2003, 07:38 PM   #2
moamps is offline moamps  Croatia
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Hi,

Check driver transistors, high power resistors, PCB, bridges. Repair one channel first. In second channel temporally disconnect (desolder ) drivers and output transistors. (or remove fuses). Check quiescent current true output transistors. If rails are unsymmetrical, then your PS is overloaded.(hum).

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Old 20th July 2003, 12:09 AM   #3
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Default PM-100

Thanks for the help. I don't know if I forgot to mention that I don't have a schematic. Kinda makes things a little tougher. Muchas Gracias!

73 N8XO
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Old 20th July 2003, 12:11 AM   #4
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also forgot- both channels on same pc board and share same power supplu traces. For an early Carver product (that's before he sold the company and later bought it back), this is not a very robust design.
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Old 20th July 2003, 07:47 PM   #5
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Default Pleas send me schematic for Carver PM-100

Pleas send me schematic for Carver PM-100 if you find...
I need too, and if i find i will send to you!!!
stormcom@ptt.yu
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Old 21st July 2003, 04:50 PM   #6
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I don t know the schem of your amp but I will take a look to the differential amp stage...or perhaps you ve got a ground problem how are the solder?

Dom.
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