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Old 1st January 2006, 08:13 PM   #1
hotscot is offline hotscot  Scotland
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Default Marantz PM66KI amp.

Hi everyone

I have the amp. It's missing two large capacitors from the circuit board. Was going to throw it out but wonder if I could repair it.

I do have the schematic and will gladly provide it to anyone who be willing to help me with a little one on one advice on how to source and solder these capacitors.

Regards
Alan
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Old 1st January 2006, 08:20 PM   #2
Netlist is offline Netlist  Belgium
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You can drop me a mail.

/Hugo
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Old 2nd January 2006, 03:59 PM   #3
toman_9 is offline toman_9  Germany
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I also have an PM66 SE and it is broken, after turn-on the fuse is blowing itself up after 5 seconds.

I have the schematics for PM 6010, and looks like it is identical to pm 66. I can send you if you want.

Can anyone help to analyze what faulty on my amp is ?

Thanks.
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Old 2nd January 2006, 10:42 PM   #4
anatech is offline anatech  Canada
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Hi toman_9,
Need a schematic to help. Hugo may know something also.

What test equipment do you have? How much experience or courses do you have?

-Chris
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Old 3rd January 2006, 07:43 PM   #5
toman_9 is offline toman_9  Germany
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Hi,

Thanks!
I am OK with circuits, at least (sort of) understand what is what on the board.
I have suspected the power transistors, so I have ordered a new pair.
I will change those first once they arrive...

Thanks!
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Old 3rd January 2006, 07:48 PM   #6
anatech is offline anatech  Canada
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Hi toman_9,
Don't just install the outputs and turn the amp on. There are many things that fail at the same time. All you may do is sacrifice a pair of outputs to the fire god ! What a waste.

Anyone have a diagram for this?

-Chris
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Old 3rd January 2006, 07:53 PM   #7
Netlist is offline Netlist  Belgium
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Alan mailed me the manual and if permitted I will forward it to those interested.

/Hugo
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Old 3rd January 2006, 07:57 PM   #8
anatech is offline anatech  Canada
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Hi Hugo,
Well, at least you can advise him. That may be all he needs.

Of course, it would be nice to have the info if Alan is okay with that.

-Chris
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Old 3rd January 2006, 08:10 PM   #9
Netlist is offline Netlist  Belgium
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From the pictures I have from Alan's amp I told him it's beyond repair.
The PCB in the voltage reg. area is too burned in and therefore must have become conductive. It looks like Marantz didn't pay much attention at cooling important transistors.
If toman_9's board is in the same condition I'm afraid I'll have to generate a similar answer.
Is it possible to forward a picture?

/Hugo
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Old 3rd January 2006, 08:20 PM   #10
anatech is offline anatech  Canada
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Now that is sad. Is it dark brown or actually burned?

Can I see? Can I, can I, can I ? Please?

Quote:
Marantz didn't pay much attention at cooling important transistors.
As you know Hugo, many new engineers don't. Some of the later Revox where really bad in that department. I won't mention Pioneer - oops! Too late!

-Chris
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