Marantz PM66KI amp.

hotscot · 1st January 2006, 08:13 PM

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

Netlist · 1st January 2006, 08:20 PM

You can drop me a mail.

/Hugo

toman_9 · 2nd January 2006, 03:59 PM

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.

anatech · 2nd January 2006, 10:42 PM

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

toman_9 · 3rd January 2006, 07:43 PM

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!

anatech · 3rd January 2006, 07:48 PM

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

Netlist · 3rd January 2006, 07:53 PM

Alan mailed me the manual and if permitted I will forward it to those interested.

/Hugo

anatech · 3rd January 2006, 07:57 PM

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

Netlist · 3rd January 2006, 08:10 PM

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

anatech · 3rd January 2006, 08:20 PM

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

1st January 2006, 08:13 PM	#1
hotscot diyAudio Member Join Date: Aug 2004 Location: California	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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1st January 2006, 08:20 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	You can drop me a mail. /Hugo

2nd January 2006, 03:59 PM	#3
toman_9 diyAudio Member Join Date: Jan 2006 Location: ...	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.

2nd January 2006, 10:42 PM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

3rd January 2006, 07:43 PM	#5
toman_9 diyAudio Member Join Date: Jan 2006 Location: ...	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!

3rd January 2006, 07:48 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

3rd January 2006, 07:53 PM	#7
Netlist diyAudio Moderator Join Date: Jan 2003	Alan mailed me the manual and if permitted I will forward it to those interested. /Hugo

3rd January 2006, 07:57 PM	#8
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

3rd January 2006, 08:10 PM	#9
Netlist diyAudio Moderator Join Date: Jan 2003	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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