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Old 24th March 2006, 09:17 AM   #11
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Here is a pic of Schottky bridge, Black Gate caps and silver mica etc
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Old 24th July 2006, 12:03 AM   #12
markusb is offline markusb  United Kingdom
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Unhappy pm 66 ki

Hi

I am very new to this forum and am impressed by the amount of knowledge contained herein. I have a pm 66 KI amp. The power turns on the remote operates mute & volume, the inside looks sweet but there is no output to either the speakers or through the headphone socket. Has anyone got any ideas.........



Cheers!!
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Old 24th July 2006, 12:07 AM   #13
anatech is offline anatech  Canada
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Hi markusb,
Welcome to the DiyAudio!

Do you know anything about electronic servicing? Do you have any test equipment?

So, is there a click 3~5 sec after you turn it on?

-Chris
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Old 24th July 2006, 09:28 AM   #14
markusb is offline markusb  United Kingdom
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Hi,

Thanks for the quick reply. I have some experience with basic repairs on computers etc but consider quality hi-fi as something to respect first. I have a decent meter & soldering iron.

I am in no way in the same league as other posters on this thread but am a good learner.

There is no audible click after a few seconds.

Mark
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Old 24th July 2006, 09:40 AM   #15
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Quote:
Originally posted by markusb
Hi,

Thanks for the quick reply. I have some experience with basic repairs on computers etc but consider quality hi-fi as something to respect first. I have a decent meter & soldering iron.

I am in no way in the same league as other posters on this thread but am a good learner.

There is no audible click after a few seconds.

Mark
Hi

Either the output as blown or a 47ohm resistor in the psu has gone open circuit.
The reference for this resistor(s) is R801 or R803. These go with age as they run warm.

Brent
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Old 24th July 2006, 12:41 PM   #16
anatech is offline anatech  Canada
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Hi Brent,
A blown output will generally cause excessive current flow and blow the fuse(s).

We do know the output protection is working, the most probable fault being a DC offset.

Mark,
What are the DC voltages at the audio outputs before the relay? Measure from the emitter resistors to ground (chassis).

-Chris
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Old 24th July 2006, 12:52 PM   #17
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I've had these where the output breaks down without going bang. And rather than blow the fuse the protection circuit kicks in.

Brent
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Old 24th July 2006, 12:58 PM   #18
anatech is offline anatech  Canada
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Hi Brent,
Then it must have opened the emitter resistor as well. Otherwise the error amp will force the other polarity on to equalize the output voltage. Of course it's now fighting a short. If the fuses don't go, the other polarity output transistors will normally short, followed by the thermal fuse in the transformer.

-Chris
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Old 25th July 2006, 09:35 PM   #19
markusb is offline markusb  United Kingdom
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Hi Every one,

Have been busy on the resistor - found the 47 ohm resistor - has gone open as suggested. Bought new 47 ohm resistor and replaced. Thurned amp on and voila....... many many thanks I cant tell you how greatful I am. I love this amp.

I will keep track of your mods, thought to be honest they are beyond my current abilities.


All the very best!!

Mark

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Old 25th July 2006, 11:40 PM   #20
Reuske is offline Reuske  Netherlands
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Question PM66SE

Hey Guys,

Me is new here too, been surfing for a while now and the only thing constructive on Marantz PM66 is here.

So I got a Marantz PM66SE, which has a big offset in the right channel and a lot of cracking when turning up the volume. Is someone familiar with this problem and the fixing part?

The other channel sounds better but I have to turn up the volume a lot to get some action.

Stupid me lent it to a nephew (young) which had a big party..... So overheating should probably be the cause.

All help would be great!!!!

Thx & Cheers,
Reinoud
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