Marantz Pm7200 Amp

jjbmon · 16th November 2008, 06:04 PM

The amp will not power up.All fuses checked etc.Had suggestion that a microprocessor on front control board may be u/s.Any input please?

joseph64 · 25th November 2008, 10:52 AM

Hi, I've got the same with the PM7200 amplifier of a friend and found that the relay that should power on the main transformer is not activating.
The voltage for the relay is present and is provided by the small transformer on the power board.
The ON signal for this relay is indeed coming from the front panel (I only managed to follow it to a connector and the pin is named REL) so yes, it could well be caused by the processor on this panel.
Have you found out anything more? Service Doc.?
The thing is that you have to strip quite a bit to get to the processor and without documentation the signals are very difficult to follow.
I don't believe in replacing components unless I'm sure they are faulty.
Once taken apart it is not easy to measure anything.
Please give feedback once you know anything more.
Regards, Joseph.

jjbmon · 26th November 2008, 09:21 PM

H Joseph,thanks for your post.I am getting 5v to the processor so almost sure it is dead.There are 2 different ones,you need to contact Marantz with your serial no. Mine is a toshiba TMP87C846NG.Can only source one from Marantz agent at £25+vat £5 delivery.Seems expensive ,do you have a source?Regards Ian

roba08 · 22nd February 2009, 08:46 PM

I have a Marantz pm 7200 which will not come of its standby mode, could somebody provide me the service manual for this amp ?
After the disassembly of the frontpanel its relays just won't switch anymore.

16th November 2008, 06:04 PM	#1
jjbmon diyAudio Member Join Date: Jul 2007	Marantz Pm7200 Amp The amp will not power up.All fuses checked etc.Had suggestion that a microprocessor on front control board may be u/s.Any input please?

25th November 2008, 10:52 AM	#2
joseph64 diyAudio Member Join Date: Nov 2008	Same problem Hi, I've got the same with the PM7200 amplifier of a friend and found that the relay that should power on the main transformer is not activating. The voltage for the relay is present and is provided by the small transformer on the power board. The ON signal for this relay is indeed coming from the front panel (I only managed to follow it to a connector and the pin is named REL) so yes, it could well be caused by the processor on this panel. Have you found out anything more? Service Doc.? The thing is that you have to strip quite a bit to get to the processor and without documentation the signals are very difficult to follow. I don't believe in replacing components unless I'm sure they are faulty. Once taken apart it is not easy to measure anything. Please give feedback once you know anything more. Regards, Joseph.

26th November 2008, 09:21 PM	#3
jjbmon diyAudio Member Join Date: Jul 2007	MARANTZ PM7200 H Joseph,thanks for your post.I am getting 5v to the processor so almost sure it is dead.There are 2 different ones,you need to contact Marantz with your serial no. Mine is a toshiba TMP87C846NG.Can only source one from Marantz agent at £25+vat £5 delivery.Seems expensive ,do you have a source?Regards Ian

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22nd February 2009, 08:46 PM	#4
roba08 diyAudio Member Join Date: Feb 2009	I have a Marantz pm 7200 which will not come of its standby mode, could somebody provide me the service manual for this amp ? After the disassembly of the frontpanel its relays just won't switch anymore.

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