Marantz PM44SE - Dead(ish) right channel

nig123 · 4th March 2007, 03:57 PM

I have a Marantz PM44SE but the right channel now plays much quiter than the left. I've tried swapping speakers, phono connections, balance, source direct, etc but no joy.

Does anyone know what the problem might be and if so how to rectify it?

Thanks for all help.
Neil

XEAGLEKEEPER · 4th March 2007, 05:25 PM

Sounds like a bad output transistor or more. Check the emitter current limiting resistors also.

jaycee · 4th March 2007, 10:07 PM

How good are you at working with circuitry, the question is phrased as if you're an end user whose just looking for an easy fix (sorry if thats not the case). If so, get it serviced professionally as chances are you'll do more harm than good if you're unfamiliar with amplifier circuitry.

Does the amplifier have a loop for pre-out/power in ? If so, try connecting a CD player or so directly to the power in jacks. This will help identify whether it is the preamp or poweramp stage that is faulty.

nig123 · 6th March 2007, 12:35 AM

Thanks for both replies

jaycee - you're correct - I am an end user looking for an easy (ish) fix - but I do have some experience with electronics - that'll be a degree that's been almost completely erased from memory by 15 years of paperwork and beer!

So - I'd like to give it a go fixing the amp myself - I suspect professional repair would prove uneconomical as it was not expensive in the first place - but if that's the recommended course...

There's no pre-out/power in so can't test that.

Out of interest - would trying headphones help identify the problem? I've not done it yet as I've lost my converter.

Is a fix possible without circuit diagrams?

thanks again

Neil

Leolabs · 6th March 2007, 12:45 AM

Just able to find PM94 service manual,can't help much.

XEAGLEKEEPER · 6th March 2007, 12:48 AM

Try the headphones that should let you know if the preamplifier is working or not.

jaycee · 6th March 2007, 09:44 PM

except - most integrated amps run the headphone socket from the power amp, through an attenuator so that really wont tell you much.

before doing anything, you really need a schematic.

jose3011 · 6th June 2007, 06:29 AM

Hello, I write from Spain. I have a PM44SE and the entrance transformer has been burned me, podrian to give the tensions me that it gives in the exit of the secondary one.

Best Regards. Sorry, but i don´t speak english

4th March 2007, 03:57 PM	#1
nig123 diyAudio Member Join Date: Mar 2007	Marantz PM44SE - Dead(ish) right channel I have a Marantz PM44SE but the right channel now plays much quiter than the left. I've tried swapping speakers, phono connections, balance, source direct, etc but no joy. Does anyone know what the problem might be and if so how to rectify it? Thanks for all help. Neil

4th March 2007, 05:25 PM	#2
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	Sounds like a bad output transistor or more. Check the emitter current limiting resistors also. __________________ Ret. USAF... AKA- Avionic * Solder slinger for hire...*

6th March 2007, 12:48 AM	#6
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	Try the headphones that should let you know if the preamplifier is working or not. __________________ Ret. USAF... AKA- Avionic * Solder slinger for hire...*

6th June 2007, 06:29 AM	#8
jose3011 diyAudio Member Join Date: Jun 2007	MARANTZ PM44SE Hello, I write from Spain. I have a PM44SE and the entrance transformer has been burned me, podrian to give the tensions me that it gives in the exit of the secondary one. Best Regards. Sorry, but i don´t speak english

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4th March 2007, 10:07 PM	#3
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	How good are you at working with circuitry, the question is phrased as if you're an end user whose just looking for an easy fix (sorry if thats not the case). If so, get it serviced professionally as chances are you'll do more harm than good if you're unfamiliar with amplifier circuitry. Does the amplifier have a loop for pre-out/power in ? If so, try connecting a CD player or so directly to the power in jacks. This will help identify whether it is the preamp or poweramp stage that is faulty.

6th March 2007, 12:35 AM	#4
nig123 diyAudio Member Join Date: Mar 2007	Thanks for both replies jaycee - you're correct - I am an end user looking for an easy (ish) fix - but I do have some experience with electronics - that'll be a degree that's been almost completely erased from memory by 15 years of paperwork and beer! So - I'd like to give it a go fixing the amp myself - I suspect professional repair would prove uneconomical as it was not expensive in the first place - but if that's the recommended course... There's no pre-out/power in so can't test that. Out of interest - would trying headphones help identify the problem? I've not done it yet as I've lost my converter. Is a fix possible without circuit diagrams? thanks again Neil

6th March 2007, 12:45 AM	#5
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Just able to find PM94 service manual,can't help much.

6th March 2007, 09:44 PM	#7
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	except - most integrated amps run the headphone socket from the power amp, through an attenuator so that really wont tell you much. before doing anything, you really need a schematic.

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