Help Needed - Marantz 1060 dead channel - diyAudio
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Old 11th November 2009, 04:02 AM   #1
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Default Help Needed - Marantz 1060 dead channel

I just purchased an old Marantz 1060 off ebay. Was supposed to be in good shape....working fine when last used, etc. Well.....after blowing out the cobwebs and cleaning the controls and switches....I fired it up w/ a set of test speakers and a CD player for an input source....and found that while the right channel seemed to work fine...the left channel is dead as a doornail. As I could do a de-couple of the pre-amp/power-amp connection....I find that the output section is dead on the left side. So...my questions are: Does anyone know just what output transistors are used in this beast? and, Does anyone have any recommendations for an up-graded replacement? and, Does anyone have any suggestions for any other component replacement that might be necessary or advisable? and finally, Can anyone supply me with an email version of a schematic? My name is Tom and my email address is Wharf_Creek@Hotmail.com Any help or additional words of wisdom would be greatly appreciated!! Many thanks, TSD
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Old 11th November 2009, 09:15 PM   #2
orbanp is offline orbanp  Canada
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Hi Tom,

Here is a service manual for your amplifier. There is a wealth of information in it!
http://www.acec13.fr/tvc/Marantz/res...MARANTZ_EN.pdf

Good luck, Peter
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Old 12th November 2009, 12:00 AM   #3
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Hello Peter,

I so much appreciate the manual. It's printing as I write.

Question: The MJ15001 transistor.....Mouser shows it as being sub'ed with the MJ15001G. I'm a complete idiot with semi-conductors....but if this were a tube, I'd want to make sure it would be the best choice to be a sub for the OE 2SC897. Can you please advise? Also, I note that the left channel has been repaired previously and is now out again. A bad sign!! I'm now suspect of the driver board or any other components. Again, any comments? Thanks Peter....I truly appreciate the help. PS: Manual still printing!!.....lol. Regards, Tom
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Old 12th November 2009, 12:50 AM   #4
llwhtt is offline llwhtt  United States
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The "G" means green as in RoHS compliant, lead free. Don't know if it's a good sub though, if it is not I'm sure ON will have something suitable.

Craig
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Old 12th November 2009, 01:18 AM   #5
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Hey Craig,

Thanks for the 'Green' info. Can you tell me what the 'ON' means?

TSD
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Old 12th November 2009, 01:35 AM   #6
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Big "OOOPPS" here......the actual sub number was a MJ15003....not 001. Sorry!

TSD
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Old 12th November 2009, 02:32 AM   #7
llwhtt is offline llwhtt  United States
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ON Semiconductors is the manufacturer of the transistors in question. Used to be Motorola.

Craig
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Old 12th November 2009, 02:50 AM   #8
eyoung is offline eyoung  United States
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Hola Y'all...

The manual Saved as a pdf File, I did not open but i viewed the first page ...

You will need several things . Disconect the speakers and check with zero input(NO preamp or other source) for DC @ speaker out terminals...

Report back as we want a blow by blow. Then on to the next step(s)...

Regards, Elwood
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"Lead me not into temptation...I can find it myself."
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Old 12th November 2009, 07:22 PM   #9
orbanp is offline orbanp  Canada
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Hi Tom,

Here is a good intro to amplifier repair:
Troubleshooting & Repair Guide

Go one level higher for all sorts of articles on audio:
Elliott Sound Products - DIY Audio Articles

The ESP pages are an excellent resource!

Good luck, Peter
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Old 13th November 2009, 01:25 AM   #10
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I have to laugh......I almost started this reply with "Gents......" but I stopped myself as I realized I was NOT being politically correct....or possibly even literally correct. I found myself in a very involved exchange on Tube Amplifiers once with a very technically competent EE woman in the Boston Mass area who helped me through a difficult issue I was having in working with some 8417 output tubes. The woman sent me some pictures of some wonderful old Bogan amps that she had restored and modified! Very impressive! Anyway...it taught me a lesson......

So....with that....I'll simply express my appreciation to all for their help, words of advice, and the sharing of resources. I hope to give this amp some attention in the next week or so....but I clearly need to source some OTs before I go any further. I've been given several recommendations for alternates...but the one common thread is that I should buy from ONLY a recognized source such as Mouser or Digikey. SO...I'll do that! I just wish I could figure out just which recommended replacement is best. Seems the MJ15003 is good....but I've also received info that a MJ15022 or MJ21194 might be even better choices. Honestly...just how does one pick?

Anyway.....without any semi-conductors to even begin to make some trial & error repairs with....I'm just going to set the amp aside for now and place the orders. And, when the replacements arrive I'll begin some step-by-step diagnosis.......or, I'll just slap in a new set of OTs and see what happens. If they're only a few dollars each....that may be a quick and cheap way to at least know if I've got to go further 'in' to the amp, or maybe I'll get lucky and it will simply be fixed! Not that I have that kind of luck!!

Again....many thanks! I'll check out all the resources....and try to enroll in AudioKarma.

My best to all.......

Tom D.
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