Denon PMA 1060. Somethings really wrong - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th March 2008, 11:18 AM   #1
diyAudio Member
 
Join Date: Oct 2007
Default Denon PMA 1060. Somethings really wrong

Hi! I just bought a Denon PMA 1060 in great condition.
Except one thing, its doesnt work.

When i bought it he said that he and his girl hade been
on vacation and it had been som thunder during the weekend.

So he went to the repairshop and they taught is was
a fuse that blown during a discharge.

I Found a fuse (placed near the on-off switch) that was
blown. So i replaced it.

Turned the Amp ON and BANG! Something broke.
(but the fuse is OK, maybe because i used another
type used more in cars, dont know, stupid me!)

A piece on one of the outputs had been blown away :S
(the one with the yellow wire on the downside of the
circuit board. (isnt it strange with a wire?? maybe it has
been repaired before, dont know)

One of the Caps also blown. (the brown one between the two
biasing pots) It came some stuff out of the cap, hard to see
on the picture.

And before i got the power cord out it starded glowing somewhere didnt have time to see exactly what part.

But i found that a GREEN transistor is in very bad shape.
Nearly shattered in two. Hard to see but its the same picture
as the broken CAP.

The other channel seemes to be OK. I cant see any other damages, sure there is taught. The amp goes in protection i think, red light.


Now to the questions, can this be the result of a discharge
during thunder??

What should i check for? Is it some basic checklist to do?
Check all the outputs, and drivers.. I know.

But do i have to desolder ALL the transistors on the board
and check them, a very time consuming thing to do.

I dont think proffiesionals have the time to do that, but some people claim that its the only way to be sure.

Anmyone have schematic for the Amp?

Im greatfull for all the help i can get =)
Attached Images
File Type: jpg imgp2432.jpg (63.5 KB, 652 views)
  Reply With Quote
Old 19th March 2008, 11:22 AM   #2
diyAudio Member
 
Join Date: Oct 2007
pic
Attached Images
File Type: jpg imgp2428.jpg (64.6 KB, 635 views)
  Reply With Quote
Old 19th March 2008, 11:29 AM   #3
diyAudio Member
 
Join Date: Oct 2007
pic
Attached Images
File Type: jpg imgp2430.jpg (55.9 KB, 590 views)
  Reply With Quote
Old 19th March 2008, 05:06 PM   #4
diyAudio Member
 
Join Date: Oct 2007
ive been doing some measuring. Conlusion.
For the left channel all the outputs read
0.5 volts 58 volts 0 volts.


But for the other channel many of the pins
have 58 volts, how come?
  Reply With Quote
Old 19th March 2008, 06:18 PM   #5
diyAudio Member
 
aparatusonitus's Avatar
 
Join Date: Jan 2004
Location: Split, Croatia
Default Re: Denon PMA 1060. Somethings really wrong

Quote:
Originally posted by silversweden
Anyone have schematic for the Amp?
Hi silversweden,

Mail me, I have a service manual (3,8Mb) for you
__________________
Non mai abbastanza...
  Reply With Quote
Old 19th March 2008, 07:01 PM   #6
diyAudio Member
 
aparatusonitus's Avatar
 
Join Date: Jan 2004
Location: Split, Croatia
Hi silversweden,

Service manual sent...it should be on your screen any second now
__________________
Non mai abbastanza...
  Reply With Quote
Old 20th March 2008, 12:09 AM   #7
TheMG is offline TheMG  Canada
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally posted by silversweden
ive been doing some measuring. Conlusion.
For the left channel all the outputs read
0.5 volts 58 volts 0 volts.


But for the other channel many of the pins
have 58 volts, how come?

That indicates something is wrong with the output stage of that channel, bad transistors that have become shorted is the most likely scenario.

That fuse you put in, was the same value as the original, was it? Putting in a higher rated fuse is a complete no-no, something you NEVER want to do.

Other than just the output transistors, some other parts will need checking such as the driver stage, which may or may not have been damaged also.

Start by checking the output transistors one by one (you will probably have to remove them to do this) and replace as necessary. Then move on to checking other things, BEFORE powering up.
  Reply With Quote
Old 20th March 2008, 03:39 PM   #8
diyAudio Member
 
Join Date: Oct 2007
Default im stuck :S

After a couple of hours measuring i got this far.

www.itxpress.se/2434.jpg
komponents marked with yellow was broken.
and marked with green are tested OK.

A strange thing is still after replacing what i found broken.
On the Output pins (i just removed them for now until i
sorted out the problem, have new ones waiting)

Something is really crazy here. Full schematic here.
www.itxpress.se/1060.pdf

TR523
p1 55 (for other channel 0.5V)
p2 58
p3 55

TR527
p1 55 (for other channel 0.5V)
p2 58
p3 55

TR529
p1 55 (for other channel 0.5V)
p2 -58
p3 0.0 (THE 0.22 5W RESISTOR OPEN)

TR525
p1 55 (for other channel 0.5V)
p2 -58
p3 55
  Reply With Quote
Old 21st March 2008, 08:40 AM   #9
diyAudio Member
 
Join Date: Oct 2007
Anyone please take a look and tell me what you think ?
  Reply With Quote
Old 21st March 2008, 10:56 AM   #10
diyAudio Member
 
Join Date: Oct 2007
okay, now im getting frustrated!! :S :P

i found a trace on the board that had been burnt of.
i repaired it with a small isolated wire from the two
solderingpoints instead.

And now i have the same readings on the fets that i
have on the other channel!!

About
0.6 58 0 volts. and so on.

I measured several times. Then i solderd the new Outputs
back in place (4 of them).

I replaced the 4A fuse with a 1.6A fuse just in case.


I plugged the amp in, and it went in protection as
usual. Red light, but some relay clicked. Not the speaker
relays. a smaller one on the same board.


I observed the amp for a few seconds, felt like a long time
but maybe 15 seconds. Then i heard some nasty noise :S

Disconnected the amp within a second.


TR519 blowed!!!! And R549 is just a piece of burnt material.
Dont have the strain to investigate if there is anything
else at this moment.

Anyone have an ideo of what the hell is happening??
And why isnt the fuse blowing before anything else :S
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wrong Voltage / current on BoZ... or Wrong Measuring ? gionag Pass Labs 8 14th May 2008 11:24 AM
Marantz 1060 parts KCravens Solid State 1 29th February 2008 10:12 PM
Marantz 1060 fuse jesserparker Solid State 4 24th January 2008 04:12 AM
Picked up a Marantz 1060. negah Solid State 10 10th December 2007 08:07 PM
First diy project... Balanced operation? and somethings more. rebojorge Pass Labs 4 11th December 2002 02:52 AM


New To Site? Need Help?

All times are GMT. The time now is 07:59 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2