Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

HELP HELP HELP - Just blew my amp, can't afford a new one.
HELP HELP HELP - Just blew my amp, can't afford a new one.
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 9th February 2018, 06:53 PM   #21
nannoo is offline nannoo
diyAudio Member
 
Join Date: Jan 2013
Ok, on power up it seems that every other amp TP does nothing, whilst there is a very small voltage difference across TP101 - I've tried a few times, readings vary from 0.2 to 0.3v

So I'm guessing that's a clear sign the FL amp is gone?
  Reply With Quote
Old 9th February 2018, 06:54 PM   #22
nannoo is offline nannoo
diyAudio Member
 
Join Date: Jan 2013
maybe a silly question, if I remove the power amplifier board with the FL channel, use wire cutters to remove the transistors, can that do any damage to the rest of the amplifier?

I'm wondering if there is a "simplest" way to effectively turn off that channel but return the amp to coming out of protect.
  Reply With Quote
Old 9th February 2018, 06:58 PM   #23
SVI2004A is offline SVI2004A  New Zealand
diyAudio Member
 
SVI2004A's Avatar
 
Join Date: Mar 2004
Location: Feeding eels in a stream near you
HELP HELP HELP - Just blew my amp, can't afford a new one.
I would pull out LHS amp bank and check for collector Emitter shorts on output and driver transistors... and R128 130 136 and 138 - there could be an open circuit in them - more so 136/138
__________________
I remember when amps were amps & speakers were nervous!
  Reply With Quote
Old 9th February 2018, 07:00 PM   #24
SVI2004A is offline SVI2004A  New Zealand
diyAudio Member
 
SVI2004A's Avatar
 
Join Date: Mar 2004
Location: Feeding eels in a stream near you
HELP HELP HELP - Just blew my amp, can't afford a new one.
Well you could unsolder the emitters of LHF output transistors- do this while checking for shorts/open... most likely can kill 2 birds with one stone for the now
__________________
I remember when amps were amps & speakers were nervous!
  Reply With Quote
Old 9th February 2018, 07:05 PM   #25
nannoo is offline nannoo
diyAudio Member
 
Join Date: Jan 2013
Starting to feel more confident with the amplifier circuit diagram, taking a look through it looks relatively simple as circuits go, but my expertise doesn't allow me to identify likely candidates for failure, am I looking at the MP/MN 1715's? How do I test them?
  Reply With Quote
Old 9th February 2018, 07:07 PM   #26
nannoo is offline nannoo
diyAudio Member
 
Join Date: Jan 2013
OK... So I'm thinking if I remove the 1715's for now and see if it works, then maybe try a new pair in the future? is there a simple way to test them when I remove them? (i.e. continuity tests across terminals?)
  Reply With Quote
Old 9th February 2018, 07:09 PM   #27
SVI2004A is offline SVI2004A  New Zealand
diyAudio Member
 
SVI2004A's Avatar
 
Join Date: Mar 2004
Location: Feeding eels in a stream near you
HELP HELP HELP - Just blew my amp, can't afford a new one.
Yes check for short pins 2 (Collector) and 3 (Emitter)
__________________
I remember when amps were amps & speakers were nervous!
  Reply With Quote
Old 9th February 2018, 07:33 PM   #28
nannoo is offline nannoo
diyAudio Member
 
Join Date: Jan 2013
All pins shorted on output tansistors.
Removing them now, will update shortly
  Reply With Quote
Old 9th February 2018, 07:44 PM   #29
nannoo is offline nannoo
diyAudio Member
 
Join Date: Jan 2013
Removed trannies. Still doesn't allow power amps to kick in.
  Reply With Quote
Old 9th February 2018, 08:02 PM   #30
SVI2004A is offline SVI2004A  New Zealand
diyAudio Member
 
SVI2004A's Avatar
 
Join Date: Mar 2004
Location: Feeding eels in a stream near you
HELP HELP HELP - Just blew my amp, can't afford a new one.
Aren’t sure how detailed microprocessor analyses this... I would expect these devices to be a Darlington pack - based on 1.2V base voltages...

I would check C-E of tr110 and 112.. - r136/138 may have gone open circuit to protect output of those driver transistors...

You can get the original parts from Denon I’d say, but I’m bettin it wont be cheap... if it were me I would fully turn VR101 counterclockwise and fit 2SD2561 (MN1715) and 2SB1648 (MP1715) and any other parts needing replacement (resistor(s) and drive transistor(s)) then power up and set according to adjustment procedure in manual
__________________
I remember when amps were amps & speakers were nervous!
  Reply With Quote

Reply


HELP HELP HELP - Just blew my amp, can't afford a new one.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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Can I afford the O-scope/scopes I need? Destroyer OS Equipment & Tools 18 30th May 2017 11:34 AM
Until I can afford a digital unit Old Technics?? Moondog55 Solid State 7 17th November 2012 11:20 PM
Can I afford my SE amp ?? Shoog Tubes / Valves 14 6th December 2005 09:14 AM
I need infos about Threshold SA series (can't afford the XA-200 yet ;-) ) Thurax Pass Labs 3 18th July 2004 08:23 PM


New To Site? Need Help?

All times are GMT. The time now is 12:17 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki