Need help identifying component from power amp circuit board - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 3rd March 2013, 04:54 PM   #1
diyAudio Member
 
Join Date: Mar 2013
Default Need help identifying component from power amp circuit board

Any idea what this component is (says R1 on circuit board)???

the long story...
I bought a damaged PV900 power amp from ebay to try and repair it. Looks like considerable shorting on the toroidal transformer (plastic tape melted and some wire sheathing) along with a short on the cb from the toroidal lead that was shorting. I removed outer plastic tape wrap, followed electric leads down to where winding begins and re-taped where sheathing had melted against the toroidal copper windings. I then repaired the fried spot on the cb by bridging the small burnout with wire. Everything seemed to be working and then this thing burned up. and what some possibilities for why it's overheating?

Long time lurker first time poster, thanks for all the help
Attached Images
File Type: jpg DSC01140.jpg (285.2 KB, 154 views)
File Type: jpg DSC01137.jpg (237.2 KB, 148 views)
  Reply With Quote
Old 3rd March 2013, 05:32 PM   #2
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
The general shape is that of either a disc ceramic capacitor or an inrush limiter. My guess is the latter. If the transformer has a shorted turn then frying the inrush limiter would be a natural consequence of this.
  Reply With Quote
Old 3rd March 2013, 05:38 PM   #3
diyAudio Member
 
Join Date: Jan 2012
Location: Canada
Looks like a thermistor. Could be a SL32 2R025 (or 10015), but because the photo was most likely taken with a potato (I kid!) I could be very wrong.

Best to check the numbers that on there and compare.

SL32 2R025 - AMETHERM - NTC THERMISTOR | Newark

and if you are in the UK, Farnell...

SL32 10015 - AMETHERM - THERMISTOR, SERIES SL32 | Farnell United Kingdom

Important to make sure you have the right number so you can limit the initial voltage until it gradually heats up and drops to lower resistance (some to 2 ohms or so) allowing for everything to go in.
  Reply With Quote
Old 3rd March 2013, 07:58 PM   #4
diyAudio Member
 
Join Date: Mar 2013
Default really blurry printing on thermistor

yeah it looks like the camera was out of focus but it's actually the crappy printing on the part. I think you're right about it being a thermistor. I'm trying to figure out if it was damaged before my attempt to repair the transformer. WHen I plugged everything in, the original short seemed ok but then this thermistor got very hot and cracked. I can't find any method described on-line to test the actual toroidal transformer.
  Reply With Quote
Old 3rd March 2013, 08:05 PM   #5
diyAudio Member
 
Join Date: Mar 2013
it is a UK part as i think it says 10015 and the transformer is noratel (UK?) my question is, are these the same part? I'm in the US
  Reply With Quote
Old 3rd March 2013, 08:12 PM   #6
diyAudio Member
 
Join Date: Mar 2013
sorry for previous post I see in the description of each that they are rather different. 10ohm or 2ohm. The amp goes to 2 ohm but I imagine that has nothing to do with this component.

Thanks so much for pointing me in the right direction. Only wish I knew what to do now...
  Reply With Quote
Old 3rd March 2013, 08:20 PM   #7
diyAudio Member
 
Join Date: Mar 2013
maybe I should do my research before I start typing. I see at the US site Ametherm they have the exact same part and number. Will continue to look for ways to diagnose my transformer. I'd buy a new one, but I bet it'll cost a bloody fortune
  Reply With Quote
Old 3rd March 2013, 08:33 PM   #8
diyAudio Member
 
Join Date: Oct 2012
bhuckabee
before replacing this component and powering up check the output transistors for shorts if insulation on transformer leads where melting you gotta wonder where the short/current draw is coming from?
  Reply With Quote
Old 4th March 2013, 03:20 PM   #9
diyAudio Member
 
Join Date: Mar 2013
Any notion how to go about testing a toroidal transformer to see if it's shorting or something on the board?

I'm wondering if someone had hooked it up to too many speakers reducing the load to under 2 ohm thus overloading the amp. Thing is, I'm a novice and am not sure if the transformer would fry or another component when this type of load scenario occurs.
  Reply With Quote
Old 4th March 2013, 05:17 PM   #10
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
You could use a lamp limiter, with all transformer secondaries disconnected and carefully insulated off. If the lamp lights you probably have a shorted turn.
  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
Help identifying a transformer for a fw1082 power board jamison Digital Source 2 3rd March 2013 06:40 PM
Looking for help identifying burned up part on Crate PA4 circuit board davelang68 Solid State 10 30th October 2012 11:47 AM
Help Identifying Component CollateralDamage Solid State 8 4th February 2012 11:39 PM
Audio amp. to IXFH26N50, please, suggest me an application/circuit to this component destroyer X Solid State 4 16th December 2009 02:03 PM
Help Identifying Component: Pic Added Ultima Thule Power Supplies 4 15th December 2006 05:51 PM


New To Site? Need Help?

All times are GMT. The time now is 01:59 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