Marshall AVT100 Burned Resistor - Page 2 - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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 23rd July 2011, 06:47 PM   #11
yustech is offline yustech  Malaysia
diyAudio Member
 
Join Date: Jun 2008
Location: Kota Damansara
Send a message via Yahoo to yustech
Thank you gilgy for sharing your experience,

Well a few days ago our local authorized Marshall Dist.in Malaysia emailed me the info and I am thankful,but they could not email me the schematic.

sometimes I think manufacturers think that they are the only ones who are so smart and every one else are stupid in electronics,

I have communicated with ENGL,RocktronUSA,and H&K they replied with full technical assistance,visit website like fender,carvin,vox etc.With downloadable schematics,They are not afraid to disclose those tech sheet(amps technology are not rocket science). Even they could see the possible added support,marketing promo and good words from us guitar tech worldwide.

I have been servicing amps(most times without support of a schematics) for 15+ years but when the need for help is required Marshall,Roland etc is not there,

So ungrateful of them,They forget unlike them(profit minded) we the tech are doing it because we love doing it,its favor to friends,to the community and for an extra income for daily survival.

I have come to a conclusion that these company are just here to acquire profit in sales and services to the highest level.

By the way Marshall,Roland
Where were you in the the 90's when my client needed you!If it wasn't for me a lot of your amp would just be paper weight here.

From now on I will support and give good promo to other companies that are not afraid and want to be ahead in market penetration.Those kind companies will even get free sales push from me.

Marshall,Roland and others,You have chosen to neglect us,keep it up and you'll be left behind.haha
  Reply With Quote
Old 27th October 2011, 12:16 PM   #12
diyAudio Member
 
Join Date: Feb 2011
Location: England
Quote:
Originally Posted by yustech View Post
Thank you gilgy for sharing your experience,

Well a few days ago our local authorized Marshall Dist.in Malaysia emailed me the info and I am thankful,but they could not email me the schematic.

sometimes I think manufacturers think that they are the only ones who are so smart and every one else are stupid in electronics,

I have communicated with ENGL,RocktronUSA,and H&K they replied with full technical assistance,visit website like fender,carvin,vox etc.With downloadable schematics,They are not afraid to disclose those tech sheet(amps technology are not rocket science). Even they could see the possible added support,marketing promo and good words from us guitar tech worldwide.

I have been servicing amps(most times without support of a schematics) for 15+ years but when the need for help is required Marshall,Roland etc is not there,

So ungrateful of them,They forget unlike them(profit minded) we the tech are doing it because we love doing it,its favor to friends,to the community and for an extra income for daily survival.

I have come to a conclusion that these company are just here to acquire profit in sales and services to the highest level.

By the way Marshall,Roland
Where were you in the the 90's when my client needed you!If it wasn't for me a lot of your amp would just be paper weight here.

From now on I will support and give good promo to other companies that are not afraid and want to be ahead in market penetration.Those kind companies will even get free sales push from me.

Marshall,Roland and others,You have chosen to neglect us,keep it up and you'll be left behind.haha
The manufacturer doesn't know what your technical capability is and that is why the don't send schematics out they can then ensure their products are repaired to a good standard by there authorised repair departments. If you are confident in your ability apply to be an authorised service engineer that way you will get all the help you need.

And as you have already been told R23 is a 33R, R20 is an 18k, and R28 is an 8k2

Last edited by eggontoast; 27th October 2011 at 12:21 PM. Reason: additional info
  Reply With Quote
Old 27th October 2011, 12:25 PM   #13
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Quote:
Originally Posted by eggontoast View Post
The manufacturer doesn't know what your technical capability is and that is why the don't send schematics out they can then ensure their products are repaired to a good standard by there authorised repair departments. If you are confident in your ability apply to be an authorised service engineer that way you will get all the help you need.
That's rather a hopeful statement

Lack of service information is more to do with restricting access to the data that any alledged 'quality of repair issues'.

As for 'applying to be authorised', that's EXTREMELY unlikely, assuming Marshall even do such a scheme?. Most manufacturers tend to have a small number of authorised agents (many of which are absolutely useless!) and it's all but impossible to get on their authorised list - with many manufacturers actually dropping existing ones.
__________________
Nigel Goodwin
  Reply With Quote
Old 27th October 2011, 12:38 PM   #14
yustech is offline yustech  Malaysia
diyAudio Member
 
Join Date: Jun 2008
Location: Kota Damansara
Send a message via Yahoo to yustech
Quote:
Originally Posted by eggontoast View Post
The manufacturer doesn't know what your technical capability is and that is why the don't send schematics out they can then ensure their products are repaired to a good standard by there authorised repair departments. If you are confident in your ability apply to be an authorised service engineer that way you will get all the help you need.

And as you have already been told R23 is a 33R, R20 is an 18k, and R28 is an 8k2
Thank you,My apology if I offended someone that works for Marshall.I guess I am the only ones in this world that require a schematics for repairs every now and then.Haha

Honestly I guess I am not at that level of experience yet.Well there's always forum for help.
__________________
yustech.blogspot.com

Last edited by yustech; 27th October 2011 at 12:49 PM.
  Reply With Quote
Old 28th October 2011, 04:44 AM   #15
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
We all need schematics now and then. It is not fair to a company to call them names and accuse them of thinking you are stupid just because you don;t agree with their documentation policies.

My shop is authorized for most major brands, and the factories supply me with the support I need. WHen I became a Marshall - or Peavey or Fender or whatever - repair center, they are not just taking my name and sending me schematics. Their name is on the product, so they have an interest in having it serviced properly. Their name is on MY work, by extension. If a local shop doesn't fix an amp right, the customer is going to think that his darned Marshall amp is bad, not that his amp is good but the shop is bad. The customer will think of his product as unreliable, not thinking that a different repair shop might have done it better. A company like Marshall then has determined that my shop will be qualified to do the work. I had a recommendation from a dealer that I be awarded the service center status to support their product sales. Marshall would want to see photos of my store and work ares to see what customers would see - they are not interested in sending a customer to some kid's basement workshop. And most companies want to see that you have been in business for some minimal period, for Fender it was at least a year as I recall. They want to know that your repair shop is a viable business, not someone they set up this week, and a month later has gone under. Fender has a tech exam you have to pass. They also don;t want to have too many service centers in one area. If there is already a MArshall repair center in an area, they don;t need to set up another to compete.
  Reply With Quote
Old 5th July 2012, 03:53 PM   #16
diyAudio Member
 
Join Date: Oct 2007
I have the same situation as above: R23 is burnt, I replaced it, and still hums like hell at the output, like a shorted output transistor. It seems they're ok, but I'm not pretty sure, I measured them and there was no problem. I'm thinking on trying a TIP142-147 pair with some mods (like the 0.22 resistor SAP16's have inside) and see what happens. I'm not able to find those SAP16's, only STD03's and they are a bit different, and quite expensive
  Reply With Quote
Old 5th July 2012, 05:42 PM   #17
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
If any resistor burns, there is something else wrong. Resistors don;t burn on their own. If R23 burnt, then at the very least TR9 is bad.
  Reply With Quote
Old 7th July 2012, 04:23 PM   #18
diyAudio Member
 
Join Date: Oct 2007
TR9 is ok, but TR8 is shorted! I reapeat! TR8 is shorted! It's burnt!!!!!!!!!
  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
MTX JH1200 burned resistor R140-R141 & R142 joselorenzo Car Audio 0 27th December 2009 07:18 AM
HELP Aleph 5 is burned? zigo3 Pass Labs 5 20th February 2008 12:00 PM
Marshall AVT100 schematics fusionman Instruments and Amps 6 13th October 2006 03:18 PM
I burned my Aleph 3! Please help! Jesse Pass Labs 25 26th October 2003 01:56 PM


New To Site? Need Help?

All times are GMT. The time now is 01:23 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