Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old November 30th 15, 02:49 PM posted to sci.electronics.repair
external usenet poster
 
First recorded activity by DIYBanter: Apr 2008
Posts: 5,188
Default Fender vibro champ XD, PR736 of 2010 PbF

Crackle just like cathode/heater leakage in one of the valves, but
active test as perfectly good isolation .
This crackle was present on first receipt testing but now with
close-handling not the slightest trace - typical symptom of PbFitis ,
also can be similar "bacon and eggs" crackle .
Any known problem area? hopefully not with the DSP chippery.
( just dealing with a Hartke HA3500 with pbfitis , but as 2006 a bit
more excusable)

  #2   Report Post  
Old December 1st 15, 10:44 AM posted to sci.electronics.repair
external usenet poster
 
First recorded activity by DIYBanter: Apr 2008
Posts: 5,188
Default Fender vibro champ XD, PR736 of 2010 PbF

Cut the cable ties to get the pcbs out. Then noticed one of the ac HT
wires loose. It looks as though the blade may have been between
shoe of crimp and the plastic cover, needed much more than finger
pressure to slide the crimp over the terminal.
Power fading up and down i could see that causing, will try simulating
to see if a possible source of crackle when I power up with boards out
of chassis.
The pots are "digital" fashion. I was hoping the amp could be used
without the DSP board connected as owner only ever uses clean, will
check for that as well. Then try hot air and attack boards with nylon
tipped engraver tool (headphone monitoring), to see if that divines any
failed pbf joints, nothing suspect seen visually, plus ca change.
Then a matter of resoldering the usual suspects and keep fingers crossed.


Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fender G-DEC of 2010 N_Cook Electronics Repair 1 October 8th 14 04:23 PM
Ms. Excel 2010 - Introductory Shelly Cashman Series Office 2010 Tiger UK diy 0 October 3rd 11 08:09 AM
Fender Frontman 212R amp, 2010 N_Cook Electronics Repair 3 January 24th 11 12:14 PM
Paging Andy Champ Grimly Curmudgeon UK diy 4 August 13th 09 01:04 AM
Webb Champ 3VH manual? jw Metalworking 3 April 1st 09 03:16 AM


All times are GMT +1. The time now is 12:36 PM.

Powered by vBulletin® Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright 2004-2020 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"

 

Copyright © 2017