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

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

on the job teaching methods....
on the job teaching methods....
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
Thread Tools Search this Thread
Old 12th April 2009, 09:09 PM   #1
unclejed613 is offline unclejed613  United States
diyAudio Member
unclejed613's Avatar
Join Date: Dec 2006
Default on the job teaching methods....

somebody tell me if i went too far on this one?????

a coworker had a sony receiver on his bench, it had no display, so he replaced the DSP/CPU board. then he asked me to help him troubleshoot it. he's a bit of a newbie, and has dreams of management (so he really doesn't think he needs to retain any electronics theory...). so i come over, and he says "please don't embarass me by pointing out a blown fuse...." so i sit down and check the -V on the display tube.... nothing.... so i check the +15V feeding the inverter that makes the -V for the display tube, then i have him measure the +15V at the display board connector, nothing again, so i have him backtrack the +15V to the power supply and measure it there, again nothing, so i have him measure the +15V at the bridge rectifier, again nothing. so i have him measure the AC voltage on the bridge..... you guessed it-nothing. so i have him measure the AC coming from the transformer and the AC going into the transformer, finally tracing it back to .... you guessed it.... a blown fuse. and come to find out there's a blown output transistor and little bits of speaker wire strands laying across the amp board.......
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
spammer trap: spammers must die
  Reply With Quote
Old 12th April 2009, 09:39 PM   #2
Steerpike is offline Steerpike
diyAudio Member
Steerpike's Avatar
Join Date: Jan 2006
Location: Johannesburg, South Africa
All too often the general repair philiosophy is to replace parts until it works.
There is little in the way of troubleshooting and problem solving 'skills' around it seems.

It gives one a good feeling to use your talent to trace a fault, rather than the colour-by-numbers method.

I don't do this for a living, so I really don't care how long it takes me to find the problem, but I'd also rather find a blown transistor that I can replace for zero cost out of my 'spares' bin, instead of ordering a unique, costly microprocessor and finding it wasn't faulty after all.
  Reply With Quote


on the job teaching methods....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
Bias methods? flyinglemur Tubes / Valves 8 3rd April 2008 09:07 PM
Veneering methods KennyBradley Multi-Way 55 11th December 2006 11:46 AM
Best methods for I/V conversion? ezkcdude Digital Source 7 20th April 2006 01:14 PM
Balanced amp methods PWatts Solid State 6 26th June 2003 04:17 AM
water methods PWatts Multi-Way 0 25th June 2003 10:46 AM

New To Site? Need Help?

All times are GMT. The time now is 12:15 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio