IBM PC Server 500

From: jpero_at_sympatico.ca <(jpero_at_sympatico.ca)>
Date: Thu Feb 21 10:06:47 2002

> [1] Who do they think they're kidding?
>
> > getting into things too.
>
> True. But if I am taking the cover off a PSU, presumably I want to work
> inside it. In which case I can clean out the swarf.
>
> -tony

Just what I needed to send in my findings today while working for
consumer depot service for my work experience (that's the shop name),
 Boss and I talked about what he have seen from college's churning
out students filled with knowledge but very little troubleshooting
skills *especially* at component level and wrong type of skills to
boot! The area students trained with were for peecee area.

1. Newish monitor sent in w/ complaint sheet stating dead. Powers up
fine huh? Now on testing....to see if owner might be wrong.

2. Service manual for samsung 76V under warrenty flowsheet says if no
PSU voltages present check & replace bunch of transistors and
expensive ICs, still not fixed, replace whole board. (!!) That
problem vexed me bec paper doesn't agree w/ what I find then turned
out that poly 100nf capacitor was shorted far down the power chain
(on CRT board) 70V rail for that intergrated tube gun amps in T220
9pin package. PSU was very touchy to current level that how were no
burn marks. I don't like shot-gun swapping chips idea. DMM and CRT
board unplugged from mainboard gave short truth away. Did all
tracking right on the board itself without schematic. I find using
the schematic didn't do good for me and usually slows me down.

3. 12 years old TV playing but soundlessly. 36V for audio has track
break, leapfrogged across length of that track w/ dmm till I found
the break (right at one solder pad crack is invisible). But didn't
brother being dainty w/ it, quickly patched in one piece of long
patch wire, making 3 connections with minimum amount of wire since I
don't like loops. Got sound in minutes. Oh yeah, blackened crumbly
glue scraped off.

4. Newish monitor under warrenty, CRT socket partly plugged in from
factory, Samsung uses crt board unit clamp w/ silicone grommet around
CRT neck, very nice idea but that gromment was stuck against edge of
thick flame-proof tape. Worked crt thing over that tape's edge and
clamped down, now fixed.

Cheers,

Wizard
Received on Thu Feb 21 2002 - 10:06:47 GMT