2 Sep
2005
2 Sep
'05
4:27 p.m.
Greetings Dave,
Possibly helpful hints from a friend not on this list:
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Subject: Re: Intel MDS Series II IOC question (fwd)
Hi George,
My first thought is SCANBE.
My second thought is SCANBE.
My third thought is... can you guess?
I assume these are cheap and useless IC sockets.....
Replacing the SCANBE sockets with AUGAT barrel type on
the older IOC's
has always solved my 5 beep test problems. Making sure all socketed
components
are properly seated in reliable sockets. The manuals, flow charts, etc...
This reminds me of my Whitechapel MG1. The 'expensive' devices, CPU (32016),
FPU (32081), I/O processor (68121 IIRC), etc were all in turned-pin
sockets. The EPROMs were in cheap-n-nasty sockets. Replacing the latter
with turned-pin so;ved a lot of problems...
all say to replace the IOC if the 5 beeps test fails.
The manual called:
Darn board-swapper guides...
Customer Engineer Diagnostic System Test Operating
Instructions For
Series II Systems
(121619-001) may break down the 5 beep test, but I do not have a copy.
Tips for replacing the SCANBE sockets.
1. Pull the plastic housing of the SCANBE socket off the board.
2. Remove the mylar sheet from between the pins.
3. On the component side grab one of the pins with needle nose pliers
while heating same pin on the solder side, pull to remove.
Repeat for all pins.
4. Use solder wick to remove solder from holes and clean up.
I find one of the best ways to clean out PCB holes is to melt the solder
with an iron on the 'solder side' and use a solder sucker from the
component side.
5. Clean area with flux-off if needed.
6. Install AUGAT machine barrel socket.
7. Clean area with flux-off.
-tony