Intel MDS Series II IOC question

[Tony Duell]

> 
> Greetings Dave,
> 
> 
> Possibly helpful hints from a friend not on this list:
> ------------
> 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