Re: IIGS clock -- which chip is it?

[Michael Black <blackm00@CAM.ORG>]

I'll try to remember to look in my GS later to see if any IC jumps out
at me as the clock.

As for surface mount, one thing you might do is find some scrap boards
with SMDs, and practice unsoldering and soldering on them.  Better to
practice on a board you don't care about than worry about damaging
something of value.

I bought a heat gun (the kind meant for stripping paint) specifically for
taking parts of scrap boards. I'm not sure I'd use it on a board I cared
about without more practice, but it will get parts off scrap boards with
ease.  I did use it to fix a SIMM that I bought.  It didn't work, the
error code on my Mac told me where to look, and heating up the connections
on the IC on the SIMM fixed the flaky problem.  I also turned some 256K
SIMMs into 1M Simms once, using some 256Ks someone gave me and some memory
I took off a scrap motherboard.  I used the heat gun to get the ICs off
the boards, and then used a combination of soldering iron and heat gun to
get the SIMMs going.  It was the first time I dealt with SMD, and in
retrospect I should have practiced.  One of the big tricks is keeping the
IC aligned with the circuit board.

      Michael


On 10 Jan 1999, stephen e buggie wrote:

> 		REPLACEMENT OF CLOCK CHIP ON IIGS MOTHERBOARD
>                 =============================================
> 
> 
> One of my IIgs computers has a jammed clock!  I replaced the battery ---
> still doesn't advance the clock.  The control panel settings remain
> stable, so I deduce that the clock is bad.
> 
> WHICH IC CHIP IS THE CLOCK?  I also have a scrapped IIgs motherboard from
> which I might desolder the clock, and fit it into the working GS
> motherboard.
> 
> BTW, If the chip is a surface-mounted part, I'll try copper desioldering
> braid to remove it.  But if anyone else has worked with surface-mounted
> components, any help on soldering techniques will be appreciated!   I
> receive the magazine, SURFACE MOUNT TECHNOLOGY, but its all manufacturing
> topics --- nothing for hardware hackers..... 8-(    Steve Buggie
> 
> 
>   Stephen Buggie                                  |Sorry sir, "APPLE II |
>   Psychology Dept.                                |  FOR DUMMIES"  was  |
>   Univ. of New Mexico, Gallup                     |   never published;  |
>   200 College Rd.                                 |could you get the IBM|
>   Gallup, NM  87301                               |   version instead?  |
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>  ** buggie@unm.edu                    voice: (505) 863-7504 or 863-2390 **
>  **              Apple IIgs/IIe/IIe;  Mac SE/Classic                    **
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> 
> 
>