Re: SDISC-Replacement
2001-05-10 by Dieter Waechter
Hi Howard!
> 1. PPC
> Digitech is sending me a SDISC II for the Motherboard. I don't know how to
> replace a PLCC- chip .... Please Enlighten me!
Digitech always want to sell their SDISC II,
because they have only less SDISC I on stock (I think) .... "The SDISC II was a
drop in replacement" Randy Thorderson wrote once... But OK. The SDISC
II works too.
How to replace it:
Store a Bulk- Dump. (This is not necessary, but
only for safety)
Pull all plugs out of the GSP.
Remove the six side-panel screws
Remove the rear-panel top center screw
Remove the front-panel top center hex- bolt
Remove the lid
Pull the PPC 210
Pull all plugs out of the GSP.
Remove the six side-panel screws
Remove the rear-panel top center screw
Remove the front-panel top center hex- bolt
Remove the lid
Pull the PPC 210
Now you need a PLCC84 - Pulling- tool.
It looks so:
How to use it:
SO:
Don't buy that tool! Lend it from any computer-
store or radio/TV- workshop.
If you can't get it... dont worry. Take a
very small screwdriver and carefully (!) pull out the SDISC- processor.
There are two small holes on 2 corners of the socket. Put in the
screwdriver only(!) on that two holes!!! Very
important!!!!
Now take the new SDISC and press it carefully into
the socket. Please don't touch the pins of the processor (static protection).
Make sure that you put it in in the right direction!!. There is a chamfered
corner. It must coincide to the socket. The writing must bu upside of
course.
Mount the PPC 210
Mount the lid
That's it.
> 2. Further Info to crinkling sound:
> "There is a SMD coil soldered beneath the 30 pole PPC-connecteor. It's coded L
> 15."Do you mean that I have to remove the entire circuit board to be able to
> see what's below? I am not able to see this coil from just visual inspection.
> 2. Further Info to crinkling sound:
> "There is a SMD coil soldered beneath the 30 pole PPC-connecteor. It's coded L
> 15."Do you mean that I have to remove the entire circuit board to be able to
> see what's below? I am not able to see this coil from just visual inspection.
UUUUPS.... I'm so sorry.... It's not L 15 ......
It's L 27.
;
>Do you mean that I have to remove the entire
circuit board to be able to
> see what's below?
> see what's below?
No! You find it so: Localize the PPC 210. Localize
the 30 pin- connector where the PPC210 is mounted on. The little SMD- Coil is
next to that 30 pin connector. There is printed L27 on the mainboard. But
that text "L27" stands not next to the coil. It stands a little bit remote to
the coil. I have no foto .... But it's easy to find. Its about 2 mm long and 1
mm wide and 0.8 mm thick. If "100" is printed on it. It's OK. If not- contact
me!
>
> 3. EPROMS ok ?
> I bought them... they must be OK.
>
OK.
Dieter.