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Apple II Computer Info

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### Created : Wednesday, June 10, 1998 Modified: Wednesday, June 10, 1998

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From: Rubywand <[email protected]>

Newsgroups: comp.sys.apple2

Subject: Re: help with broken GS

Date: Wed, 10 Jun 1998 05:44:16 -0500

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Jon Christopher Co writes ...

> I was using my GS and smoke started coming out from the inside. after

> opening it up my best guess tells me the smoke came from an 8 legged

> chip right under the power supply at the upper leftmost corner (right

> behind the composite video connector and ADB jack). Right now the

> computer still boots up, but will not respond to any ADB device

> (keyboard). can anybody identify what this chip is? i also noticed

> there is a slight bump in the middle.. is this normal or is it > supposed to be

perfectly flat?

My guess is that the chip or module you are talking about is L2

"D-15C". This is an 8-pin thing with 4 inductors (coils). Three

inductors are used. They are in series with the ADB Desktop connector.

Evidently, one of the inductors burned out. This would explain the

loss of ADB functioning and the bump on the module.

Repairing the burned out inductor should be fairly easy, although

it will probably be necessary to remove the motherboard. You could take

a length of thin wire-- like wirewrap wire-- make a small coil, and

connect it across the terminals of the module corresponding to the

burned-out inductor.

The three inductors run ...

pin 1 to pin 8

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 22 of 572

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 571 572

Caple C871i Manuale Utente Pagina 22

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