Apple II Computer Info
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### FILE : peaking.coil
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### Created : Sunday, January 14, 1996 Modified: Sunday, January 14, 1996
### File Type: "TEXT" File Creator: "LMAN"
### File Size: 5077 bytes 4 KB
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Path: news.weeg.uiowa.edu!news.uiowa.edu!hobbes.physics.uiowa.edu!zaphod.mps.ohio-
state.edu!caen!uunet!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!yale!not-for-mail
Newsgroups: comp.sys.apple2
Subject: Re: Solid red monitor screen
Date: 30 Nov 1992 17:22:51 -0500
Organization: Yale U.
Lines: 111
Distribution: world
NNTP-Posting-Host: scorpion.zoo2.cs.yale.edu
Here's a more detailed possible solution:
I still have to get around to doing this.
The following message is from last year sometime.
I never did have time to get to my RGB monitor. But I found
this on AOL this week:
"It isn't easy, being green..."
Kermit, ca. 1982
I'd started to think my Apple 2GS RGB monitor was
immortal. It had always worked for me just as it did when I
first turned it on in 1987 or thereabouts. Then without any
precursor warnings my monitor's screen lit up with a
hurt-your-eyes green raster and no video. 50-dollar bills
flashed before my eyes.
I'm no stranger to tv servicing, so there was no
question but that I 'd give it my best effort before
spending the big bucks for repair or replacement. I hit the
wall without service data. The local electronics-supply
dealer told me, "Nah, there is no Sams Photofact for the
Apple 2GS monitor... Apple never did sell many 2GSs, so
Sams didn't do anything for the 2GS!" I drew myself to my
full height, started to tell him about the millions of Apple
2GS computers still in use then said, "Ok..." and left the
store. I'm tired of arguing the point.
I made my own Sams by tracing out the pc-board
circuitry. A boring but necessary step. The paper
schematic helped to make sense out of the voltage readings
on the pc board's various test points.
The excess greenness was the result of an open peaking
coil. Peaking coils are small inductors used to extend the
Apple II Computer Technical Information : Apple II Family Hardware Info
ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 362 of 572
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