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Date Posted: 09:56:06 05/21/01 Mon
Author: MISUTHiKU
Subject: Re: hello!(from Japan)
In reply to: Stuart Bell 's message, "Re: hello!(from Japan)" on 08:55:15 05/21/01 Mon

This is originally shown by Mr.Tak.(Takashi Imai).

Original CC
Resolution 512x384 (CCII 560x384)
Horizontal frequency 24.48kHz
(Horizontal Scan Voltage +60V)
Vertical frequency 60.15kHz
13"-mode
Resolution 640x480
Horizontal frequency 35.0kHz (much higher than 24.48kHz)
(Horizontal Scan Voltage after mod +84V<<< Vertical frequency 66.67kHz
http://www.bekkoame.ne.jp/~t-imai/cce5.html
VGA-mode
Resolution 640x480
Horizontal frequency 31.5kHz (slightly higher than 24.48kHz)
(Horizontal Scan Voltage after mod +68.4V<<< Vertical frequency 60.0kHz
http://www.bekkoame.ne.jp/~t-imai/ccja5.html
(This page is written in Japanese. But you see the image.)

We have to raise horizontal scan voltage to get 640x480 resolution.
Then there are only two ways 60+24V or 60+8.4V.
60+8.4V is short for 13"-mode, but enough for VGA-mode.
But VGA mode is impossible with CC,CCII,PF275,LC520,LC550 logic board.

If you want to get 60+24V, you should connect 8pin to 10pin at ZP1.
If you want to get 60+8.4V, you should connect 8pin to 12pin at ZP1.
These are the modifications for changing horizontal scan voltage.

You should need changing the monitor sense line.
J78,79 mod, or, cutting 20pin & jumper, (for 13"-mode)
modification on flat cable, or, sealing edge connecter & jumper (for VGA-mode)
What is the monitor sense line?
Please see this page.
http://til.info.apple.com/techinfo.nsf/artnum/n15987

S.Watanabe(MISUTHiKU)

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