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From: werner@ut-ngp.UUCP (Werner Uhrig)
Newsgroups: net.micro.mac
Subject: Re: Jerky screen problem
Message-ID: <3085@ut-ngp.UUCP>
Date: Fri, 21-Mar-86 06:55:11 EST
Article-I.D.: ut-ngp.3085
Posted: Fri Mar 21 06:55:11 1986
Date-Received: Sat, 22-Mar-86 23:20:21 EST
References: <3079@ut-ngp.UUCP> <5220038@acf4.UUCP>
Organization: UTexas Computation Center, Austin, Texas
Lines: 40

Anyone with this symptom should check and adjust the 5 and 9 Volt voltage
level coming off the analog board.  As a matter of fact, everyone should
do that, just for peace of mind.  This is especially important after an
upgrade to 512K or to Megabytes.

My Mickey "acted up" after I upgraded to 2Meg and when I checked, my
5 Volt level at the plug where the ribbon-cable coming from the main board
connects into the analog board, showed only 4.3 Volts.

From what I have seen, *EVERYONE* should check (have someone check) and
adjust all settings on the analog board right after purchase and anytime
the machine is open and had not been checked for a while.  Of course,
if you are still in warranty or if you are not absolutely sure what you are
doing, I encourage you to pay the few bucks this might cost you to have a
certified Apple tech do this for you.  On the other hand, I myself don't
really have much trust and confidence in the "run of the mill" (lawyer,
doctor, car-mechanic) technicians, but at least you can sue them (maybe),
whereas you can't even kick yourself in the rear effectively....  ((-:

below I enclose a list of the pin-assignments of the ribbon-cable connecting
the analog board with the digital (main) board
	(copied from Beck-Tech's poster-schematics)

	PIN	ASSIGNMENT

	1	VIDEO
	3	H SYNC
	4	SOUND
	5	V SYNC
	6	+5V DC
	7	GND
	8	-12V DC
	9	GND
	10	+12V DC
	11	BATTERY


		I hope this helps,		---Werner

Disclaimers:   YES - ALL