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From: grr@cbmvax.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Adjust 1080 Horiz. width?
Message-ID: <1555@cbmvax.cbmvax.cbm.UUCP>
Date: Sat, 14-Mar-87 23:33:03 EST
Article-I.D.: cbmvax.1555
Posted: Sat Mar 14 23:33:03 1987
Date-Received: Sun, 15-Mar-87 08:11:26 EST
References: <17834@ucbvax.BERKELEY.EDU> <579@hao.UCAR.EDU>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 64
Keywords: 1080, monitor, screen width, morerows
Summary: don't...take it to a repair shop

In article <579@hao.UCAR.EDU> hull@hao.UCAR.EDU (Howard Hull) writes:
>
>The horizontal width adjustment for the Amiga 1080 monitor is a slug-tuned coil
>inside the case.  Not only is it inside the case, but it is positioned almost
>directly under the rear portion of the bell-shaped video display tube.

>
>21. Load your favorite word processing program, and compose a letter to
>    Commodore Amiga thanking them for making the Amiga possible, and commending
>    them for the ease they have provided for the horizontal positioning and
>    vertical size adjustments.  Let them know in your most colorful language
>    how easy it was to adjust the horizontal width.  Ask them where the hell
>    the horizontal linearity control is.  Presto, you're done.
>
>    You just have to become psychologically prepared, in the event of a
>    misadventure, to get a powerful shock.  If you have a weak heart, don't
>    attempt this adjustment.  You simply have to think ahead of time about
>    what your involuntary nervous system is going to make you do.  You must
>    not drop the monitor; be ready to hang on until the pain subsides, as it
>    very soon will.  You must at all times place your hands where when you
>    react, you will not embed any of the sharp electronic parts into your
>    wrist.
>						Best Regards,   Howard Hull


Needless to say, Commodore *does not* recommend that untrained personnel
attempt internal monitor adjustments.

YOU CAN BE KILLED OR SERIOUSLY INJURED -

1) shock via contact with the High Voltage on the CRT Anode and Focus circuits.

2) shock via contact with high voltages in the horizontal deflection circuits.

3) shock via contact with line voltage present within the case.

4) trauma due to involuntary muscle contractions attendent to such shock -
   you have *no* control over your muscles under such conditions and can
   easily cut yourself severly during the shock or when you try to jerk
   away afterwards.

5) truma due to flying glass from CRT implosions consequent to your knocking
   the monitor onto the floor.

The voltages remain for many minutes after power is disconnected and are not
necessarily completly discharged by a single arc.

The horizontal width adjustment is not user accessable because adjustment
outside the normal operating range may result in damage to the monitor and
because the horizontal width adjustment can also affect the High Voltage
level, which is an X-RAY safety related issue.

Have I covered it all?  I'm not sure that Howard has done anybody a service
with his detailed instructions, despite all the warnings.  Anyone has enough
training and/or knowledge to do this safely will not need such detailed
instructions.  Anyone else would be much better off to take the monitor and
instructions down to their local TV or Audio-Visual repair shop.  The service
technicicans can make the adjustments in short order and are conversant with
the safety issues involved, probably through direct and unpleasant experience.

-- 
George Robbins - now working for,	uucp: {ihnp4|seismo|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)