Caple C871i Manual de usuario descargar pdf (Pagina 299)

Apple II Computer Info

the high voltage wire. In fact, it's the VERY high voltage

wire. There's enough juice in this thing when operating

to knock you down and possibly kill you. Even when turned

off, enough can be stored in this area to really bite you.

This is why I suggest waiting a day or two before messing

with this. It gives the power time to drain off.

This big wire goes into the top of a plastic device which

is partially covered with a metal cage. This is the high

voltage transformer. Facing the rear, you will see two small

adjustment stems, one above the other. The upper one is

marked FOCUS, the lower one SCREEN. This is on the collar

around the stem.

If your problem is increasing darkness, the SCREEN control

is the one you'll want to work with mostly. If your display

is out of focus, obviously you'll work with the focus

control. In either case, you may have to adjust both of them

somewhat. Before you do anything else, MARK THEM. Use a

pencil, and mark the control and the body of the transformer

so you can set things back the way they were in case you get

too messed up.

Now stop and think. The rest requires adjusting the high

voltage controls (THOUSANDS of volts) with the set turned

on. This is DANGEROUS. If this bother you, reassemble it

now and do not go any farther. Take it to a tech. They

should be able to do the rest of this for a minimum labor

charge. Want to continue? OK, let's go.

Set up the monitor with the back still off and slid to the

side, and connect both the power and the signal cable from

the computer. Set it up so that you can work with plenty of

room to move around the back. Set up a mirror in front of

the screen, so you can see what's going on with the picture

while you make adjustments without having to crane around to

look at the screen. This would cause you to be in a position

where you are not able to see your hands while working, and

this is the best way to get bit. DO NOT, under ANY

CIRCUMSTANCES try to work on anything without being able to

see your hands.

Now, fire it up, and give yourself a familiar screen such as

Finder, ProSel menu, whatever. Adjust the mirror so you can

see the screen clearly from behind the monitor.

Make sure your brightness and contrast controls are set back

where they were before you cleaned them. Now, using a

plastic handled, if not *entirely* plastic, screwdriver,

slowly adjust the control on the back of the transformer.

KEEP AN EYE ON YOUR HANDS. Do not come into contact with

anything other than the tool handle. Watch the mirror for

changes in the picture. Adjust SCREEN first if the problem

is mostly brightness. Adjust FOCUS if the picture is fuzzy.

Adjust them both as necessary to obtain the best picture.

You may want to adjust the brightness and contrast controls

down while doing this, because you may have over time moved

them up to compensate for deterioration. Try to get them in

Apple II Computer Technical Information : Apple II Family Hardware Info

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