Caple C871i Manual do Utilizador descarregar pdf (Página 300)

100

101

Apple II Computer Info

the middle of their range, with the picture at your

preferred viewing brightness.

If you can get things set the way you like it, great. Now

try testing it while it's still operating. Adjust the

brightness control on the side up and down. If you still get

'blooming', the transformer is going bad and will need to be

replaced. It will probably cost more than the monitor is

worth. Ask a tech how much to change your Hi-V transformer,

and decide. If no matter what you do with the FOCUS, you

still get a fuzzy picture, your CRT is probably 'gassy',

that is losing vacuum. This is definitely more costly to

replace than to get a new one, unless you can get a tube

from another monitor and replace it yourself.

Once you have things where you want them, turn it all off,

disconnect everything, and reassemble the monitor. Your

repair job is done. If it worked, you just saved yourself

somewhere between $50 and $150.

If the brightness still does not come up enough, there's

one more thing that can be tried. The electron guns can

be 'burned off', that is hooked up to a tube tester which

can put a great deal of voltage through the guns and burn

off any oxides on the gun filaments. This must be done by

someone with this device, in other words a tech. This is

at best a temporary fix, and is equivalent to the "picture

tube brighteners" you can purchase. If this needs to be

done, you're working with a limited lifetime on the tube

as is, and doing this may well shorten that lifetime.

Any questions, or anything not clear about these

instructions, write me and I'll clarify.

[email protected] The Doctor is on.

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Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 300 of 572

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Caple C871i Manual do Utilizador Página 300

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