Caple C871i Bedienungsanleitung PDF herunterladen (Seite 391)

Apple II Computer Info

Getting to the PS circuit board involves some work. After removing the

mounting bolts, you will have to scooch up the board in order to get to the

bottom side. This will be easier if the wire bundle has been unwedged.

Another hurdle is soldering to the circuit board. Once the old leads

and excess solder are removed, you will probably find that the holes are

too small! A jeweler's screwdriver makes a good hand drill for enlarging

holes. (Drill from the circuit side. Be careful not to tear or dislodge the

printed circuit.)

The new leads should be routed through the unused fan slots. (If a fan

is attached, remove it. It's in the wrong place to do much good in cooling

your GS.)

Note: If you have a fan mounted to the PS and you wish to keep it, then, it

will be necessary to enlarge the original cable exit hole. A sheet metal

"munching" tool should let you do this without having to entirely remove

the PS circuit board. (Just be sure to catch all of the munched pieces!)

When routing the leads be careful not to place a twisting force on a

lead where it is soldered to the circuit board.

To get to each spronger (contact) in the plug, press on it through the

slot on the side near the wire end. This pushes up a small retaining tab so

that pulling on the attached lead will pull out the spronger.

Cut off the old lead, clean the end, and solder on the new lead. Press

the spronger back into the plug. To avoid mixups, it's best to complete the

process for each lead before doing the next.

When plugging in the power supply, take time to shape and arrange the

wires to minimize stress on the motherboard.

Motherboard Mod

Fatter +5, +12, and Ground leads should protect you power supply and

reduce circuit noise.

If audio noise in your stereo card output and/or system bombing due to

noise glitches were problems, they may be eliminated. A lot depends upon

which cards you've installed, which slots they are in, and whether your

IIgs is a ROM-01 or ROM-03.

The motherboard circuit traces supplying power to each Slot are fairly

skimpy, especially on ROM-01 boards. A heavy power user in Slot 7 can

produce significant noise up and down the entire Slot 'backplane'.

The cure is to remove the motherboard and run leads to a couple Slots

....

First, flip over the motherboard and get oriented. Below is a quickie

sketch showing the Power Connector points as well as key power pins for a

Slot. The view is from the _Bottom_ with the _Back_ of the motherboard

facing you:

Bottom of Motherboard

Power Connector Socket Slot

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 391 of 572

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