Caple C871i Bedienungsanleitung PDF herunterladen (Seite 374)

Apple II Computer Info

Bad Power Cord

Unplug and replug the power cord at the point where it connects to

the IIe. Turn ON power. Try wiggling the power cord. If the Power Supply

comes ON at any time, try substituting a power cord from a known-working

IIe. If this fixes the problem, you can be pretty sure that the problem was

a power cord with a broken wire.

Poor Power Supply Connector Connection

Unplug and re-plug the Power Supply cable to the motherboard. Turn ON

power. If the machine seems to respond, or responds when the connector is

wiggled, you probably have a dirty or loose connection.

Clean the power supply plug and socket with an alcohol swab. Using

long-nosed pliers slightly re-crimp the 'holes' on the socket (or, insert a

jewler's screwdriver into the space between each hole and the plastic casing

and twist). The idea is to restore a firm grip for all contacts.

Another possibility is a loose or broken socket solder connection to

the motherboard. The repair is to remove the motherboard and re-solder the

connections to the socket.

Bad Switch

It is fairly easy to identify a bad switch-- it will, usually, not snap

cleanly into position, feel crunchy, and/or have a burn spot. The repair is

to replace the switch with some AC power switch that will fit. Or, you can

permanently connect the switched lines and add an in-line switch to the

power cord.

Blown Fuse

Some power supplies may have a fuse. Open the power supply. Look for a

fuse mounted to the circuit board. If there is one, check it. An Ohm meter can

be used to check for continuity if it is not obvious that the fuse is blown.

If the fuse is blown, replace it.

Bad "Globar" Element

Look toward the end where the power cord is connected. Somewhere close

to the place where wires from the switch go to the circuit board there

should be a small disk-shaped component which is not a disk capacitor.

Probably, it will be black with no markings. This is a "globar" resistor.

Check it to be sure that it is not cracked and that both leads are really

connected to the disk.

If the globar element is broken or if a lead has popped off, you will

need to get a replacement from an electronics supply shop. (Tell the shop

person where the globar resister comes from and describe its size.)

Blown Electrolytic Capacitor(s)

On the end of the circuit board near the Switch are some relatively

large electrolytic capacitors (typically these are tubular aluminum things

with shrink-wrapped grey or light-green covers on which there are markings).

Usually, they are the same size and have the same uF value and Voltage

rating. One (or more) of these may be obviously blown or may just show some

Apple II Computer Technical Information : Apple II Family Hardware Info

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