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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 jeweler'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 slime near the base.

If you find something like this, the suspect capacitor should be replaced by

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 404 of 572

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