User`s guide

The power supply in the //e's I fixed is made by Dyna Comp, Inc. for Apple,
model no: 699-0136. Ratings are as follows: Input 240V/50Hz, Output +5V/4A,
+12V/1A, -5V/.25A, -12V/.25A.
Measuring the voltages on the //e motherboard I get +5V= +1.3V, +12V=
+2.8V, -5V= -4.3V. If I disconnect the power supply connector from the
motherboard and switch it back on, I measure the correct voltages on the
connector.
The fault is caused by one or two failed 1uF 35V 85deg small electrolytics.
The location of each is as follows:
o- 103mm (4.1") from the back, and 27mm (1") from the left of the circuit board
o- 163mm (6.4") from the back, and 10mm (0.4") from the left of the circuit
board.
I checked each of the ones I removed. they measured less than .05uF.
The fix is to replace each capacitor with a 1uF 35V or higher rated
electrolytic-- if there is no "+" indication on the circuit board, mark the plus
side before removing the old capacitor. I used 1uF 50V 85deg as that's what was
in my parts bin. (You may need to clean up some gunk leaked onto the board by
the old capacitors.)
______________________________
From: Stephen Shaw
These are called "kickstart capacitors" in switched mode power supply
(SMPS) technology circuit descriptions. If you ever get an SMPS in with
tripping or low output voltage or amperage, change all small value electrolytic
capacitors (below 330uF and 35v) with high temperature capacitors (105 degree
centigrade).
______________________________
From: O Aaland
012- My Apple IIe usually fails to turn on! I have to
turn its power switch on and off several times and
sometimes wait a long time before it finally powers up!
If the power supply you are working on is an ASTEC brand the most common
problem is the 10V 220 uf capacitor located about 1 inch to the rear and left of
the transformer. I find this to be the cause in about 80 pecent of the ones I
repair. Use a 25V 220uf capacitor as a replacement and chances are real good
that it will not fail again.
______________________________
From: Stephen Shaw