OK, both my blowers are getting R&R this week, but I’ve run into
a problem.
One of the small circuit boards the resistor and all the wires and
diodes are connected to, lost 2 small electronic thingies. One is
square, very small and yellow with the numbers A1C 103M on it.
(there is an identical part soldered to the opposite side)
The other is shaped like a miniature 55-gallon drum; it’s black
and the numbers KA85C 6.3v. My left blower is complete and ran
fine, but the right side blower was missing these two pieces and
only ran on High. The local electronic shops don’t seem to want to
help-what can I do? I will replace the Darlingtons and the relays
for insurance but what about these things?!!–
jklnhyde
sneads ferry,nc, United States
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In reply to a message from jklnhyde sent Mon 20 Sep 2004:
JK,
The two little devices mounted on the darlington transistor are
capacitors. Capacitors have some similarity to minature batteries,
although they hold a charge for only a short time. The one that
looks like a barrel is a 25 uf (uf stands for microfarads), and it
is rated at six volts. A higher voltage capacitor can be used. It
has a black stripe near to one of its wires. The black stripe
marks the negative wire. It must be connected correctly. The
little capacitor 103m can be connected anyway around. I have yet
to measure its value but probably its around 100 to 150 pf (pf
stands for picofarads). Voltage rating will not be important for
that one.
If you have forgotten which way the 25uf capacitor is connected,
then hold the board, looking at the soldered side, with the wires
connected to the left. The 25uf capacitor is mounted on the left
of the transistor. The black stripe will be on its lower side.
They re probably there to protect the transistor from parasitic
occillation - something that has a habit of destroying transistors.
The capacitors are cheap as chips as can be obtained from any
electrical component outlet. The bigger one is commonly used in
radios and stereo sets and can be scavenged from broken sets. The
little one rarely fails, but the big one has been known to fail.
There are a few digital multimeters which have a facility for
measuring capacitors. If you have one then the value of the 25uf
capacitor can be + or - 20%.
Hope that helps.
Regards,
Peter Parsons, UK
Daimler 3.6–
peter Parsons
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