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PE1AEQ > MAC 11.09.96 00:24l 29 Lines 1088 Bytes #999 (0) @ EU
BID : 2135-PE1AEQ
Read: GUEST DK3EL
Subj: Help powersupply mac+
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Sent: 960910/2209Z @:PI8GCB.#NH2.NLD.EU #:29378 [Bussum] $:2135-PE1AEQ
From: PE1AEQ@PI8GCB.#NH2.NLD.EU
To : MAC@EU
[¯¯¯ TST HOST 1.43a, UTC diff:5, Local time: Tue Sep 10 22:39:42 1996 ®®®]
Hello,
im am quite handicapped without my mac+.
The powersupply is completely "dead" without a cause.
The switchingtransistor has 300 volts on it but gets no pulses to run.
Even switching it on and off doesn't give any pulse secondary on the
transformer.
I dont think it comes from the optocoupler as there is no power secondary.
There are two transistors left on 2n3906 and a tag87(thyristor)
They get no voltages but arent broken either.
I beleave this is a Self Oscillating Power Supply.
The Problem is i cannot find how it is supposed to start.
Usually there is a 470K resistor that gives the first push and the
swinging takes over.
Can you help?
Any help will be appreciated.
Please send me a message back.
/ack
ÖÄ¿ÖÄ¿Ú¿ ÖÄ¿ÖÄ¿ÖÄ¿ * Johan QTH Zeist *
ÇÄÙÇÄÙ ³ ÇÄ´ÇÄÙº ³ * TSTHost 1.43 * o
Ð ÓÄÙÄÁ Ð ÁÓÄÙÓÄ\ * TFX_uart +Baycom * _[//\_
*PE1AEQ@PI8GCB.#NH2.NLD.EU* (_)\/(_)
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