[Collins] Re: Collins Digest, Vol 10, Issue 1

[w4okw]

Hello Uli,

Check the output of the +24v regulated power supply in the small shielded
box near the power supply board.  I had this problem recently and a new 1.5
mfd electrolytic fixed it.  I believe in some of the older  units this was
20v instead of 24v.  There is a 24V zener on the outside of the power supply
that may also be the problem.  If the 24v ps is the problem and you do not
have a schematic, I can send you a copy.  Let me know.

73 de Tom/W4OKW
-------------original message------------------------
Date: Tue, 1 Feb 2005 08:11:28 +0100
From: Graf Ulrich Com MD PD ST 2 ULM 1 <ulrichgraf at siemens.com>
Subject: [Collins] KWM-380 synthesizer failure

Good morning,

I've got a sick KWM-380 of a friend on my table. When I switch it on it
beeps three times as normal to signalize a locked pll. But then it starts
beeping continuously with a kind of distorted, non sinusoudal tone.
Frequency display shows zeros with an open 0 at the first place. Frequency
tuning is not possible. Starting testing according to the manual allows
first steps only which all seem to be ok. Then manual asks for frequency
tuning to specific settings which is not passible. Any ideas where and how
to go on from that point?

73 Uli, DK4SX