[Kenwood] TS-940S Dead

[Dennis Younker NE6I]

As a follow up to this, it was suggested to me that the AVR board might have 
problems. A little closer inspection makes me think that it is the source of 
the motorboating sound. Not sure why that board would make such a sound but 
maybe someone can enlighten me.

Page 85 of the service manual list the various voltages and points to check 
on this board. What I am finding is that the +10 and +5 VDC points are all 
measuring about +2 and +1 VDC respectively. All other voltages are good. It 
appears on the schematic that both voltage supplies are derived from 
connector 6 on the board, and Q104 and D10-D13. I have 18 VDC at pin 2 of 
this connector, and I'm assuming this is good when unloaded (plug is removed 
from the connector on the board). Does this point to Q104 as the culprit or 
should I be looking at something else? Connector 6 and its connections are 
right on the fold of my manual so some of those lines are difficult to make 
out.

--Dennis NE6I

----- Original Message ----- 
From: "Dennis Younker NE6I" <ne6i at cox.net>
To: <kenwood at mailman.qth.net>
Sent: Sunday, December 08, 2013 2:48 PM
Subject: [Kenwood] TS-940S Dead


>I was doing a little operating today with one of  my faithful 940s. I had a 
>made a few contacts, took a break (45 mins to an hour), and came back to 
>tune around some more. While listening to a QSO, the 940 suddenly went 
>dead. Lights out. Nothing but a sort of motor boat sound coming from it. I 
>powered down, unplugged things, powered up. Same thing. With the covers 
>off, I don't see anything obvious. No burned components that I can see, no 
>burnt smell, fuse on rear panel is good. The motor boat sound seems to be 
>coming from the left rear (when viewing from the front of the transceiver). 
>And it seems to be coming from beneath the power transformer, of all 
>places.
>
> Does anyone have any suggestions on what to look for?
>
> --Dennis NE6I
>
>
>
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