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VE3TMT
Max Donoghue
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VE3TMT Ham Since 1990
Canada

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Information

Other Callsigns
Also licensed as VA3ZG

My Ham Radio Interests

Equipment
Yaesu FT-990
Kenwood SP-940
Kenwood SM-220
Cushcraft A3S
Alpha Delta DX-B sloper
MFJ993-B
Realistic PRO-2037 Scanner
Swan WM-3000 Peak Reading Meter
Yaesu G450XL rotor
Delhi 32' free standing tower

Other Interests

Clubs

Latest changes to the shack

From VE3TMT

1/6/2013 4:16:10 PM (0 comments) Add a commentAdd Comment


Well I see it has been over three years since my last post. My how time flies! The 756PRO is gone, now running a Kenwood TS940S. When I got it I was told it was a 9mil series radio so I thought most of the issues would have been resolved by Kenwood. Well it looks more and more like it was a 7mil radio with 9mil covers. Had many issues with it since I got it in March of 2012.

First off I had to recap the AVR board. Put new beefier diodes in at the same time. Then I had the erratic display problem, which took a long time to track down. Turned out to be IC2 on the Control A unit, a well documented issue with the earlier radios. I didn't trust my ability to remove the ROM socket as suggested by Kenwood, so I applied a thin coat of solder to each of the pins on the ROM and reflowed new solder through the holes on the board. This has finally solved the problem. I have also removed just about every board in the radio and resoldered just about every solder pad I possibly could, a very long and tedious procedure, but it is paying off. The wax from the VCO was removed as was the black pad. I have replaced the meter and sub-display lamps with LED's and it looks great.

Last week I finally got around to replacing the pass transistors. Rather than wait for them to go, which I hear they will, it is just a matter of time. I decided to swap them out for MJ15003's. These are much heavier rated units and it has solved the problem I was having with the 28.5V line fluctuating, oscillating if you will.

Spent some time in the ARRL Round Up RTTY contest this weekend and had a lot of fun. The 940 performed admirably.


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