TS-930s transmit problem
 

I have a TS-930s That has been in storage for 13 years. I fired it up and it receives fine. Everything seems in good shape except there is no RF output. In the tune mode the VC reads almost full scale where the IC reads low at about 1a. On CW there is no output and I get the same meter readings.

It has been so long since I have used the radio can anyone tell me what I am missing? Oh Yes, the carrier is all the way up. hi hi

I am getting real frustrated. I have been off the air the same amount of time the rig has been and really want to get back on. I can use an old 830 I have here but it's controls are so corroded I am going to have to go inside and attempt to clean them.

Any help would be appreciated. Many thanks,

Tim, KQ8M
kq8m(at)kq8m.net

TS-930s transmit problem
 

I just repaired a TS-930, that had the RF PA driver transistors blow
up due
to overheating of the power supply.


your VC goes full scale ? ? ! ! ! ! ! ! up to 42 votls ! ! !
it should go to 28 Volts.

it sounds like the power supply pass transistors failed, and shorted
out, ( due to heat )
and put the 40 volts to the RF Final PA. This will blow the driver
transistors.
A common problem in this radio.

are the fans working? it is important that the fan to the power
supply comes on,
or the power supply will over heat, or results I just mentioned will
happen.

what is the serial number to your radio ? ?

Kenwood added to the power supply circuit, later in production,
but it will not help the overheating problem.

TS-930s transmit problem
 

"Tim" wrote in message
...

I have a TS-930s That has been in storage for 13 years. I fired it up and
it receives fine. Everything seems in good shape except there is no RF
output. In the tune mode the VC reads almost full scale where the IC reads
low at about 1a. On CW there is no output and I get the same meter
readings.

I am getting real frustrated. I have been off the air the same amount of
time the rig has been and really want to get back on. I can use an old 830
I have here but it's controls are so corroded I am going to have to go
inside and attempt to clean them.

Any help would be appreciated. Many thanks,

Tim -

Kenwood released 15 service bulletins for the TS-930S, while it was in
production.
Here are some of them:
http://www.qsl.net/ki4nr/kenwood/

Original soldering and power supply issues are often mentioned in repairs
for this radio.
Personally, I would perform a close 'visual' inspection of the electrolytic
capacitors and components in the power supply section.
Some additional resources and reference materials:

W6NL/HC8L, D.B. Leeson's TS-930 notes (2001) - Adobe Acrobat
http://www.kkn.net/~k5tr/ts930fix/w6nl930.pdf

N0SS, Tom Hammond - TS-930 digital board
http://www.kkn.net/~k5tr/ts930fix/ts930doc.pdf

Piexx has an upgraded microprocessor board for the TS-930
http://www.piexx.com/index.p....s_id=25

KI4NR, John Bolduc (LPC Wireless) - Phone 386-774-9921
http://www.eham.net/reviews/detail/5210
was performing TS-930 and TS-940 repairs,
BUT check with him (he may have stopped recently, due to health).
http://www.qsl.net/ki4nr/index.htm

Clif Holland at Avvid is a good resource -- and is again accepting radios
for service.

w9gb

TS-830
 

"Tim" wrote in message
...

I have been off the air the same amount of time the rig has been and
really want to get back on. I can use an old 830 I have here but it's
controls are so corroded I am going to have to go inside and attempt to
clean them.

Any help would be appreciated. Many thanks,

Tim, KQ8M

Tim -

Regarding your older TS-830 -- no reason not to have this in good shape.
Maybe you have not read K4EAA's web site:

About Kenwood Hybrids
http://www.k4eaa.com/about.html

Kenwood Hybrids - FAQ
http://www.k4eaa.com/faq.htm