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 Post subject: Kenwood TS930s schematics
PostPosted: Nov Wed 22, 2017 3:31 am 
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Joined: Jan Mon 28, 2013 9:35 pm
Posts: 810
Location: Santa Rosa, CA
Frustrated again.....
Working on a TS930S with blown driver transistors. Not as familiar
with this radio so ordered the service manual which arrived today.
Schematics for the power supply (which I'd like to upgrade) or
the PA module were not included! Most other schematics appear
to be included but not the ones I need.

Does anyone have acces to these?

Yes, I know there are websites that talk about the areas
I'm working in but want schematics to know what changes
have and could be made. TIA
Steve


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 Post subject: Re: Kenwood TS930s schematics
PostPosted: Nov Wed 22, 2017 3:47 am 
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Joined: Jun Sun 19, 2011 2:31 pm
Posts: 4780
Steve,

I will look through my TS-930s files tomorrow to see what I have. Mine is working but I did buy a "switching" power supply to replace the troublesome stock supply and plan to take that route to avoid further difficulties.

Rodger WQ9E


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 Post subject: Re: Kenwood TS930s schematics
PostPosted: Nov Wed 22, 2017 3:13 pm 
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Joined: Jan Mon 28, 2013 9:35 pm
Posts: 810
Location: Santa Rosa, CA
Thanks Rodger. Considered going the switcher replacement route
but I'm fairly impressed with the receiver and didn't want to take
a chance of degrading its performance. I'd be interested in how a
switcher works in this rig.

As far as I've been able to tell the linear supply fails because of poor cooling.
A DC muffin style 12v fan run at a lower voltage made a big difference.
The supply had interesting symptoms. The dial lights would flicker.
A bit of checking showed the 28v supply was going up and down a few volts
at about a 3 cps rate. The worst part, and the thing that took out the
drivers, was when power was turned off the 28v supply went to 40v!
The 2N5885 pass transistors tested good BUT one had an hfe of 80,
the other was closer to 20. The pass transistors were figthing each
other to share the load. Even in receive mode!

I put in a pair of 2N5886's (80v instead of 60v C-E for -5885's)
but the important thing is I *matched* the hfe of the replacements.
Works fine now.
Steve


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 Post subject: Re: Kenwood TS930s schematics
PostPosted: Nov Wed 22, 2017 3:30 pm 
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Joined: Jun Sun 19, 2011 2:31 pm
Posts: 4780
Steve,

check your PM for info.

Rodger WQ9E


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 Post subject: Re: Kenwood TS930s schematics
PostPosted: Nov Wed 22, 2017 11:25 pm 
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Joined: Nov Sat 07, 2009 11:37 pm
Posts: 1774
Location: Sayreville, NJ 08872
There are two roughly two 17 X 24 inch sheets that should be included loose with the TS-930S service manual. One is the Signal Unit schematic (board layout is in the manual) and the other 17 X 24 inch sheet is the Interconnect schematic which includes final schematic, power supply schematic and a bunch of schematics for all the other boards not included as sheets in the manual and also shows all the interconnect wiring between each of the boards. Also be aware that, depending on your version of the service manual, the serial number of your rig will determine which Signal Unit and Interconnect schematics are correct. In my TS-930S service manual listing, serial number identifiers are included to identify correct manual. There's also a bunch of service addenda/bulletins included.

_________________
Pete, WA2CWA - "A cluttered desk is a sign of genius"
http://www.classicradiomanuals.com


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 Post subject: Re: Kenwood TS930s schematics
PostPosted: Nov Thu 23, 2017 3:20 pm 
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Joined: Jan Mon 28, 2013 9:35 pm
Posts: 810
Location: Santa Rosa, CA
Thanks for the tip Pete. The interconnect, power supply and
PA schematics were not included for some reason. The huge
'signal board' schematic was, loose in the back.

I'm aware of the s/n breaks.
Steve


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 Post subject: Re: Kenwood TS930s schematics
PostPosted: Nov Fri 24, 2017 8:16 pm 
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Joined: Feb Tue 07, 2012 9:32 pm
Posts: 1788
Location: Middlesex,NJ
HI STEVE:

HERE IS A PDF OF THE 92 PAGES.THERE ARE SEVERAL OTHERS BUT THEY HAE A LOT FEWER PAGES.

http://www.kg3m.com/sitebuildercontent/ ... manual.pdf

AT THE END ARE SEVERAL SERVICE BULLETINS/

WALTER-W2WIQ


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 Post subject: Re: Kenwood TS930s schematics
PostPosted: Nov Fri 24, 2017 8:56 pm 
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Joined: Nov Sat 07, 2009 11:37 pm
Posts: 1774
Location: Sayreville, NJ 08872
W2WIQ wrote:
HI STEVE:

HERE IS A PDF OF THE 92 PAGES.THERE ARE SEVERAL OTHERS BUT THEY HAE A LOT FEWER PAGES.

http://www.kg3m.com/sitebuildercontent/ ... manual.pdf

AT THE END ARE SEVERAL SERVICE BULLETINS/

WALTER-W2WIQ

The INTERCONNECT and SIGNAL UNIT Schematics (the loose LARGE sheets I mentioned in my post) are missing from this PDF.

_________________
Pete, WA2CWA - "A cluttered desk is a sign of genius"
http://www.classicradiomanuals.com


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