[Boatanchors] [Kenwood] Kenwood TS-530SP

[howard holden]

Problem mostly solved! Many thanks to all who offered suggestions! Wally G was right, it was a "duh" moment indeed, the switch on the rear panel (the screen grid on-off switch) that was the culprit. I think the manual says something about that too. Gotta go back and re-read that. Still no ALC nor drive on 1.8, 18, and 24Mhz but that's most likely a cleaning issue or as Steve said the coupler has slipped. Gonna also work on Steve's suggestions on resistor replacements. By the way, for Rob, the bleeders on the HV caps are 470K in series, so I would definitely expect a slow drop in the plate voltage. All very much appreciated! We are NEVER too old to learn a thing or two.

Thanks and 73, Howie WB2AWQ

________________________________________
From: boatanchors-bounces at mailman.qth.net <boatanchors-bounces at mailman.qth.net> on behalf of KA2PTE <ka2pte at 3950.net>
Sent: Monday, September 16, 2024 9:18 AM
To: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] [Kenwood] Kenwood TS-530SP

Welcome Howard

Im working on a plain 530 now, I replaced the 56K's , all the 470K's....
the 680K's are I think droppers to the panel meter for the voltage mode,
they are usually ok as is the 12/15K and the 1K so I left those alone.

The tube socket solder usually is cracked somewhat, good idea to add solder
to them,
reflow and you will probably note the philips screws on that board are
somewhat loose.
They squish down solder grounds, and over time they loosen and you can
develop poor grounds
on the board. I tighten them and place lock washers on them.

Also while there, measure with an om-meter the cathode resistors from ground
to where pins 1-4-6
tie together in the center with the foil. Should read 5 ohms.

If any higher than that, replace all the 20 ohm cathode resistors. The one I
am doing
reads 7 ohms and I had noticed it was tending to draw more than usual plate
current
when dipping. So I will be replacing them.

--
Steve Hearns [ KA2PTE ]



----- Original Message -----
From: "howard holden" <holden7471 at msn.com>
To: <boatanchors at mailman.qth.net>; "KA2PTE" <ka2pte at 3950.net>
Sent: Monday, September 16, 2024 12:01 PM
Subject: Re: [Boatanchors] [Kenwood] Kenwood TS-530SP


Thanks again Steve! I've been "bitten" many times over my 63 years at this
game. Keeping a record of what you write. I'll get to this stuff later today
maybe.


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