TS450S TUNING PROBLEMS

Just what it says -- this is the place for any discussions not related to Buying, Selling and Trading ham gear. The discussion must be related to Ham Radio.
Post Reply
RIMSHOT
Posts: 1
Joined: Fri Mar 07, 2008 2:36 am

TS450S TUNING PROBLEMS

Post by RIMSHOT » Fri Mar 07, 2008 2:53 am

TS450S WILL ONLY TUNE 10 KCS AND THEN REVERTS BACK TO THE ORIGINAL FREQ.IF YOU INTER THE FREQ DIRECTLY FROM THE KEYPAD ,IT WILL WORK PROPERLY AS LONG AS YOU ARE TURNING THE KNOB CLOCKWISE. THE SECOND YOU TURN THE TUNING KNOB COUNTER CLOCKWISE IT REVERTS BACK TO THE PREVIOUS [BAND ] THAT YOU HAD BEEN ON. EVER HEARD OF THIS ,OR ANY IDEAS?

WA9WVX
Posts: 103
Joined: Tue Aug 09, 2005 2:31 am
Location: QRZ Indicates Northern Illinois

Kenwood TS450S Tuning Problem

Post by WA9WVX » Fri Mar 07, 2008 5:40 am

In the newer solid state transceivers, they incorporate an Optical VFO Chopper / Coupler that feeds the Up / Down I.C. circuitry to increase or decrease the uperating frequency and digtal display. Knowing Kenwood's track record on their older transceivers, they have a notorious problem with the printed circuit boards developing "Cold Solder Connections" that essemtially open the circuitry connecting between the components and the plated foils on the PC boards themselves.

If you're capable of reheating the printed circuit board connections, using the Kenwood Service Shop Manual with full schematics and PCB overlays. Then I would suggest using a very small Pencil Tip Temperature Controlled Soldering Iron Station with Kester 60 / 40 Solder, a large magnifying glass to view the board connections with a high intensity light and carefully touch up the component to printed circuit board connections on the Up / Down Counter Board.

**** It's very important while reheating the Solder connections not to allow the solder to flow across other PCB foil connections or plating therefore causing "Solder Shorts" that can damage other components and circuitry.****

If you don't feel comfortable attempting this repair process then find a good reputable service shop to troubleshoot the problem and do the required soldering on the printed circuit board. It's a time comsuming process locating the defective solder connections and do not expect a small charge for the work performmed.

73,

Dan
WA9WVX

wa4cch
Posts: 114
Joined: Fri Apr 25, 2003 2:42 am
Location: YULEE FLORIDA

Re: TS450S TUNING PROBLEMS

Post by wa4cch » Sun Mar 09, 2008 5:20 am

RIMSHOT wrote:TS450S WILL ONLY TUNE 10 KCS AND THEN REVERTS BACK TO THE ORIGINAL FREQ.IF YOU INTER THE FREQ DIRECTLY FROM THE KEYPAD ,IT WILL WORK PROPERLY AS LONG AS YOU ARE TURNING THE KNOB CLOCKWISE. THE SECOND YOU TURN THE TUNING KNOB COUNTER CLOCKWISE IT REVERTS BACK TO THE PREVIOUS [BAND ] THAT YOU HAD BEEN ON. EVER HEARD OF THIS ,OR ANY IDEAS?

:idea: before you start soldering and take the chance of realy screwing up clean the molex plugs adound the vco one at a time pull one off and squrit somecleaner in the plug and push it on and off a coule of time that worked for me the pulg also are a trouble spot if your memorys aren't working right you might try a new mem batt

73 chuck

Post Reply