Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Any way to adjust the "play" in TS440SAT tuning knob?  (Read 3819 times)
WA2ISE
Member

Posts: 170




Ignore
« on: March 02, 2014, 02:22:55 PM »

Not a mechanical "play" but when I'm trying to zero onto a station I may go too far up or down in frequency, and change directions.  But there is a fair amount of "dead" time before the receiver responds to my reversed knob twisting.  Is there an adjustment? (I looked in the manual but found nothing, maybe what I'm looking for I didn't have the right name for?)
Logged
W5LZ
Member

Posts: 477




Ignore
« Reply #1 on: March 04, 2014, 09:25:09 PM »

Inrad used to make a device that slowed the tuning rate down on the TS-440.  Haven't seen one in years, but they were worth their cost!
 - Paul
Logged
VE7DQ
Member

Posts: 177




Ignore
« Reply #2 on: March 07, 2014, 07:51:22 PM »

I just looked in the service manual, and you are correct; there doesn't seem to be an adjustment for the optical tuning encoder (W02-0373-05). 

There could be a mechanical fault whereby the encoder wheel has come loose from the shaft inside the encoder (unlikely).  Is the main tuning knob tight on the encoder shaft?  Does the encoder shaft turn freely without the tuning knob?  They have been known to sieze.

Electrically, the phasing between the two output channels could have drifted.  A two-channel 'scope on the output lines of the encoder will indicate that.   Adjustment would require removal of the encoder.
Logged
K8AC
Member

Posts: 1477




Ignore
« Reply #3 on: March 08, 2014, 04:48:26 AM »

If I were you, I'd ask the question on the Kenwood TS-440 Yahoo group, where there are 2,500 440 owners.  Also, refer to the problem as "backlash" in the tuning.

73, K8AC
Logged
WA2ISE
Member

Posts: 170




Ignore
« Reply #4 on: March 25, 2014, 01:05:08 PM »

...

There could be a mechanical fault whereby the encoder wheel has come loose from the shaft inside the encoder (unlikely).  Is the main tuning knob tight on the encoder shaft?  Does the encoder shaft turn freely without the tuning knob? 

...

That was it.  After removing about 3 layers, got to the tuning module.  After looking for and finding a combination of metric and English nutdrivers and metric allen wrenches,  and removing the LED diode assembly (easier than trying to find the wire connector in the rats nest of wire) was able to walk away from the rig with it.  Took the metal back off the module, and I could see what causes the "play" I complained about.  Seems that a D shaped flat on the tuning shaft didn't have a good grip on the encode metal wheel.  Found that sticking a sliver of plastic cut from a bread tag fixed the play.  And used some nail polish stolen from the womenfolk of the house to glue it in. And a touch more to glue the shaft to the E ring to a washer then to the encoder wheel.  Carefully to avoid gooping the encode slots or the shaft to sleeve interface.  After it dried, put it back together.  No more play.  Smiley  Of course when handling the rig you inadvertently change the state of one or more push button switches, and why don't I hear the RF noise of 15 meters?  Oops, it got set to "send" mode....  Corrected that, and it looks like it survived the open heart surgery.
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!