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Kenwood TS-440S keypad bounce fix with pics.

romakdaddy

Member
Jul 2, 2009
51
2
18
52
KENWOOD TS-440S

i searched the net and all i could find was a explanation on how to fix it with no pics or anything.
I just repaired my key bounce problem with great success and id like to share my experiance.
here goes my first tut:
step one:
unhook anything connected to the unit(mic,power ect)
step two:
remove the tuner knob with a small allen wrench,pull all the other knobs noting where they came from.
IMAG0149.jpg

step three:
remove the 4 black screws from each side and the 2 silver screws from under the tuning knob.
IMAG0151.jpg

IMAG0150.jpg

step four:
remove the faceplate and set aside
IMAG0153.jpg

step five:
remove the 4 silver screws holding the keypad to the front of the unit and unplug the 3 connectors being careful not to break the wires(one of mine broke and i had to repair it)
IMAG0156.jpg

IMAG0154.jpg

IMAG0157.jpg

IMAG0159.jpg

step six:
remove the small gold screws from the back of the keypad being careful not to invert it and lose where all the buttons go.
IMAG0158.jpg

step seven:
pull the circiut board away from the housing and lay it face up on your work surface,there are 2 layers of mylar on the board one on the board has cutouts for the clickers(small metal contacts) and the other goes on top of everything else
note: mine has already been repaired once but the glue they used broke down and fouled up the contacts resulting in the bouncing problem.
IMAG0161.jpg

now for the tricky part,claening it up and reassembly:
peel the top layer of mylar off being careful not to lose the clickers(they have the ability to travel between dimentions when not in your direct line of site)
put the clickers in a safe place for cleaning later.
IMAG0162.jpg

i had to clean all the glue from the mylar due to it being in a semi liquid state.
the white stuff is the glue
IMAG0163.jpg

IMAG0164.jpg

IMAG0165.jpg


other tuts say use alcohol but it wouldnt touch the glue so i took a chance and used non chlorinated brake cleaner(had it on hand) acitone would have worked too.the brake cleaner didnt hurt the mylar but did a number on the glue plus it cleaned the contacts on the board real good too.i used a bunch of qtips and sprayed the brake cleaner in a cap so i could dip the qtip in it.
nice and clean
IMAG0169.jpg

IMAG0170.jpg

IMAG0171.jpg

now is time to clean the clickers.i layed out a shop rag on a hard surface,layed them down one at a time with the contact side up,held them down with a straight pick and wiped them down good with a saturated qtip(remember to be carefup because they also will defy gravity and fly to the other dimention mentioned previously)
once thats done you can place the clickers back in the cutouts on the board(it makes lining them up a snap)
i used 3m spray adhesive and put a light coat on the back side of the top layer of mylar to stick them back in place and they are holding fine.you shouldnt use silicone based adhesive because it will break down and you will be back where you started.
reassembled cleaned and ready to put back in
IMAG0172.jpg


heres some shots of the keys in case you make a boo boo and they fall out of the housing
IMAG0147.jpg

IMAG0148.jpg

IMAG0160.jpg


also other tuts said to remove top cover,bottom cover and the mic connector nut.it was unnessesary
 
Last edited by a moderator:
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wavrider

W9WDX Amateur Radio Club Member
Jun 2, 2009
3,404
1,268
173
Great tut thanks for taking the time to post it, you might also try yahoo user groups for ts-440 lots of info there and the tut would go great with the other info at that site.

I like my ts440 for just general all around band hopping and general rag chew,I have better rigs in the shack but the 440 is a lot of fun to play with.

Enjoy and look forward to working you around the bands.

73's
 

W5LZ

Crotchety Old Bastard
Apr 8, 2005
6,832
823
173
Oklahoma
Did that -once-. I'll never do it again! Forget the sneezing thingy, don't even breath on the @#$ things... :)
- 'Doc
 

prdamrican

New Member
May 30, 2022
1
0
1
60
KENWOOD TS-440S

i searched the net and all i could find was a explanation on how to fix it with no pics or anything.
I just repaired my key bounce problem with great success and id like to share my experiance.
here goes my first tut:
step one:
unhook anything connected to the unit(mic,power ect)
step two:
remove the tuner knob with a small allen wrench,pull all the other knobs noting where they came from.

I know this is an old article... but maybe you could repost it... I jus picked up one of these units and it works great except for the keypad bounce... so I am going to fix it, but I always appreciate those that have gone before me....thanks either way... Aaron W1ATB
 

BJ radionut

Supporting Member and 6m addict
May 9, 2008
4,129
4,665
373
35 miles East of Indianapolis


Sorry Aaron these pictures are lost. This is due to several software and server changes over the last 10+ years the forum has went through. These same pics were used in a couple sites, and of course those links are dead also.
The basics amount to disassembly of the entire faceplate. Then clean and replace if required the bad pushbuttons. Tedious work.


Some pics here to show just how much they must disassemble the face plate!!!
GL
All the Best
Gary/W9FNB

 
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