ts440s.40

From: KD2EJ@N2EYR
To: ALL@ALLUSA
Subject: TS-440S DISPLAY SOLUTION


 I finally took the time to inspect carefully the problem on the TS-440S
 display problem. The first thing was to check the EPROM socket on the
 display board. I found that the socket was not in good shape.
 The IC was very loose and the socket is of very poor quality. I removed
 the socket from the board with a solder sucker, making sure that none of the
 wires connected to the display board was damaged or pulled out.

You have to remove the 4 screws that hold the board to the front panel, so
that the board is free and can swing open so you can have access to the other
side. After this is accomplished, the rest is easy. Even though Kenwood says
to remove the socket and solder the eprom right to the board. I chose not to
solder the chip to the board. I decided to replace the socket with one bought
at Radio Shack for 0.89 cents. This particular socket has the connections 
right on the surface, so that when you place the Eprom on it, you can see that
good contact is being made on each leg of the chip. The socket is called a
low profile socket.

I soldered the socket to the board and replaced the eprom. I carefully 
placed all the wires were they belonged and replaced the metal cover over
the display board. When everything was back in place I turned the rig on
holding down the (A=B) indicator and did a reset. The freq display showed
14.000 mhz. The display is working fine so far, and all seems to be back
to normal. I would not try this operation unless you have the right tools
to desolder the socket, and a worktable with proper lighting. There are 
lots of wires to worry about. Be careful.. It beats sending it back to 
Kenwood.         Kd2ej ......  Winston .......