Kenwood TS-440S (TS 440 S TS440S) mods reviews software and diagrams

   
 
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14 November 2019, 18:45 UTC 


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Kenwood TS-440S (TS 440 S TS440S)
TS-440S
Programming interface schematics for Kenwood :
Programming software for Kenwood TS-440S (TS 440 S TS440S) :
PDF User Manual for Kenwood TS-440S (TS 440 S TS440S) :
PDF Service Manual/schematics for Kenwood TS-440S (TS 440 S TS440S) :

Mods for Kenwood TS-440S (TS 440 S TS440S) :
   Kenwood TS-440S (TS 440 S TS440S) IF-10 (RS-232) interface
   Kenwood TS-440S (TS 440 S TS440S) Displays dots on certain bands
   Kenwood TS-440S (TS 440 S TS440S) Circuit Improvements
   Kenwood TS-440S (TS 440 S TS440S) mod for improved receive sensitivity of 0.5 to 1.6MHz
   Kenwood TS-440S (TS 440 S TS440S) PLL unlock due to VCO #5
   Kenwood TS-440S (TS 440 S TS440S) PLL unlock due to VCO #1
   Kenwood TS-440S (TS 440 S TS440S) Intermittent operation
   Kenwood TS-440S (TS 440 S TS440S) SSB Power-adjustment
   Kenwood TS-440S (TS 440 S TS440S) Digital Audio Modification
   Kenwood TS-440S (TS 440 S TS440S) Fan Temperature Modification
   Kenwood TS-440S (TS 440 S TS440S) Possible cure for TS440 showing dots only on display
   Kenwood TS-440S (TS 440 S TS440S) Undocumented feature
   Kenwood TS-440S (TS 440 S TS440S) Serial interface
   Kenwood TS-440S (TS 440 S TS440S) A few adjustments you should know
   Kenwood TS-440S (TS 440 S TS440S) modification to use antenna tuner
   Kenwood TS-440S (TS 440 S TS440S) display calibration
   Kenwood TS-440S (TS 440 S TS440S) Connection to a DATA
   Kenwood TS-440S (TS 440 S TS440S) Computer Interface Instruction
   Kenwood TS-440S (TS 440 S TS440S) increase the power by ALC control
   Kenwood TS-440S (TS 440 S TS440S) with PIN-Diods
   Kenwood TS-440S (TS 440 S TS440S) Operation with the MC-85
   Kenwood TS-440S (TS 440 S TS440S) Notch filter low frequency improvements
   Kenwood TS-440S (TS 440 S TS440S) Protecting Q33
   Kenwood TS-440S (TS 440 S TS440S) Case Screws binding in the heat sink
   Kenwood TS-440S (TS 440 S TS440S) RX Audio Mods
   Kenwood TS-440S (TS 440 S TS440S) Bandscope-Schaltung
   Kenwood TS-440S (TS 440 S TS440S) Modifications in FM mode

Kenwood TS-440S (TS 440 S TS440S) technical specifications :  Kenwood TS-440S (TS 440 S TS440S) technical specifications



Kenwood TS-440S (TS 440 S TS440S) Intermittent operation

When intermittent problems such as erratic display, loss of front panel control, or frequency lock-up are encountered, the PLL and Control circuits must be checked to determine which circuit is malfunctioning. While any number of components may cause such problems, if the Control circuit is suspect, there is a possibility that the ROM socket is at fault. The socket should be tested to determine if it is making good electrical contact with each pin on the ROM. If it is found to be defective, remove the socket and solder the ROM directly to the board. The ROM is IC52 on Control unit (B/2). It should be noted that units with serial number of 909xxxx and above do not incorporate a socket.

Caution

Removing the socket requires good soldering skills. The ROM is mounted on the Digital A unit and is designated as IC2. The board, being double sided, has solder connections on both component and foil sides. When the socket is removed, it is very important to insure that each pin is completely solder free. Having to pry up on the socket means that it is not completely desoldered and will cause the circuit foils to tear.

When performing any work on the Control boards, CMOS handling techniques must be observed. Such techniques include using a grounded or isolated soldering tip, avoid touching the pins of IC chips with your fingers, and ground yourself with a wrist ground strap.

To remove the socket:

  1. Disconnect the power supply and antenna.

  2. Remove both the top and bottom covers from the transceiver. Disconnect the speaker cable from the transceiver.

  3. Remove 2 countersunk screws from each side of the front panel chassis and gently pull the front panel forward.

  4. Loosen the 5 round head screws (2 on top and 3 on the bottom) that secure the shield plate inside the front panel and then remove the plate.

  5. Set the transceiver on its left side and fold the front panel back to expose Control board (B/2). Do not stress the cables.

  6. While avoiding contact with the pins, remove the ROM (IC52) and set it aside on anti-static foam.

  7. Unplug connectors 56 - 58 from Control board (B/2).

  8. Remove 3 brass screws from Control board (B/2). Do not remove the fourth screw that connects to the angle bracket. Instead, remove the brass screw from the Control board (A/2) so the angle bracket stays with the top board.

  9. Fold the top board towards the body of the transceiver. Be very careful not to stress the flat ribbon cables that are soldered between the two boards.

Note

If the foil side of the board id not sufficiently exposed for desoldering purposes, remove the 3 hex bosses from the bottom Control board. Pull both boards forward and open them like a book to allow the best access to the foil side of Control board (B/2).
  1. Carefully desolder the socket and remove it from the board. Do not pry up on the socket. If it does not easily pull off the board, the top foils are still soldered to the socket.

  2. Install the ROM in the board and solder it in place.

  3. Assemble the transceiver by reversing steps 1 - 9. If the bottom board was removed, do not pinch the wire harness under the board during installation. If the harness produces excessive stress on the board, solder connections may become intermittent.

This modification may be covered under warranty during the warranty period.
Time required for this modification is 1.5 hour or less.


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