****************** TS-440S Digital Audio Modification ******************

NOTICE:
   Please  be  very careful with your transcievers,  and  we  accept  no 
responsiablity   for  any  damage  that  may  be  incurred,   and   this 
modification  may,   and proably would be cause for any  WARENTY  to  be 
DISCONTINUED.


   This Modification allows for the Kenwood TS-440s transceiver to  have 
the data audio on PIN 11 of the 13 pin DIN connector ACC JACK 2.   Later 
models may or maynot have a correction for this,  but my PK-232, or  for 
that fact NONE of my TNC's would  drive the audio to the PIN 11 of   ACC 
JACK 2. Encountering this problem,  and having another H.F.  transceiver 
I have been using the REMOTE connector, and using an audio input to  the 
AFSK IN RCA type connector.  This would allow me to use the same   cable 
with my TS-180s also.  Anyway this modification moves the  wire's   from 
the AFSK IN to the ACC 2 connector.  This should only take about 20   to 
30 minutes to preform this change, and most of the time is used up  with 
the removal,  and  replacement of the THREE covers of the   transceivers 
cabinet.

    The circuit boards to work with,  are called:
DISPLAY UNIT (X54-1870-00) (C/4)   This has the ACC 2 JACK.
SWITCH  UNIT (X41-1610-00) (M/14)  This has the AFSK INPUT.

    The eaiest way is to remove these two boards 4 screws hold the ACC 2 
JACK, and 2 screws hold the AFSK INPUT board in and they are located  at 
the  rear  of the transceiver. If you are interested  in  following  the 
SCEHMATIC  in your manual,  the leads you will be working with are  ANI, 
and  GROUND which is the  PURPLE  LEADS,  and the FSI lead and   GROUND, 
which are the GREEN leads.

     The  problem is that when kenwood designed this rig,  they  brought 
the DATA INPUT(ANI) from the ACC2 JACK to connector J25 of the IF  UNIT. 
This  coming in after the Processor,  and Microphone Amplifier does  not 
allow sufficent amplification of the signal, thus very low, or no  audio 
at  all. What this modification does is swap at the rear of the RIG  the 
FSI,   and ANI signals,  Which also could be done on the IF UNIT  board, 
and  for some may actually be eaiser.  In my case the leads were just  a 
bit  too short to allow this modification to be accomplished on  the  IF 
UNIT.

****************************  MODIFICATION  ****************************


Step 1.
        Be shure to have on a work bench,  and NO POWER APPLIED!

Step 2.
        Remove the TWO BOTTOM covers,  One MAIN cover,  and the smaller
        cover to the REAR of the transceiver.

Step 3.
        Remove the TOP cover.

Step 4.
        Remove the FOUR screws holding the AUTOMATIC ANTENNA TUNER.

Step 5.
        Place the transceiver on it's side with the BOTTOM towards
        you,  and the FRONT to your LEFT.

Step 6.
        Being very careful,  remove the antenna tuner and allow it to
        hang.

Step 7.
        Remove the TWO SCREWS that HOLD the AFSK INPUT board.

Step 8.
        Remove the FOUR SCREWS that HOLD the ACC 2 JACK board.

Step 9.
        Carefully from the inside of the transceiver,  pull these TWO
        boards out.

Step 10.
        Near the Bottom edge of the ACC 2 JACK board,  is a TWO lead
        connettor,  unplug this.  The leads should be PURPLE.

Step 11.
        On the AFSK INPUT board,  there is a 6 PIN connector,  unplug
        this.  The leads you will be working with are GREEN in color.

Step 12.
        Note how the PURPLE leads are connected to the connector itself,
        and remove these two leads by inserting a very small screwdriver
        into the slot on side, and being very gental, push the leads out
        one at a time.

Step 13.
        Now remove the GREEN leads the same manor.

Step 14.
        Insert the GREEN leads into the 2 PIN connector,  the BLACK lead
        is the GROUND, and the WHITE or perhaps YELLOW is the AUDIO lead.

Step 15.
        Insert the PURPLE leads into the 6 PIN connector,  noting that
        the smaller lead is the AUDIO lead,  and it connects to PIN 2,
        the other lead,  being BLACK goes into PIN 1.

Step 16.
        Now reassemble in reverse order the BOARDS,  and start at STEP
        11,  and work in reverse to STEP 1.



 This Modification has been provided by The 834 Group.

 Ben Miller  ARS WB8LGH
 2910 Admiral Street
 Fort Pierce,  Florida  34982

 This file was downloaded via the N4LDG Packet Radio BBS.
 If you have any comments for Ben, direct them to the Sysop of the
 Right Connections BBS: 382-6687. Your comments will be relayed via
 Packet Radio to WB8LGH, or send them directly to WB8LGH @WB8LGH.

 73's