Date: 16 Sep 89 11:26
Message-ID: <7602@VE3WZL>
From: VE3WZL@VE3WZL
To: ALL@VE3GYQ
Subject: TM-731A RPTR & OUT-OF-BAND MODS
Path:       N8HTG!VE3WZL

Thanks to the efforts of our local technical wizard, Bob VE3GVD, we now have
the secret to making the new Kenwood TM-731A do the same fancy tricks that its
sister rig the TM-721A did.  Here is how it's done:

1) Remove the top and bottom covers, and take out the screws that will allow
   the front panel assembly to swing down.

2) With the rigs front facing you and the top side up, locate R 121 and R 125
   which are both immediately to the left of the lithium battery.

3) Using a low wattage iron and tweezers, remove R 121 which is about the seven
   o'clock position with respect to the battery and reinstall it in the blank
   position designated for R 125 which is about the eight-thirty position with
   respect to the battery.

4) Now locate R 25 on the back of the circuit board that is attached vertically
   to the main chassis. (It's the board behind the front panel when the panel
   is folded up)  Carefully un-solder and lift off the grounded end.

That completes the mod.  Having a service manual, or at least a board layout
will assist you in locating the components.  It will be neccessary to do a
reset on the microprocessor as described in the user manual after doing the
mods described.

For those curious as to what does what, removing R 121 enables the repeater
cross-band function, and the adding of R 125/removal of R 25 enables the out-
of-band features.

73, Weazle, VE3EAR @ VE3WZL.ON.CAN.NA





        TM-731 FREQUENCY AND CROSS BAND REPEATER MODIFICATION
        =====================================================
 
    The TM-731a will transcive between 136-174 MHz and 400-500 MHz as
    well as perform cross band repeter function when the following
    modifications are performed.
 
    1.-  Remove both the  top and bottom cover. Disassemble the front
         panel such that the control unit (X53-3250-XX) is accessable.
 
 
    2.-  Remove R121, R123 and R25. While R125 snd R124 must be present.
 
 
    3.-  If the time-out timer function is not desired, remouve R122 as well.
 
 
    4.-  Reassemble the unit and perform a microprocessor reset before
         operating the set.
 
 
    5.-  Preserve your license by operating whithin the bands it is
         cover for.
 
 
                  BEST 73's
                  GERALD
 

Msg Nr.     : 159617
Da          : EA7FHR
Per         : MODS  @WW      
Tipo/status : BF
Data/ora    : 0303/0615
Dimensione  : 2603
Bid (Mid)   : 21914_EA7FKB
Titolo      : Alcune modifiche per il TM731

        TM-731 FREQUENCY AND CROSS BAND REPEATER MODIFICATION
        =====================================================
 
    The TM-731a will transcive between 136-174 MHz and 400-500 MHz as
    well as perform cross band repeter function when the following
    modifications are performed.
 
    1.-  Remove both the  top and bottom cover. Disassemble the front
         panel such that the control unit (X53-3250-XX) is accessable.
 
 
    2.-  Remove R121, R123 and R25. While R125 snd R124 must be present.
 
 
    3.-  If the time-out timer function is not desired, remouve R122 as well.
 
 
    4.-  Reassemble the unit and perform a microprocessor reset before
         operating the set.
 
 
    5.-  Preserve your license by operating whithin the bands it is
         cover for.
 
 
                  BEST 73's
                  GERALD
 

       73S DE EA7FHR @EA7FKB.EAAL.ESP.EU