1. Disconnect the power supply and antenna.
2. Remove the top and bottom covers (12 screws). Disconnect the speaker wire from the transceiver.
3. Locate the green jumper wire show in figure 1. Using a sharp pair of wire cutters, cut the jumper in half.(green jumper)
   

                                   ______
                    ______________ |    |_____
                    |        TOP             <|---- Green Jumper
                    |                         |
                    |                         |
                    |    Heat sink            |
                    |             |           |
                                  |
                                  /
                              figure 1
   

   CAUTION:
   Cutting the green jumper allows the TM-701A to transmit from 142 to 151.995 MHZ. Protect your license by only using frequencies that you are authorized to transmit on.
4. Solder a jumper wire to the foil side of the TX-RX board as shown in figure 2.
   

                ______        ^
              __|    |________|________________
              |         Display side          |
              |             X ......          |          X = Screw
              |             X ......          |
              |                    - ----|    |
              |         ..............   | <----------  ADD Jumper
                            .            |
                  Pin #3    :____________|
                            :
                              figure 2
   

5. Assemble the transceiver by reversing steps 1 -2.
6. Reset the microprocessor by holding in the MR key as the power is turned on.

1. Select the operating frequencies for both bands.
2. Set the squelch control to the threshold point. The TM-701a will transmit in the repeater cross-band mode if the squelch control is set too low or a signal is received.
3. Place the transceiver in the duplex mode (F + DUP).
4. Press the F key for longer than one second. The F indicator will flash.
5. Press the LOW key. The transceiver will now enter the repeater cross-band mode of operation.
6. To cancel the operation and return to the VFO mode, press the VFO key.

Figure 2
                              rear of radio
         ------------------------------------------------------
         !                                                    !
         !                                                    !
         !               o                                    !
         !               o                                    !
         !               o                                    !
         !               o                                    !
         !               o  o                                 !
         !               o  o                                 !
         !               o  o                                 !
         !               o  o                                 !
         !               o  o                                 !
         !  __add__________Xo                                 !
         !  i               o                                 !
         !  i               o                                 !
         !  i                                                 !
         !  i ooooooooooooooooooooooooooooooo                 !
         !  i                                                 !
         !  -------i                                          !
         !         i                                          !
         !         Xo@o                                       !
         !                                                    !
         !         ooooooooooooooo                            !
         !       oooooooooooooooooooo                         !
         _____________________________________________________
         mic plug    (radio bottom)
         (Jumper wire from X to X)

1. remove top bottom covers.
2. remove knobs pulling them straight off of the front panel.
3. Remove plastic faceplate.
4. remove 4 screws on front panel metal spacer and remove panel.
5. remove plastic panel/LCD by pulling straight off of the rig toward front.
6. remove the 3 screws from the Control PCB and pull straight off of the chassis.
7. Diodes mount on the back of the PCB at S205 and S209. The Andoe goes toward the switches and the cathode goes away from the switches.
   D209 goes to S205 (TONE switch)
   D207 goes to S209 (MR switch)
   D208 goes to S204 CAUTION remove D208 only if you want to change the split from +- 5 Mc to +- 1.6 and - y6 Mc (european split).
   replace all parts in reverse order. There is no RF circuit adjustments needed for this mod.

Some TM-231A owners have reported that the transceiver intermittently loses its memory channel information at power on. The following modification will absorb pulses on the CPU interrupt line (INT4) and reconfigure the backup switching circuit to avoid unintentional memory loss.

This modification should be performed on a Dealer level as they have the correct tools to disassemble the transceiver.

Required parts:

220 µF, 6.3 V Electrolytic capacitor        CE04NW0J221M
0.01 µF ceramic capacitor                   CK45B1H103K
0.022 µF ceramic capacitor                  C91-0475-05
2.2 Kohm chip resistor                      RK73FB2A222J
1 Kohm carbon resistor                      RD14BB2C102J
3.0 V Zener diode                           MTZ3.0JB

1. Disconnect the power supply, antenna, and microphone.
   
   
2. Remove the top and bottom covers (12 screws). Disconnect the speaker plug when the top cover is removed
   
   
3. Remove the knobs from the front panel.
   
   
4. Remove the nut from the microphone jack and the 11mm nut from the channel selector switch.
   
   
5. Remove the 4 screws that secure the front panel to the body of the transceiver.
   
   
6. Pull the front panel off the transceiver to expose the Control board.
   
   
7. Remove the 3 screws from the Control board. Gently pull the board off the transceiver.
   
   
8. Perform the changes shown in the accompany diagram. C202 is on the component side of the Control board. All other work will be done on the foil side of the board.

This modification may be covered under warranty.
Time required to perform the modification is 1 hour or less.