The RC-10 hang up time and timeout timer (Cross-Band Repeater function) are preset at the factory for three seconds and three minutes respectively. Should it become necessary, the RC-10 can be following procedure will allow the user to select the best setting for his requirements.

Procedure:

1. Disconnect the RC-10 from all other equipment.
   
   
2. Using a thin plastic tool, remove the KENWOOD badge from the handset.
   
   
3. Underneath the badge are two holes in the handset. Remove the machine screw from the left hole.
   
   
4. At the bottom of the handset locate two small holes in the plastic molding (see figure 1). Press a narrow alignment tool into both holes and pry the handset apart (be careful not to break the short wires inside).
   
   
5. Remove the PTT and AF level knobs.
   
   
6. Remove the three 3 x 6 mm machine screws that secure the metal shield to the handset.
   
   
7. Lift the AF unit and shield to expose the Keyboard assembly.
   
   
8. Locate resistors R8 - 11 on the Keyboard assembly (figure 2).
   
   
9. Connect the left side of the resistor to the ground side (right side) of capacitors C8 - 11. Use the timing chart and figure 2 for timing configurations.
   
   
10. Reassemble the handset. Route all wires under the cut outs on the shield. Do not pinch any wires.

+------------------------------------------------------------------+
|               HANG UP TIME                        TIMEOUT TIMER  |
+------------------------------------------------------------------+
|                R10     R11                           R8      R9  |
|  0    SEC       0       0                 0 SEC       0       0  |
|  0.25 SEC       0       1                30 SEC       0       1  |
|  0.50 SEC       1       0                 1 MIN       1       0  |
|  3    SEC       1       1                 3 MIN       1       1  |
+------------------------------------------------------------------+
|                                    1: Do not connect to ground   |
|                                    0: Connect to ground          |
+------------------------------------------------------------------+

When two transceivers are connected to the RC-10, alternator noise may be induced in the mic circuits. The following modification will correct this condition.

Parts required:

600 ohm isolation transformer            W05-0222-00     qty 2.
470 µH ferri-inductor                    L40-471-05      qty 1.

1. Remove the base plate from the RC-10 (6 screws on the plate; 1 screws on the back panel).
   
   
2. Add the ferri-inductor between pins 7 and 8 of the connector B as shown below.
   
   
3. Locate connectors J2 on the AF unit (X49-3010-XX B/3).
   
   
4. Add a transformer in each mic circuit as shown below.
   
   
5. Using double sided tape, secure each transformer to the side wall on the base.

This modification may be covered under warranty.
Time required for this modification is ½ hour or less.