User's Manual

TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TDFM-136A Operating Instructions Page 2-24
TiL 09RE405
2.5 COMMAND/MAINTENANCE LEVEL 4
The Command/Maintenance Level 4 is available to allow authorized personnel to set policy for
the radio use, by granting or restricting access to system commands and features.
This command level does not preserve the Normal Operating display characteristics, that is: the
Main and Guard displays are replaced by suitable command prompt information.
Accessing the Maintenance Commands
Access to the Level 4 commands is restricted to bench use only, in order to achieve this, the
command level requires that a shunt be placed on a specific set of jumper pins on the MCU board
of the radio. To do so refer to Figures 2-32 and 2-33, and follow these steps:
1. Ensure that the power to the unit is OFF.
2. Remove the left hand side cover (10 Philips screws)
3. Locate the 6-pin jumper field (approximately half way between the front and rear of the
radio).
4. Place a 0.1” shunt on the set of jumper pins closest to the front of the radio.
The user can now select level 4 (maintenance mode).
FIGURE 2-32 Screw positions to remove the Left-hand Side Panel
FIGURE 2-33 Shunt Position to Enable Level 4 Access
NOTE: Jumper access to this command level MUST BE DISABLED when the radio is used in
flight, maintenance mode commands are NOT required for flight operation.