User's Manual
14221-1200-4010, Rev. B
76
16. INITIAL POWER-UP TEST
1. At the main inline fuse holders located near the vehicle battery (or DC power access point); install the
15-amp fuse into the MRU main power fuse holder.
The proper fuse is included with the MRU’s DC Power Cable (installed per Section 9.2.1.2).
2. Install a 30-amp AGC fuse into the fuse holder for LBPA main power.
The fuse is included with the LBPA’s DC Power Cable (installed per Section 9.2.1.2).
3. Install a 5-amp AGC fuse into the fuse holder for the control head’s main power (red wire), if not
previously installed. The fuse is included with the Control Unit’s DC Power Cable.
4. Install a 3-amp AGC fuse into the control head’s ignition sense line (white wire), if used. The fuse is
included with the with the Control Unit’s DC Power Cable.
5. Tie and stow all fuse holders and wiring to prevent excess vibration/movement.
6. Carefully reconnect the vehicle’s battery ground cable.
7. Temporarily connect the multi-band mobile antenna cable from the vehicle-mounted antenna to the
MRU female TNC RF connector “MB ANT.”
This is a temporary connection until test procedures in Section 17 are complete.
8. Temporarily connect the VHF mobile antenna cable from the vehicle-mounted antenna to the MRU
female BNC RF connector “LB ANT.”
This is a temporary connection until test procedures in Section 17 are complete.
9. If the MRU is equipped with the GPS receiver option, permanently connect the antenna cable from
the GPS antenna (or mobile/GPS combo antenna) to the female SMA connector on the rear panel of
the radio.
The male SMA connector on most GPS antenna cables has a 5/16-inch hex collar, so the use of a
wrench of this same size is normally required for tightening. However, some may have collars with
only knurled surfaces, so a standard wrench or torque wrench cannot be used. In either case, do not
over tighten the connector and do not twist the cable when tightening.
10. If the installation is wired so the vehicle’s ignition key/switch turns the radio on and off, turn the
switch to the Accessory or Run position.
11. Rotate the control head on/off/volume control clockwise out of the detent position to apply power to
the radio.
12. Verify the control head has powered-up by observing its display. If the display is not lit, refer to
Section 9.1 as necessary.
As long as the software configuration parameters have been loaded, successful installation is almost
immediately realized:
After a short boot-up sequence, the control head displays login information and/or a talk group.
If no errors are displayed, the installation is most-likely properly wired.