Service Manual

GSM-204-523
Replacing a CTU
31st Oct 01
Maint. 3–30
Maintenance Information: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W04-A
Fitting a replacement CTU
To fit a replacement CTU:
1. Ensure that the correct CTU push-on/push-off circuit breaker button on the
CBM has been pressed to the out (off) position.
2. Ensure that the transmit RF power of the correct CTU has been removed
using the shutdown_device command at the OMC-R or from a PC
connected to the MCUF.
3. Insert replacement CTU module, taking care to locate the module on the
guide rails. Press firmly in place.
4. Tighten both module attachment screws to the correct torque (see
Overview of FRU replacement procedures in this chapter), using an M4
Torx driver.
5. Attach the coax cable to the appropriate Tx block or feedthrough plate for
the CTU. Tighten to the correct torque (see Overview of FRU
replacement procedures in this chapter).
NOTE
The Tx cable has a 90° SMA connector at one end, and a
straight SMA connector at the other. The 90° end is
designed for connection to the Tx port of a CTU.
6. Screw the coaxial cable onto the Tx OUT SMA connector at the top of the
CTU front panel. Tighten to the correct torque (see Overview of FRU
replacement procedures in this chapter).
7. Press and release the appropriate CTU circuit breaker button on the CBM.
The RADIO STATUS LED will flash green for about two minutes, and then
remain lit.
CAUTION
If both RADIO STATUS and Tx STATUS LEDs are
flashing, the boot code is downloading into non-volatile
memory for software upgrade. Power should not be
removed, nor the cabinet reset, until downloading has
been completed, as this will corrupt the non-volatile
memory. If the boot code is corrupted, contact the
Motorola Customer Network Resolution Centre, requesting
the boot code restoration procedure and the appropriate
boot code file.
8. Enable the CTU transmit RF power by using the ins_device command
at the OMC-R, or from a PC connected to the MCUF. The Tx STATUS
LED (yellow) will be lit if the CTU is transmitting.
9. Notify the OMC-R of base station availability and log the maintenance
activity.