Service Manual

GSM-204-523
Replacing a SURF module
31st Oct 01
Maint. 3–32
Maintenance Information: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W04-A
Replacing a
SURF module
Removing a faulty SURF module
To remove a SURF proceed as follows:
NOTE
The procedure for replacing a faulty SURF module is the
same for both single and dual band SURF variants.
1. Note the RF cable connections to the SURF module to enable correct
reconnection to the replacement module.
WARNING
Ensure that RF power is OFF before disconnecting RF
cables. Severe burns may result if RF power is ON when
cables are disconnected.
2. Disable all CTU transmit RF power by using the shutdown_device
command at the OMC-R, or from a PC connected to the MCUF.
NOTE Refer to Technical Description: BSS Command Reference
(GSM-100-321)
for information on usage and specific
device codes.
3. When all CTUs have been shutdown, check that the Tx STATUS LED
(yellow) is extinguished.
4. Press and release the CTU circuit breaker buttons on the CBM to the out
(off) position. Ensure that each RADIO STATUS LED is extinguished.
5. Press and release the SURF circuit breaker button on the CBM to the out
(off) position.
6. Disconnect the coaxial RF cables by carefully unscrewing and pulling
them out of the module sockets. Note the positions for correct
replacement.
7. Using a Torx driver, unscrew the four M6 torx captive screws holding the
SURF module to the top of the cabinet.
8. Using the handles, lift the SURF block from the slot.