Service Manual

GSM-205-523
Replacing a CCB
31st Oct 01
Maint. 2–30
Maintenance Information: Horizon macro indoor
CONTROLLED INTRODUCTION
68P02902W09-B
Removing
CCBs and CCB
control boards
WARNING Before disconnecting RF cables, ensure that the RF
power is OFF by turning cabinet PSMs off. If RF power is
ON when cables are disconnected, severe burns may
result.
The removal off CCBs is accomplished in two stages:
 Removing the CCB basket from the stacking bracket.
 Separating CCBs from CCB basket.
Removing the CCB basket from the stacking bracket
To remove the CCB basket:
1. Close cabinet down by turning off PSMs.
2. Remove the stacking bracket front cover by applying gentle pressure to
the outer edges, while easing the cover up and pulling it away from the
bracket.
3. Disconnect power cable from each CCB and from single connector
(marked CCB) on Interface panel.
CAUTION
Do not detach CCB basket bar unless basket is to be
immediately removed.
4. Loosen the three captive screws attaching CCB basket bar to basket and
the two captive screws securing CCB basket bar to the sides of the
stacking bracket. Remove the bar
5. Disconnect the six N-type to N-type RF cables from the CCB inputs, and
leave draped over the front of the cabinet. Note the locations for correct
replacement.
6. Slide basket part way out of the stacking bracket, and disconnect
antennas to CCBs.
7. Remove the CCB basket, complete with CCBs, from stacking bracket.
Separating CCBs from the CCB basket
To separate CCBs from CCB basket:
1. Place the CCB basket, complete with CCBs, onto a flat surface.
2. Disconnect and remove the phasing lead between CCB control boards.
3. Remove the four M4 screws securing each control board cover, and
remove the CCB control boards.
4. Remove the six screws securing each CCB to the basket, (four M6 screws
on the front and two M8 screws at the back).
5. Remove the CCBs from the basket
The CCBs have now been removed, ready for replacement CCBs.