Service Manual

GSM-204-523
Replacing the control and alarm board (CAB)
31st Oct 01
Maintenance Information: Horizon macro outdoor
68P02902W04-A
CONTROLLED INTRODUCTION
Maint. 3–15
Replacing the control and alarm board (CAB)
Introduction
to CAB
replacement
This procedure describes how to remove and replace a CAB in the
Horizon
macro outdoor cabinet PSU.
The CAB is located in the PSU cage in the power supply enclosure half of the
cabinet, to the left of the number 2 ac power distribution box.
WARNING
Potentially lethal voltages, up to 415 V ac, and other high
energy sources are present within the cabinet when the ac
supply disconnect switch is set to the ON position and/or
batteries are connected.
Replacing a CAB does not require the removal of power. The CAB can be hot
swapped without harm to the module or affecting normal service operation.
Notify the OMC-R of imminent repair activity.
View of CAB
Figure 3-7 shows a typical CAB. The front panel and circuit board layout may
vary slightly, depending on the manufacturer.
DIP SWITCHES
SW2 AND SW4
(see Note below)
Figure 3-7 Control and alarm board (CAB)