UM581127000 User Instructions
Issue AB, March 22, 2012 Spec. No. 581127000 (Model 710NPBA)
Page 30 Chapter 4. Troubleshooting and Repair
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Circuit Card Replacement Procedures Warning: Circuit cards used in this power system contain static-sensitive devices.
Read the Static Warning at the front of this document before performing
any of the following procedures.
General
The following circuit card replacement procedures can be performed with the system
operating.
Refer to Figure 2-1 for circuit card locations.
Caution: When performing any step in these procedures that requires removal or
installation of hardware, use caution to ensure no hardware is dropped
and left inside the cabinet; otherwise service interruption or equipment
damage may occur.
Note: When performing any step in these procedures that requires removal of existing
hardware, retain all hardware for use in subsequent steps.
System Interface Circuit Card Replacement
Procedure
1) Performing this procedure m ay activate external alarms. Do one of the following.
If possible, disable these alarms. If these alarms cannot be easily disabled,
notify the appropriate personnel to disregard any future alarms associated with
this system while the procedure is being performed.
Danger: Performing the next steps exposes service personnel to battery
potential. Exercise extreme caution not to inadvertently contact or
have any tool inadvertently contact any energized electrical
termination.
2) Open the distribution cabinet’s f ront door by turning the latch in the
counterclockwise position.
Warning: Damage to the circuit card may result if the next step is not followed.
3) Connect an approved grounding strap to your wrist. Attach the other end to a
suitable ground.
4) Remove the top and front panels to access the circuit cards at the bottom of the
distribution cabinet.
5) Carefully label any wires connected to the cus tomer connection terminal block on
the circuit card. These wires must be connected to the same terminals on the
replacement circuit card. Refer to Figure 4-9.
6) Carefully label the connectors plugged i nto the circuit card. These connectors
must be plugged into the same connectors on the replacement circuit card.
Refer to Figure 4-9.
Danger: In the next step, external wiring may be energized from an external
source. DO NOT allow bare wire ends to contact any grounded or
energized object.
7) Remove the external wiring f rom the customer connection terminal block. DO
NOT allow the bare wire end to contact any grounded or energized object.
Isolate the wire end with electrical tape. Repeat for each wire to be removed.
8) Unplug all connectors plugged into the circuit card.