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Routine Checks and Maintenance
9.5
Corrective Action/Repairs
9.5.1
Software Procedures
9.5.2
Hardware Procedures
Disassembling the
Device
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o
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9-10
A restart of the processor system, as described in Section 9.2, can be done as an at-
tempt to solve a problem. Setting changes can be made to solve simple problems,
such as sporadic alarms from elements of the measured-value-supervision. These at-
tempts of solving problems can be done while the device is in service.
If a processor restart or setting change does not remedy the problem, then no further
action should be done while the device is in service. Instead, replace the device with
a tested spare.
Hardware modifications or repair should be limited in scope to changes that are abso-
lutely necessary. Some examples of hardware repair are changing the small fuse in
the power supply and replacing a printed circuit board or module.
Hardware modifications or repair should only be done by experienced personnel. Do
not insert or extract a printed circuit board unless the device is completely isolated.
Soldering work must not be done on the printed circuit boards.
The device must be disassembled if work is to be done on the printed circuit boards.
The procedure below should be used.
The following equipment is needed:
− Grounded mat for protecting components subject to damage from electrostatic dis-
charges (ESD).
− Screwdriver with a 5 to 6 mm or
− #1 Phillips screwdriver.
− 4.5 mm socket or nut driver.
Open protective switches (test switches, fuses, or circuit breakers) to completely iso-
late the device.
Disconnect all communication cables from the device. Carefully remove optical fibers
from the device. Apply protective caps to the fiber ends and the communication ports
on the device.
These activities do not apply if the device is for surface-mounting.
Unfasten the screw-posts of the D-subminiature connector on the back panel at loca-
tion "A."
This activity does not apply if the device is for surface-mounting.
If the device has more communication interfaces at locations "B" and/or "C" on the
rear, the screws located diagonally to the interfaces must be removed.
This step is not necessary if the device is for surface-mounting.
1
/
inch tip.
4
7SJ63 Manual
C53000-G1140-C120-1
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