MAINTENANCE
PREVENTIVE MAINTENANCE PROCEDURES
6 - 2
WBPEEUI240754A0
®
PREVENTIVE MAINTENANCE PROCEDURES
This section covers tasks from Table
that require specific
instructions or further explanation.
•
Cleaning printed circuit boards and edge connectors.
•
Checking signal, power and ground connections.
Printed Circuit Board Cleaning
There are several circuit board cleaning procedures in this sec-
tion. These procedures cover circuit board cleaning and wash-
ing, cleaning edge connectors and circuit board laminate
between edge connectors. Use the procedures that meet the
needs of each circuit board. Remove all dust, dirt, oil, corro-
sion or any other contaminant from the circuit board.
Do all cleaning and handling of the printed circuit boards at
static safe work stations. Always observe the steps under
in Section 3 when handling printed cir-
cuit boards.
Table 6-1. Preventive Maintenance Schedule
Task
Frequency
Check cabinet, module mounting unit backplane assem-
bly, digital output module and termination device for dust.
Clean as necessary using an antistatic vacuum. If circuit
board cleaning is necessary, refer to procedure.
Every six
months or dur-
ing plant shut-
down,
whichever
occurs first.
Check all signal, power and ground connections that are
associated with the digital output module. Verify that they
are secure. Refer to procedure.
WARNING
Never clean electrical parts or components with live power
present. Doing so exposes you to an electrical shock hazard.
Wear eye protection whenever working with cleaning solvents.
When removing solvents from printed circuit boards using
compressed air, injury to the eyes could result from splashing
solvent as it is removed from the printed circuit board.
