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9131
Rev. M
4.2 CORRECTIVE MAINTENANCE CONT'D
WARNING
VOLTAGES IN EXCESS OF 1000 VOLTS ARE PRESENT WHEN THE
REGULATOR IS OPERATING. DO NOT ATTEMPT REPAIR OR
SERVICING WITHOUT FIRST REMOVING POWER FROM THE
REGULATOR. THE USE OF LOCK-OUT DEVICES IS RECOMMENDED
FOR INSTALLATIONS WHERE THE POWER DISTRIBUTION PANEL IS
NOT READILY VISIBLE FROM THE REGULATOR OR CSC LOCATION.
Caution should be exercised if removal of Circuit Card Assembly becomes necessary
as the board is easily damaged by improper removal and handling, either of which
would void the warranty. Particular areas of concern are:
(A) Power must be removed from the CSC before attempting to
disconnect or re-connect the connector plugs from the board.
(B) The circuit card is held in place by five screws and by washer and nuts
on switch actuators. All screws, nuts and washers must be replaced
after the circuit card has been re-installed and before plugs are re-
connected to the board. Failure to do so will probably result in
permanent or intermittent circuit board damage.
4.3 TROUBLESHOOTING CHART
The following Troubleshooting Procedure, Table 4-2, is provided as a guideline to
assist qualified airport maintenance personnel in locating and correcting any
malfunctions when they occur. See Figure 4-1, CSC Schematic, for reference during
troubleshooting.
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