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1. Turn off the AC power. It is not necessary to disconnect the batteries.
WARNING!
This is a high voltage circuit area. An electrical shock hazard exists in this area when the unit is
operating. Do not remove the fuse while powering the unit. Remove AC power at the source before attempting to
remove the fuse of the power supply.
2. Locate the housing containing the fuse.
3. Remove the upper-half of the fuse housing with long nose pliers.
4. Remove the fuse from the upper-half of the fuse housing.
Installing the Replacement Power Supply Fuse
WARNING!
This is a high voltage circuit area. An electrical shock hazard exists in this area when the unit is
operating. Do not replace the fuse while powering the unit. Remove AC power at the source before attempting to
replace the fuse of the power supply.
1. Insert and center the replacement fuse in the upper housing. Use only a UL listed 250V, 3A, slow blow,
5x20mm fuse.
2. Press the upper housing on the lower housing until the halves snap together. The following figure illus-
trates the closed fuse housing:
3. Restore AC power.
4. Monitor the AC NORMAL and DC OUT ON LED indicators on the power supply to determine that trouble
conditions are not reported following fuse replacement.
Troubleshooting
If the configuration is corrupted on power up/reset, the configuration ROM items can be reset to their default
values by performing the following procedure:
VES Fire Detection Systems
XT+ Releasing Control Unit Installation Manual
Version 1.00 | December 2018 | MAN-1252VES
Page 46
Appendix B: Maintenance and Repair