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Bosch Security Systems, Inc. Instruction Manual F.01U.127.393 | 2.0 | 2009.03
19.3 AC Line Fuse Replacement
The AC line fuse on Allegiant power supply models is found on the rear of the equip-
ment bay near the line cord connector. Power supply models for 220-240 VAC input
version may contain a circuit breaker equipped power switch which can be reset
directly from the front. If the line fuse needs to be replaced in a 120 VAC model
power supply, remove the line cord from the system. Insert a flat blade screwdriver
into the slot located at one end of the connector housing and rotate the screwdriver
until the door to the housing opens. Remove fuse holder from housing as shown in
drawing.
Figure 21: Allegiant power supply AC line fuse
Remove fuse from holder and replace with fuse of same rating for continued protec-
tion. Reinstall fuse holder into connector housing in the same orientation as indi-
cated by the arrow on the door cover. Snap door closed. After replacing fuse, verify
system start-up and operation.
19.4 Power Supply Fuse Replacement
The main power supply is located in the far right side of the equipment bay. Remove
the front panel of the bay by loosening the four fasteners. Locate the fuse to be
replaced by observing the green LED indicators. Note which LED indicators are not
lit, then turn OFF the main power switch located on the power supply. Replace
fuses associated with LEDs which were not lit. Switch on the main power switch
and verify that all LEDs are now lit. Replace front panel.
19.5 Replacement of Memory Backup Batteries
General operational notes
• Low battery conditions are indicated by LED on CPU and on-screen flashing “??
?? ??” of time/date fields.
• Battery status can be check by keyboard operator using Keyboard User Func-
tion 43.
• Batteries are checked by CPU once per day at midnight, upon power up, and
after system reset.
• If batteries are replaced without power off/on (of at least 10 seconds) or reset
of CPU, LED and on-screen indicators will not display normal until next mid-
night is reached.
CAUTION Lithium batteries should be replaced by qualified service personnel only.
The memory backup batteries are located on the main CPU card located next to the
power supply module in the main CPU bay. The batteries provide RAM memory
backup for a period of at least one year. They are only active when main AC power to
the system has been lost. The RAM memory is used to store system operational data
Fuse
Removal
Fuse Removal