Bosch Appliances LTC, 8500 AC Line Fuse Replacement, Power Supply Fuse Replacement

18.3 AC Line Fuse Replacement

The AC line fuse on Allegiant power supply models is found on the rear of the equipment 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.

! !

Fuse Removal

Fuse

Removal

!

Figure 14: 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.

18.4 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.

18.5 Replacement of Memory Backup Batteries

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 which is frequently changing, including time/date and system crosspoint data
	(i.e., which camera is currently being displayed on which monitor). More vital sys-
	tem data such as camera titles, alarm settings, user information and passwords, etc. is
	stored in non-volatile memory that is not affected by the condition of the batteries or
	the main AC power.
	Remove the front panel of the main CPU bay by loosening the four fasteners. The
	two batteries are mounted on the front edge of the CPU card and are about 25 mm
	(1 in.) in diameter. Insert a small flat blade screwdriver into the slot on one of the

EN 66 Bosch Security Systems December 13, 2005