Maintenance Information - Philips Allegiant LTC 8500 Series Instructions For Use Manual

The Allegiant system has been designed to perform
for long periods of time with little or no
maintenance. Occasionally the need will arise to
clean the keyboard, or replace a fuse. Follow the
instructions below if any of these items are
required.
Cleaning The Keyboard
The keyboard may be cleaned whenever deemed
necessary simply by temporarily removing it from the
system and wiping it with a damp cloth. If a
conventional spray type cleaner is required, spray
the cloth first, then wipe off the surfaces. Do not use
petroleum based cleaners or cleaners containing
benzene, triclorethylene, ammonia or acetone, as
these cleaners could damage the plastic surfaces.
AC Line Voltage Input Selection
The AC line voltage input selector is found on the
rear of the equipment bay inside the line cord
connector housing. The present input voltage
selection will be shown in the window of the
connector housing. Remove AC line cord if the
setting is incorrect. To change the setting, insert a
flat blade screwdriver into the slot located at one end
of the connector housing as indicated in the drawing
and rotate the screwdriver until the door to the
housing opens.
Remove the voltage selector wheel from the connector
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housing and rotate until the desired voltage is visible.
Reinsert the wheel back into the connector housing
so that the selected voltage is facing out. Snap door
closed and verify that the correct voltage selection is
visible through the window. Reattach AC line cord.
AC Line Fuse Replacement
The AC line fuse on TC8805 power supply models is
found on the rear of the equipment bay near the line
cord connector. TC8805X power supply models (220-
240 VAC input version) contain a circuit breaker
equipped power switch which can be reset directly
from the front. If the line fuse needs to be replaced

MAINTENANCE INFORMATION

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Line Voltage
Selector
Removal
in a TC8805 model, 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.
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Remove fuse from holder and replace with fuse of
same rating for continued protection. Reinstall fuse
holder into connector housing in the same orientation
as indicated by the arrow on the door cover. Snap
door closed. After replacing fuse, verify system start-
up and operation.
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.
Replacement of Memory Backup Batteries
CAUTION: LITHIUM BATTERIES SHOULD BE
REPLACED BY
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. 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 the size of
quarters. Insert a small flat blade screwdriver into the
slot on one of the battery holder sockets and gently
pry the battery from the holder until it can be
removed by your fingers. Replace old battery with
new battery by lifting the retaining clip up while
inserting the battery into the socket. Insure that the
negative side of the battery contacts the socket by
seating the battery until it is somewhat flush with the
level of the battery holder. Repeat procedure for
other battery.
Verification of the system's time and date and
sequences should be made to insure no information
was lost. Refer to the appropriate section of the
instruction manual if any reprogramming is required.
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Fuse
Removal
QUALIFIED SERVICE