Part 2 Isolating and Solving Instrument Problems
184
Troubleshootin
the Instrument
Monitor screen
is blank.
Power not connected or
not switched on. Battery is
not installed, is empty, or
battery fuse is blown.
AC Fuse is blown.
Power supply defective.
System board is defective.
Poor connection to dis-
play.
Display backlight tubes
worn.
Display defective.
Connect to AC power sup-
ply or fit charged battery
and switch on the Moni-
tor.
Check and replace defec-
tive fuse (the Power Sup-
ply contains two fuses).
Check if the AC power
lamp on the front panel is
on or off.
Check System Board
LEDs (see Troubleshoot-
ing the System Board
LEDs).
Check the ribbon-cable
connection from the Sys-
tem Board to the Monitor
Bezel
Replace backlight tubes.
Replace display.
Monitor screen
is blank but the
Instrument
appears to boot
as it should;
alarm LEDs
switch on/off,
successful test
sound, and yel-
low LED on the
System Board
blinks.
Display cable may be
incorrectly seated. The
display cable has two
rows of connectors. It is
possible (although
extremely unlikely) that
the connector has been fit-
ted one row too high.
Refit the display cable
making sure that the two
rows of connectors fit
together correctly. (It is
mechanically not possible
for a left/right misalign-
ment.
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