GE DINAMAP Compact TS Service Manual page 59

UUT Problem
Incorrect or No LCD
output.
No LCD Backlight.
Incorrect or No LED
display output.
SpO Probe
2
disconnected error
reported on LCD
(P00 Error).
SpO No signal error
2
(P55 Error).
Possible Causes
LCD Board fault.
Addressing fault either:-
Switch Board or
Main Board (will usually be
accompanied by an audible
alarm if Main Board Processor
has stopped running).
Negative supply to LCD module,
potted down on the Switch Board
from the -12v supply, out of
spec.
LCD Board fault.
Display Board fault.
Addressing fault either:-
Switch Board.
Main Board.
Note: If a partial loss of the
LED' s is found the fault is most
likely to reside on the LCD
Display Board.
LED Display Board fault.
Addressing fault either:-
Switch Board or
Main Board (will usually be
accompanied by an audible
alarm if Main Board Processor
has stopped running).
No or low +4.5V VDISP supply.
Faulty Finger Probe.
Faulty SpO Module to Front
2
Panel cable.
SpO Module fault.
2
Faulty Finger Probe.
Faulty SpO Module to Front
2
Panel cable.
SpO Module fault.
2
Further Checks
Swap or test LCD Board.
Swap or test Switch Board.
Swap or test Main Board.
Check Negative Supply reaches
LCD Module.
Swap or test LCD Board.
Check Operation of backlight
switch TR1 and confirm
+Vbacklight is present on PL31
Pin 2 w.r.t Pin 1.
Swap or test Switch Board.
Swap or test Main Board.
Swap or test LED Display Board.
Swap or test Switch Board.
Swap or test Main Board.
Swap or test PSU Board.
Check supply continuity from
PSU Board to Display Board.
Test with known good sensor.
Swap or check cable continuity.
Swap module and test unit with
Nellcor SpO Simulator.
2
Test with known good sensor.
Swap or check cable continuity.
Swap module and test unit with
Nellcor SpO Simulator.
2
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