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Troubleshooting and Service Teledyne API T801 NDIR CO2 Analyzer Operation Manual
194
11.6.4. TOUCH SCREEN INTERFACE
Verify the functioning of the touchscreen by observing the display when pressing
a touchscreen control button. Assuming that there are no wiring problems and
that the DC power supplies are operating properly, if pressing a control button on
the display does not change the display, any of the following may be the problem:
The touchscreen controller may be malfunctioning.
The internal USB bus may be malfunctioning.
You can verify this failure by logging on to the instrument using APICOM or a
terminal program to any of the communications ports. If the analyzer responds to
remote commands and the display changes accordingly, the touchscreen interface
may be faulty.
11.6.5. LCD DISPLAY MODULE
Verify the functioning of the front panel display by observing it when power is
applied to the instrument. Assuming that there are no wiring problems and that
the DC power supplies are operating properly, the display screen should light and
show the splash screen with logo and other indications of its state as the CPU
goes through its initialization process.
11.6.6. RELAY BOARD
The relay board PCA (04523) can be most easily checked by observing the
condition of the its status LEDs on the relay board, as described in Section
12.5.3.1, and the associated output when toggled on and
off through signal I/O
function in the diagnostic menu, See Section 11.1.3.
1. If the front panel display responds to key presses and D1 on the relay board
is NOT flashing then either the wiring between the Keyboard and the relay
board is bad, or the relay board is bad.
2. If D1 on the relay board is flashing and the status indicator for the output in
question (heater power etc.) toggles properly using the signal I/O function,
then the associated control device on the relay board is bad. (Several of the
control devices are in sockets and can be easily replaced).
11.6.7. SENSOR ASSEMBLY
The CO
2
sensor has no user-serviceable parts.
07274B DCN6418