Touchscreen Interface; Lcd Display Module; Relay Board; Table 5-9. Relay Board Control Devices - Teledyne T400 User Manual

5.7.9.4

TOUCHSCREEN 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.

5.7.9.5 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.

5.7.9.6 RELAY BOARD

The relay board PCA (P/N 04135) can be most easily checked by observing the condition
of the its status LEDs on the relay board, as described in Section 5.7.4.2, and the
associated output when toggled on and off through signal I/O function in the diagnostic
menu, see Section 5.7.3.
If the front panel display responds to button presses and D1 on the relay board is NOT
•
flashing then either the wiring between the touchscreen and the relay board is bad, or the
relay board is bad.
If D1 on the relay board is flashing and the status indicator for the output in question (heater
•
power, valve drive, 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.
•
The table below lists the control device associated with a particular function:
•
083730400A DCN8130

Table 5-9. Relay Board Control Devices

FUNCTION
UV Lamp Heater
Optional IZS O Gen Heater
3
Optional Metal Wool Scrubber
All Valves
Teledyne API – Model T400 O
CONTROL
IN SOCKET
DEVICE
Q2 No
Q3 No
K1 Yes
U5 Yes
Analyzer
3
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