Lcd Display Module; Relay Pca; Valve Driver Pca; Table 9-10: Relay Pca Control Devices - Teledyne T700 Operation Manual

Teledyne API – Model T700 Dynamic Dilution Calibrator

9.4.6. LCD DISPLAY MODULE

9.4.7. RELAY PCA

9.4.8. VALVE DRIVER PCA

06873B DCN6388
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 and other indications of its state as the CPU goes through its initialization
process.
The Relay PCA can be most easily checked by observing the condition of the status
LEDs on the Relay PCA (see Section 9.3.2), and using the SIGNAL I/O submenu under
the DIAG menu (see Section 4.10) to toggle each LED ON or OFF.
If D1 on the Relay PCA 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 PCA is bad. Several of the control devices
are in sockets and can be easily replaced. Table 9-10 lists the control device associated
with a particular function.

Table 9-10: Relay PCA Control Devices

FUNCTION
UV Lamp Heater
O Gen Heater
3
All Valves
Like the Relay PCA the valve driver PCA is checked by observing the condition of the
its status LEDs on the Relay Board (see Section 9.3.2), and using the SIGNAL I/O
submenu under the DIAG menu (see Section 9.1.3) to toggle each LED ON or OFF.
If D2 on the valve driver board is flashing and the status indicator for the output in
question (Gas Cyl 1, Purge Valve, etc.) toggles properly using the Signal I/O function,
then the control IC is bad.
CONTROL
IN SOCKET
DEVICE
Q2 No
Q3 No
U5 Yes
Troubleshooting and Service
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