Teledyne API T703/T703U Calibrator Operation Manual General Troubleshooting & Service
165
I
2
C BUS 8.4.4.
Operation of the I
2
C bus can be verified by observing the behavior of D1 on the
relay PCA & D2 on the Valve Driver PCA. Assuming that the DC power supplies
are operating properly, the I
2
C bus is operating properly if D1 on the relay PCA
and D2 of the Valve Driver PCA are flashing
There is a problem with the I
2
C bus if both D1 on the relay PCA and D2 of the
Valve Driver PCA are ON/OFF constantly.
TOUCHSCREEN INTERFACE 8.4.5.
Verify the functioning of the touch screen by observing the display when pressing
a touch-screen control button. Assuming that there are no wiring problems and
that the DC power supplies are operating properly, but pressing a control button
on the touch screen does not change the display, any of the following may be the
problem:
The touch-screen 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. If the instrument responds to remote commands and the
display changes accordingly, the touch-screen interface may be faulty.
LCD DISPLAY MODULE 8.4.6.
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.
RELAY PCA 8.4.7.
The Relay PCA can be most easily checked by observing the condition of the
status LEDs located along its upper edge (see Section 8.3.2 and Figure 8-3:
Relay PCA Status LEDs Used for Troubleshooting), and using the
SIGNAL I/O submenu under the DIAG menu (see Section 8.1.3) to toggle each
LED ON or OFF.
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