I 2 C Bus; Touchscreen Interface; Lcd Display Module; Table 9-9: Dc Power Supply Acceptable Levels - Teledyne T700 Operation Manual

Troubleshooting and Service
POWER
VOLTAGE
SUPPLY
ASSY
PS1
PS1
PS1
PS1
PS1
PS2
PS2
9.4.4. I 2
C BUS

9.4.5. TOUCHSCREEN INTERFACE

9.4.6. LCD DISPLAY MODULE

244

Table 9-9: DC Power Supply Acceptable Levels

CHECK RELAY PCA TEST POINTS
FROM TEST POINT
NAME
+5 Dgnd
+15 Agnd
-15 Agnd
Agnd Agnd
Chassis Dgnd
+12 +12V Ret
Dgnd +12V Ret
2
Operation of the I 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
the Valve Driver PCA are flashing
There is a problem with the I
Driver PCA are ON/OFF constantly.
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 analyzer responds to remote commands and the display changes
accordingly, the touch-screen interface may be faulty.
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.
Teledyne API – Model T700 Dynamic Dilution Calibrator
TO TEST POINT
# NAME
1 +5
3 +15
3 -15V
3 Dgnd
1 Chassis
6 +12V
6 Dgnd
2
C bus is operating properly if D1 on the relay PCA and D2 of
2
C bus if both D1 on the relay PCA and D2 of the Valve
MIN V MAX V
#
2 4.8 5.25
4 13.5 16V
5 -14V -16V
1 -0.05 0.05
N/A -0.05 0.05
7 11.75 12.5
1 -0.05 0.05
06873E DCN7106