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

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

9.4.5. TOUCHSCREEN INTERFACE

254
A voltmeter should be used to verify that the DC voltages are correct per the values in
Table 9-9, and an oscilloscope, in AC mode, with band limiting turned on, can be used
to evaluate if the supplies are producing excessive noise (> 100 mV p-p).

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.
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
06873B DCN6388