I 2 C Bus; Touchscreen Interface; Table 8-7. Dc Power Supply Acceptable Levels - Teledyne T750 User Manual

Table 8-7. DC Power Supply Acceptable Levels

POWER
SUPPLY
VOLTAGE
ASSY
PS1 +5
PS1 +15
PS1 -15
PS1 Agnd
PS1 Chassis
PS2 +12
PS2 Dgnd
I C B
2
US
Operation of the I
distribution board & D2 on the Valve Driver PCA. Assuming that the DC power supplies
are operating properly, the I
board and D2 of the Valve Driver PCA are flashing
There is a problem with the I
the Valve Driver PCA are ON/OFF constantly.
T
OUCHSCREEN
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:
•
•
You can verify this failure by logging on to the instrument using NumaView™ Remote
software or a terminal program. If the instrument responds to remote commands and the
display changes accordingly, the touch-screen interface may be faulty.
142
CHECK POWER DISTRIBUTION BOARD
TEST POINTS
FROM TEST POINT
NAME #
Dgnd 1
Agnd 3
Agnd 3
Agnd 3
Dgnd 1
+12V Ret 6
+12V Ret 6
2
C bus can be verified by observing the behavior of D1 on the power
2
C bus is operating properly if D1 on the power distribution
2
C bus if both D1 on the power distribution board and D2 of
I
NTERFACE
The touch-screen controller may be malfunctioning.
The internal USB bus may be malfunctioning.
MIN V
TO TEST POINT
NAME #
+5 2 4.8
+15 4 13.5
-15V 5 -14V
Dgnd 1 -0.05
Chassis N/A -0.05
+12V 7 11.75
Dgnd 1 -0.05
MAX V
5.25
16V
-16V
0.05
0.05
12.5
0.05
083730750B DCN8606