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Teledyne ML - T100 UV Fluorescence SO2 Analyzer
2
10.6.3. I
C BUS
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
on the relay PCA and D2 of the Valve Driver PCA are flashing
There is a problem with the I
constantly.
10.6.4. TOUCH-SCREEN INTERFACE
The touch-screen controller may be malfunctioning.
The internal USB bus may be malfunctioning.
10.6.5. LCD DISPLAY MODULE
Table 10-5: DC Power Supply Acceptable Levels
POWER
VOLTAGE
FROM TEST POINT
SUPPLY
PS1
+5
PS1
+15
PS1
-15
PS1
AGND
PS1
Chassis
PS2
+12
PS2
DGND
2
C bus if both D1 on the relay PCA and D2 of the Valve Driver PCA are ON/OFF
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 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.
06807A(DCNxxxx)
CHECK RELAY BOARD TEST POINTS
TO TEST POINT
NAME
#
NAME
DGND
1
AGND
3
AGND
3
-15V
AGND
3
DGND
DGND
1
Chassis
+12V Ret
6
+12V
+12V Ret
6
DGND
Troubleshooting & Repair
MIN V
#
+5
2
+4.80
+15
4
+13.5
5
-14.0
1
-0.05
N/A
-0.05
7
+11.8
1
-0.05
2
C bus is operating properly if: D1
MAX V
+5.25
+16.0
-16.0
+0.05
+0.05
+12.5
+0.05
275
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