I 2 C Bus; Touchscreen Interface; Lcd Display Module; Table 11-6: Dc Power Supply Acceptable Levels - Teledyne T802 Operation Manual

Troubleshooting and Service

Table 11-6: DC Power Supply Acceptable Levels

POWER SUPPLY
ASSY
PS1
PS1
PS1
PS1
PS1
PS2
PS2
2
11.6.3. I C BUS

11.6.4. TOUCHSCREEN INTERFACE

11.6.5. LCD DISPLAY MODULE

210
Teledyne API T802 Paramagnetic O
CHECK RELAY BOARD TEST POINTS
VOLTAGE
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 Board in conjunction with the performance of the front panel display.
Assuming that the DC power supplies are operating properly and the wiring is
2
intact, the I C bus is operating properly if:
 D1 on the relay board is flashing, or;
 D1 is not flashing but pressing a button on the touchscreen results in a change
to the display.
Verify the functioning of the touchscreen by observing the display when pressing
a touchscreen control button. Assuming that there are no wiring problems and
that the DC power supplies are operating properly, if pressing a control button on
the display does not change the display, any of the following may be the problem:
 The touchscreen 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 to any of the communications ports. If the analyzer responds to
remote commands and the display changes accordingly, the touchscreen 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 with logo and other indications of its state as the CPU
goes through its initialization process.
TO TEST POINT
# NAME #
1 +5 2
3 +15 4
3 -15V 5
3 Dgnd 1
1 Chassis N/A
6 +12V 7
6 Dgnd 1
Analyzer Operation Manual
2
MIN V MAX V
4.85 5.25
13.5 16V
-13.5V -16V
-0.05 0.05
-0.05 0.05
11.75 12.5
-0.05 0.05
07275B DCN6418