Troubleshooting and Service Teledyne API T802 Paramagnetic O2 Analyzer Operation Manual
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Table 11-6: DC Power Supply Acceptable Levels
CHECK RELAY BOARD TEST POINTS
FROM TEST POINT TO TEST POINT
POWER SUPPLY
ASSY VOLTAGE
NAME # NAME #
MIN V MAX V
PS1 +5 Dgnd 1 +5 2 4.85 5.25
PS1 +15 Agnd 3 +15 4 13.5 16V
PS1 -15 Agnd 3 -15V 5 -13.5V -16V
PS1 Agnd Agnd 3 Dgnd 1 -0.05 0.05
PS1 Chassis Dgnd 1 Chassis N/A -0.05 0.05
PS2 +12 +12V Ret 6 + 12V 7 11.75 12.5
PS2 Dgnd +12V Ret 6 Dgnd 1 -0.05 0.05
11.6.3. I2C BUS
Operation of the I2C 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
intact, the I2C 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.
11.6.4. TOUCHSCREEN INTERFACE
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.
11.6.5. LCD DISPLAY MODULE
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.
07275B DCN6418