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Teledyne API T703 Calibrator Operation Manual General Troubleshooting & Repair
201
A voltmeter should be used to verify that the DC voltages are correct per the values in the table below, 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 11-7: DC Power Supply Acceptable Levels
CHECK RELAY PCA TEST POINTS
FROM TEST POINT TO TEST POINT
POWER
SUPPLY
ASSY
VOLTAGE
NAME # NAME #
MIN V MAX V
PS1 +5 Dgnd 1 +5 2 4.8 5.25
PS1 +15 Agnd 3 +15 4 13.5 16V
PS1 -15 Agnd 3 -15V 5 -14V -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 +12 V ret +12V Ret 6 Dgnd 1 -0.05 0.05
11.4.4. I
2
C BUS
Operation of the I
2
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
2
C bus is operating properly if D1
on the relay PCA and D2 of the Valve Driver PCA are flashing
There is a problem with the I
2
C bus if both D1 on the relay PCA and D2 of the Valve Driver PCA are ON/OFF
constantly.
11.4.5. TOUCHSCREEN INTERFACE
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.
11.4.6. 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 and other indications of its state as the CPU goes through its
initialization process.
07223B DCN6378