Ion Source Board - Measurement Points - Agilent Technologies VS Series Operation Manual

c. Turn down the emission current to .702 and perform a full calibration and verify that
it was successful.
No Ion Peak error message and a flashing C appear on the front panel display after a
calibration attempt
Output from A/D converter on the pre-amp board is constant (no- change in reading).
Causes/Resolutions
1. Int. Cal Leak option - 3-way valve not activating. There is a defective calibrated leak.
2. External calibrated leak not installed or defective (customer) valve or signal.
3. Cable (w/RJ45 connectors) from Pre-Amp board to motherboard disconnected:
Check the cable and re-calibrate.
4. Pre-Amp board failure (Figure C-3 on page C-7):
a. Measure the voltage, with respect to ground, on the pre-amp board J3 connector
OUT pin.
b. Monitor the output voltage during the calibration routine.
c. Monitor the A/D output from the Pre-Amp board by connecting a laptop to the leak
detector using HyperTerminal.
d. Enter the command: 'AD_READ @ . CR 1 SECS MANY
The following response appears (example):
8390438...8391004...8390710...8390937 (continues until ESC is entered).
e. Perform a full calibration and note the electrometer output voltage. The voltage
should be scaling up and down as the ion voltage is scanning. The same should be
happening for the A/D output.
f. If the:·
C-12
VS Series Component Leak Detector
Figure C-4 Ion Source Board - Measurement Points
Response back from the A/D is not changing, the A/D on the Pre-Amp board is
defective. Replace the Pre-Amp board.