INFICON SQM-242 Thin Film Deposition Controller Card Operating Manual - Manual (Page 71)

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SQM-242 Operating Manual
7.3.1 Diagnostic Procedures
The following diagnostic procedures employ the Crystal Sensor Emulator to
analyze a constant Crystal Fail message. The symptom is a Crystal Fail message
that is displayed by the SQM-242 software even after the monitor crystal has been
replaced with a new good monitor crystal.
7.3.1.1 Measurement System Diagnostic Procedure
1 Refer to Figure 7-8 on page 7-16 . Remove the six-inch BNC cable from the
Feed-Through at point A.
2 Connect the Crystal Sensor Emulator to the 6 inch BNC cable at Point A.
 If the Crystal Fail message disappears after approximately five seconds,
the measurement system is working properly. Re-install the six-inch BNC
cable to the Feed-Through. Go to
section 7.3.1.2 .
 If the Crystal Fail message remains, continue at step 3.
3 Disconnect the six-inch BNC cable from the Oscillator and from the Emulator.
4 Visually inspect the six-inch BNC cable to verify that the center pins are seated
properly.
5 Use an Ohm meter to verify the electrical connections on the six-inch BNC
cable.
 There must be continuity (<0.2 ohms after accounting for resistance of
ohmmeter leads) between the center pins.
 There must be isolation (>10 megohms) between the center pins and the
connector shield.
 There must be continuity between the connector shields.
Replace the six-inch BNC cable if it is found to be defective and repeat Step 2
of this procedure.
6 If the six-inch BNC cable is not defective, re-connect the six-inch cable to the
oscillator and to the Crystal Sensor Emulator. If the Crystal Fail message
remains, contact INFICON.