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ADFM® Flow Meter
Section 3 Maintenance and Troubleshooting
3-8
It is not necessary to follow these procedures for routine mainte-
nance. However, the Built-In Tests may be executed on a routine
basis.
For the following procedure, the top cover of the ADFM controller
must be removed from the chassis. This exposes the controller’s
circuitry, which contains electro-static sensitive devices. To
prevent electro-static discharge (ESD) to these components, you
must ground the controller as well as yourself. Use an ESD wrist
strap (or other accepted means) to ground yourself. Please keep
in mind that even if an ESD has occurred, the ADFM may still
work, but its reliability may be seriously impaired.
3.4.3 BIT Not Executing (Box
Controller Only)
If the built-in test (BIT) cannot be executed, it is likely caused by
either faulty communication, or power loss or a faulty ADFM
power supply.
Communication If communication cannot be established, the following procedure
may help you to isolate the problem:
1. Verify that the internal or external power sources are prop-
erly connected to the ADFM, and sufficient to supply it.
2. Verify that the computer’s serial port is functioning nor-
mally. In Windows, go to Start, Settings, Control Panel.
Select System, go to the Hardware tab, and click Device
Manager and Ports to determine if the computer’s serial
port is properly operating. Verify line continuity on the
RS-232 Serial Communications Cable.
3. If remote communications still cannot be established, per-
form a manual reset by turning and releasing the keyed
RESET switch on the ADFM box’s inner front panel, or by
disconnecting and reconnecting power from the ADFM
canister. This should start the built-in test. If you are using
the box enclosure, the wake-up message, and a series of
built-in test results, should appear on the ADFM’s display.
4. If these steps are not successful, the motherboard may
have to be replaced.
5. If all tests are successful (i.e., the computer screen pro-
duces normal, legible results), yet the ADFM box display is
blank or scrambled, the display or front panel interface
may need to be replaced.
6. It is also possible that there is a problem with the power
supply, as discussed in the following section.
Power If the Built-In Tests cannot be executed locally or remotely, or if
communication cannot be established, perform the following
steps to isolate the problem:
1. If you tried to use internal batteries to power the ADFM,
you may alternatively try DC power if possible. If you are
successful, the problem is likely to be a faulty battery
switch, or its wiring. Also check the internal batteries’ wir-