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Chapter 6
Maintenance
This chapter describes routine maintenance, along with troubleshooting instructions for the power meter and
power sensor. Disassembly instructions for the Bird Cal Cart are also provided. For service beyond this level, return
the unit to a qualified service center.
The Bird 4421 Power Meter requires only simple, routine maintenance.
Wipe off dust and dirt regularly.
Check the connectors and cables for damage.
Clean the connector contacts with alcohol or dry cleaning solvent.
Cleaning
Clean the Bird 4421 Power Meter and its display with a soft cloth dampened with mild detergent and water only.
Clean sensors with a dry cleaning solvent that leaves no residue.
Troubleshooting
Since the power meter and power sensor can only work together, the first step is to determine which is
malfunctioning. Connect the power sensor to the meter and perform the
"Functional Test" on page 35
. If the
power meter is malfunctioning, refer to the troubleshooting table below. If the power sensor is malfunctioning,
return it for service.
This manual cannot list all malfunctions that may occur, or corrective actions. If a malfunction is not listed or is not
corrected by the listed corrective actions, contact a qualified service center.
Note:
For power sensors in Cal Carts, following the test procedure will check the sensor not covered
by the safety cover. To test the other sensor slide the safety cover over, then proceed as normal.
WARNING
To avoid personal injury, disconnect the power cord from the AC line before
performing any maintenance, including fuse replacement or changing the line voltage
setting.
WARNING
Never attempt to connect or disconnect RF equipment from the transmission line
while RF power is being applied.
Leaking RF energy is a potential health hazard.
CAUTION
Do not use harsh or abrasive detergents for cleaning.
CAUTION
Due to the complexity of the Bird Power Sensor, field repairs beyond general
maintenance should not be attempted.
Removal or disturbance of the power sensor cover can result in cancellation of lifetime
warranty.
