Troubleshooting in theField 7
Does the base station have an unobstructed view of the sky to within about
10° of the horizon across the entire work area?
Is the base station near any large reflective surfaces that could cause the
GNSS signal to “ghost” (multipathing)?
Is the base station area subject to heavy vehicle movements that could
shadow the base station antenna from the GNSS signal?
l Is your machine in the line of sight of the base station radio antenna? If not,
you may need to ask your site supervisor to install a repeater radio.
l Do you rely on repeater radios to make contact with the base station? If so, ask
your site supervisor to check the operation of any data radio repeaters on the
site. Is data being relayed correctly?
7.8 Troubleshooting UTS systems
To quickly assess the UTS components of a system, check the following:
l Are the yellow MT900 machine target LEDs, located at the top of the target,
flashing? If these LEDs are not flashing, then the UTS instrument will not be
able to lock onto the target.
Note – The red LEDs do not flash and do not indicate target lock.
l Use the information in 7.3 Running system diagnostics, particularly 7.3.1 UTS
diagnostics, to check the following:
Is the UTS connected?
Does the UTS instrument have the correct software and firmware loaded?
Contact your site supervisor to find out what the correct software and
firmware is for the UTS.
Place the cutting edge focus point at a control point. Is the position of the
focus calculated correctly?
l Check that the correct model of radio is installed:
For an SPSx30 UTSinstrument, use an SNRx10 radio with a 2400MHz
module installed.
l Use the information in 7.6.3 SNRxxx radio modem status indicator to check the
following:
Is the data radio getting power?
Is the data radio synchronized?
Are you on the correct radio channel?
GCS900 Grade Control System for Excavators Operator's Manual 185
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