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Micro 70 Wire Guidance
PS
S8.0
8200
F-code
Section
C-code
Version no
T-code
001
OE35
© BT Products
315
Service Manual
1997-10-24
test results before replacing Micro 70 control unit.
3. Truck operates normally in manual mode, but the alarm
sounds and parking brake sets when truck operator
chooses auto mode. Tests are to be made with Micro 70
system in auto mode but with truck away from
guidewire.
a. Begin testing by driving truck, in manual mode, away
from guidewire and then pushing the auto/manual
switch until the "auto" light comes on.
b. Check for 24 volts at Micro 70 connector K8-2. If not
24 volts, replace Micro 70 controller.
c. Re-evaluate symptoms; possible chart 2 needed for
troubleshooting.
4. The truck will not guide in auto mode. Truck operates
normally in manual mode but, when switched to auto
mode and the guidewire is acquired (green "on wire"
light comes on), The Micro 70 system will not make any
steering corrections; steering effort is same in manual
and auto modes.
This chart is meant for a truck that will not make any steering
corrections even though the "on wire" light comes on. If the
truck even tries to make steering corrections go to chart 6.
a. Drive the truck in manual mode and take note of the
effort required to turn the steering wheel.
Now drive the truck along the guidewire in auto
mode with the green “on wire” light on. Take note of
the effort required to turn the steering wheel when
the green “on wire” light is on. If the steering efforts
are the same continue with step b below. If the
steering effort is harder in auto mode, with the green
“on wire” light on, go to chart 5.
b. Inspect mechanical coupler between electric
steering motor for Micro 70 system and hydraulic
torque generator on truck. Make repairs as needed
and re-evaluate symptoms.
Make the following tests with the Micro 70 system in the auto
mode and the truck over the guidewire so that the green "on
wire" light is on. The foot pedal must be depressed so that the
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