BT OE35, Service Manual

Page: 324 / 332

PS S8.0 8200
001 OE35
Version no T-code
F-code Section C-code
Micro 70 Wire Guidance
322 Service Manual 1997-10-24
wire between FTI 7 and steering feedback
potentiometer.
The following tests use K1-2 on the Micro 70 controller
for the volt meter negative connection
e. With the steering in the straight ahead position check
for 5 volts on the white wire on terminal 2 of the
steering feedback potentiometer. If not 5 volts, try
adjusting feedback potentiometer to obtain
a
centered voltage value of 5 volts. (See Truck Set Up
On Site.) If unable to obtain 5 volts, replace steering
feedback potentiometer.
f. With the steering in the straight ahead position check
for 2.5 volts on the white wire at the FTI 7 K2-2
connector. If not 2.5 volts, repair open white wire
between steering feedback potentiometer and FTI 7.
g. Check for smooth voltage transition on the white wire
at FTI 7 K2-2 as the truck is steered left and right of
straight ahead. If not a smooth voltage transition
replace feedback potentiometer.
h. With the steering in the straight ahead position check
for 5 volts between K3-2 and K3-5 on the FTI 7. K3-2
should be positive on the volt meter leads and K3-5
should be negative. If not 5 volts, repair open white
or black wire between the FTI 7 and the Micro 70
controller.
I. Tests indicate possible failed Micro 70 controller. Re-
evaluate symptoms and retest.
7. Truck will not guide in auto mode in either direction.
Truck operates normally in manual mode but, when auto
mode is chosen the Micro 70 system does not detect
guidewire, “on wire” light does not come on and Micro
70 does not try to correct steering.
This chart is meant for a truck that will not make any
steering corrections and the "on wire" light will not even
flicker on. If the truck even tries to make steering
corrections go to chart 6. If problem occurs only in load
wheel direction go to chart 8.
Before beginning any testing be sure to read and
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