Micro 70 Wire Guidance
PS
S8.0
8200
F-code
Section
C-code
Version no
T-code
001
OE35
© BT Products
321
Service Manual
1997-10-24
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.
j.
With the steering in the straight ahead position check
for 5 volts at FTI 7 connector K3-2. If not 5 volts, try
adjusting zero potentiometer on FTI 7 to obtain 5
volts. If unable to obtain 5 volts, replace FTI 7.
6. Truck will not guide in auto mode. Truck operates
normally in manual mode but, when switched to auto
mode and the guidewire is acquired in the steer wheel
direction (green “on wire” light comes on), the Micro 70
system will start to make steering corrections but quickly
looses the wire and sets the parking brake with an
audible alarm.
Before beginning any testing be sure to read and
understand the Micro 70 system operation. Operating
instructions can be found in
this manual
under
"Operation." It is possible for the Micro 70 system to
start to make steering corrections without fully acquiring
the guidewire if the approach angle is too great.
Also go to the section in this manual "Truck Set Up On
Site" and go completely through all of the adjusting
procedures again before beginning any testing.
a. Check for 12 volts between K7-6 and K7-9 on the
Micro 70 controller. K7-6 should be positive on the
volt meter leads and K7-9 should be negative.
b. Check for 12 volts between K3-1 and K3-5 on the
FTI 7. K3-1 should be positive on the volt meter
leads and K3-5 should be negative. If not 12 volts +/-
.5 volts, repair open red or black wire between FTI 7
and Micro 70 controller.
c. Check for 5 volts between K2-1 red wire and K2-3
black wire on FTI 7. The red wire on K2-1 should be
positive on the volt meter leads and the black wire on
K2-3 should be negative. If not 5 volts, replace FTI 7.
d. Check for 5 volts between the red wire on terminal 1
of the steering feedback potentiometer and the black
wire on terminal 3 of the steering
feedback
potentiometer. If not 5 volts repair open red or black
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