PS
S8.0
8200
001
OE35
Version no
T-code
F-code
Section
C-code
Micro 70 Wire Guidance
320
Service Manual
1997-10-24
does not matter which wire the positive lead or
negative lead of the volt meter is connected to.
As the antenna is moved across the guidewire check
for the voltage between S+ and S- to change from
positive ten volts (+10 volts) to negative ten volts (-
10 volts). If voltage does change as stated use chart
4 troubleshooting. If voltage does not change as
stated continue with tests below.
d. Check for positive (+) 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.
If not 12 volts +/- 0.5 volts, the Micro 70 controller is
likely failed.
e. Check for positive (+) 12 volts between FTI 7
connectors K3-1 and K3- 5. K3-1 should be positive
on the volt meter leads and K3-5 should be negative.
If not 12 volts +/- 0.5 volts, repair open red or black
wire between FTI 7 and Micro 70 controller.
f.
Check for positive (+) 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
+/- 0.5 volts, replace FTI 7.
g. Check for positive (+ ) 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 +/- 0.1 volts,
repair open red or black 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.
h. With the steering in the straight ahead position check
for 2.5 volts on the white wire on terminal 2 of the
steering feedback potentiometer. If not 2.5 volts, try
adjusting feedback potentiometer to obtain
a
centered voltage value of 2.5 volts. (See Truck Set
Up On Site.) If unable to obtain 2.5 volts, replace
steering feedback potentiometer.
i.
With the steering in the straight ahead position check
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