Micro 70 Wire Guidance
PS
S8.0
8200
F-code
Section
C-code
Version no
T-code
001
OE35
© BT Products
323
Service Manual
1997-10-24
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 guide wire if the approach angle is too great.
a. Verify that frequency of line
driver
matches
frequency of Micro 70 system.
The Micro 70 frequency must match the frequency of
the line driver. The Micro 70 frequency can be
adjusted with connections on the Micro 70 controller
at connector K6 pin numbers 7 and 8. By changing
the arrangements of how K6-7 and K6-8
are
connected, the Micro 70 controller can be adjusted
to guide on a frequency of 2.2 KHz, 5.2 KHz, 6.25
KHz or 7.0 KHz. There are wires in the wiring
harness provided for making these connections.
These wires are routed through the wiring harness to
be hidden behind the Micro 70 controller. It is
unlikely that these connections would be changed by
unauthorized persons because the wires are taped
down to the harness. For 2.2 KHz both connections
should be open. For 5.2 KHz the wire from K6-7
should be connected to battery negative wire 13; the
wire from K6-8 should be left open. For 6.25 KHz the
wire from K6-8 should be connected to battery
negative wire 13; the wire from K6-7 should be left
open. For 7.0 KHz both wires from K6-7 and K6-8
should be connected to battery negative wire 13.
b. Verify operation of the line driver and integrity of
guidewire loop.
This can be done by measuring the current, in
milliamps, flowing through the guidewire. A reading
of zero milliamps indicates an open wire in the
guidewire loop or a failed line driver. Depending on
the line driver, the frequency, and the length of the
guidewire loop the current flow in the guidewire loop
can be from 75 to 150 milliamps.
c. Check for damaged antennas and properly mounted
antennas. If damaged, replace antennas.
The following tests are to be made with the truck power
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