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PS
S8.0
8200
001
OE35
Version no
T-code
F-code
Section
C-code
Micro 70 Wire Guidance
310
Service Manual
1997-10-24
9. Troubleshooting Information
To use this troubleshooting guide go to the appropriate chart
that best describes the symptoms of the failure. Perform the
checks indicated to trace the possible causes of the failure.
In the troubleshooting charts the connections on the Micro 70
controller are identified by the connector number and the pin
number within the connector. For example, K8-3 indicates the
number 3 pin in the number 8 connector on the Micro 70
controller. There are
ten connectors on the Micro
70
controller and they are numbered from left to right. Therefore
the three-pin connector on the far left of the controller is K1
and the computer plug connector on the far right is K10.
The FTI 7 also has three connectors; K1, K2, and K3. These
will be specified as FTI 7 connectors when first named in any
test.
The steering servo amplifier has the label "FSA 23" on it.
Because of the length of the component name and the ease
of identification the steering servo amplifier will be referred to
as the "FSA" in the troubleshooting charts.
It is critical that the Micro 70 components be properly
installed. In particular the antennas must be installed so that
the epoxy filled side is facing away from the center of the
truck.
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.
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