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NOTES
The 691 System and "Motor Up"
LED come on unexpectedly without
being activated.
1. The control module is receiving false signals.
Be sure stray signals are not being introduced into the external inputs. If the
gray wire is not connected to an external input, ensure that it is capped off
and not shorting to ground inadvertently. NOTE: While deactivated, occa-
sional operation of power unit and "Motor Down" LED is normal to
relieve pressure caused by thermal expansion of fluid in the power unit.
While the 691 System is activated,
the power unit and horn activate
intermittently.
1. Change in temperature has caused the system to contract and reduce
brake system pressure.
The power unit runs briefly to restore brake system pressure to the original
lock-up pressure. This is considered normal operation as fluid temperature
changes.
2. The service brake system or 691 System has air in it.
Bleed service brakes and 691 System.
3. Hydraulic leak in either the 691 System or service brake system.
Inspect all tubing and connectors for leaks and tighten or replace as
necessary.
4. The power unit is not functioning properly.
Replace the power unit. (No test to troubleshoot this condition).