QM-7 SERIES SERVICE MANUAL
PAGE 4.10
JANUARY 2012
SUNRISE MEDICAL
Section 4
Tilt/Lift Will Not Operate
1. Select tilt on the hand control (
fi
gure. 4.10.3).
Operate the joystick and listen closely to the
control module for a click. This click indicates
that the control module is closing the power relay
inside and supplying power to the tilt actuator.
If no click is heard, replace the control module.
Refer to Control Module Removal in section 7 of
this manual. Retest as necessary. If click is heard
proceed to step 3.
The tilt actuator used in the tilt system receives
power through a 6-pin connector located at the
rear of the tilt See "B" (Figure 4.8.2). The actuator
also contains micro-switches that open at the
end of their stroke to prevent stressing of the tilt
system. Around these micro switches are diodes
that allow reverse power to
fl
ow to the actuator
when reversing direction.
5. Select tilt on the hand control and place a
rubber band around the joystick to hold it displaced
(
fi
gure 4.10.4).
fig. 4.10.3
fig. 4.10.4
6. Test the micro-switch with the following test.
a. Ensure that the tilt is beyond 20 degrees tilt.
b. Use Multimeter and measure continuity between
the indicated pins (
fi
gure 4.10.1) on the 6-pin
connector mounted on the tilt. When seat is tilted
the indication should be open (
fi
gure 4.10.2).
c. If it is closed, check parts manual for availability
of the micro-switch assembly. Refer to Micro-
Switch Removal, and Tilt Actuator removal
subsections in section 7 of this manual.
d. Retest as necessary.
fig. 4.10.2
fig. 4.10.1
2. Verify that tilt is selected on the hand control.
Operate the joystick and listen closely to the tilt
actuator. If the actuator appears to be running but
the tilt is not moving, replace the tilt actuator. Refer
to Micro-Switch Removal and Tilt Actuator removal
section of this manual. Retest as necessary.
3. If tilt will still not operate, locate the 6-pin
connector on the rear of the tilt See "B"
(
fi
gure 4.8.2).
4. Disconnect the 6-pin cable leading to the
control module.
