QM-7 SERIES SERVICE MANUAL
PAGE 4.12
JANUARY 2012 SUNRISE MEDICAL
Section 4
Positive probe here
Negative probe here
Continuity between pins
Positive probe here
Negative probe here
Open between pins
Negative probe here
Positive probe here
Open between pins
Negative probe here
Positive probe here
Continuity between pins
9. Example 1, Tilt in mid-stroke. Measure
continuity between the pins indicated (fi gure
4.12.2) this is the resistance through the actuator
motor windings (Figure 4.12.1). If this reading is
not correct, replace the tilt actuator and retest.
10. Example 2, Tilt in full down position (Figure
4.12.3). If the readings are not correct, replace
the tilt actuator. Refer to Tilt Actuator and Micro-
Switch Removal section this manual. Retest as
necessary.
11. Example 3, Tilt in full up position (fi gure
4.12.4). If the readings are not correct, replace
the tilt actuator. Refer to Tilt Actuator and Micro-
Switch Removal section this manual. Retest as
necessary.
*SEE NOTE*
fig. 4.12.3
fig. 4.12.4
*SEE NOTE*
Note: If the tilt actuator does not operate, it is only possible to check for one condition. Pick
the condition below that best describes the position of the tilt system.
Note: The value recorded in one direction is the forward resistance through a diode and will
vary with the type of Multimeter used. This value is not important, as long as there is continuity
in one direction only. This value may even be high. The value recorded in the other direction
is across the open contact of the end of stroke micro-switch and should be open.
Note: The value recorded in one direction is the forward resistance through a diode and will
vary with the type of Multimeter used. This value is not important, as long as there is continuity
in one direction only. The value recorded in the other direction is across the open contact of
the end of stroke micro-switch and should be open.
fig. 4.12.1
fig. 4.12.2
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