QM-7 SERIES SERVICE MANUAL
PAGE 3.6
JANUARY 2012
SUNRISE MEDICAL
Section 3
3. Otherwise, check the brushes on the Right
motor (figure 3.6.1). Using a Flat head screwdriver
remove the brush cap to access the brush. Refer
to section 6 (Motor Brush Inspection). Ensure
brush is not excessively worn, (brushes need
to be at least 1/2" long) note taper on brush for
re-installation (figure 3.6.2) Replace as required
(figure 3.6.3.
Fig 3.6.1
1. Check that the batteries are fully charged
and in good condition; and check all cables and
connections. Check the connections to the right
motor, look for a loose or damaged connector.
2. If the reading is short, (resistance is less than
10 K ohms) on any of the readings, proceed to
check the 4-pin motor connector. Measure the
resistance from the bottom contact of the red thick
wire on the 4-pin right motor connector to each of
the top contacts of the connectors see (figure
3.6.4). Measure the resistance from the bottom
contact of the black thick wire on the 4-pin right
motor connector to each the top contacts of the
connector (below right). If all of the readings are
open, (figure 3.6.5) then replace the controller. If
any of the readings are short, then replace the
right motor.
Five Bars - Right Motor Wiring Trip
Fig 3.6.4
Test 1
Test 2
Test 3
Test 4
Fig 3.6.3
Fig 3.6.5
Fig 3.6.2
