RVV Gen II KO Service and Parts Manual
54
SECTION 5: Troubleshooting
FIGURE 5.11.
Elevator arm and vertical home switch
Make sure the elevator arm is level and it is all the way down on the vertical home switch.
Elevator arm
If the elevator arm is not parallel with the
bottom of the door, hold the higher side
steady and pull up on the lower side until it
is level.
Vertical home switch
The switch is under a black plastic cover.
Check to make sure the elevator arm rests
on this switch. Also, check all wiring to the
switch to make sure there are no wires loose,
disconnected, cut, pinched, etc.
C.
CS
The cup sensor is actually two separate components: an infrared emitter, located on the right side of the cup; and a
detector, on the left side of the cup.
(Refer to Figure 5.12.)
To test the sensors, break the infrared beam by placing a
hand or other item in front of one of the sensors. The display should change from “
CS 0
” to “
CS 1
.”
1. If the display does not change, check the emitter lens (clear) and detector filter (dark) to make sure they are not
creased or wrinkled.
(Refer to Figure 5.13.)
If the lens and filter are creased or wrinkled, they could possibly
slide down below the emitter or detector, causing the optics to fail. If one of the lenses is creased or wrinkled,
replace it.
2. Remove the top of the cup, and check the harness connections at pinouts P6 and P7 on the cup logic board.
(Refer to Figure 5.14.)
Make sure there are no loose wires and the connections are tight. Also, check the
connections at the emitter and detector boards.
3. Using an ohmmeter, check for continuity on all wires in the harnessing from the DMC to the cup logic board.
If
any
wire fails, replace the harness. If
all
wires pass, replace the cup logic board. If the problem persists,
replace the cup emitter and detector.