RVV Gen II KO Service and Parts Manual
52
SECTION 5: Troubleshooting
IV.
Sensor Test
Pressing <enter> at
Sensor Test
will cause the vender to display the current state of the sensors on the DMC (Drive
Mechanism Controller board). The following will be displayed:
MAG (0/1) Y (0/1) CS (0/1)
PDOOR (0/1) BIN (0/1)
These codes correspond to the following:
A.
MAG
corresponds to the Hall Effect home sensor that is used for finding the home position in the X-axis.
B.
Y
corresponds to the Y-axis home sensor.
C.
CS
corresponds to the cup sensor.
D.
PDOOR
corresponds to the port door.
E.
BIN
corresponds to the delivery bin sensors (emitter and detector).
F.
0
or
1
corresponds to the sensor’s state:
0
= off,
1
= on.
This test allows service personnel to observe if there are any problems with any of these sensors. Pressing <exit> will
terminate the test.
Note:
The sensor test can be performed with the door OPEN or CLOSED.
NOTE:
If all sensor tests fail,
check for 5 VDC on the black and green wires at pinout P1 on the cup logic board. If
voltage
is
found, replace the cup logic board. If
no
voltage is found, replace the DMC board.
A.
MAG
On the front of the cup (as viewed from inside the vender’s door), there are three visible wires (red, green, and
black) that run into a sensor.
(Refer to Figure 5.9.)
This is the Hall Effect sensor, which detects the home position
magnet located under the bottom shelf. Place a magnetic screwdriver or other
south-polar
magnetic device directly
in front of this sensor. The display should change from “
MAG 0
” to “
MAG 1
.”
NOTE: If no magnetic device
is available,
place the cup in the middle of the door, then close the door completely. The cup will then perform a
homing routine. As the cup passes the homing magnet, the display should briefly change from “
MAG 0
” to “
MAG
1
.”
1. Make sure the X-home magnet bracket mounted under the bottom product shelf is in the proper position. The
magnet should be facing you and should be flush with the front edge of the bottom shelf.
(Refer to Figure 5.29.)
2. If the display does not change, remove the top of the cup, and check the harness connection at pinout P4 on the
cup logic board.
(Refer to Figure 5.10.)
Make sure there are no loose wires and the connection is tight.
3. Using a voltmeter, check for 5 VDC on pins 1 and 2 (black and green wires) at pinout P4 on the cup logic board.
If
no
voltage is found, replace the logic board.
4. 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 Hall Effect sensor.