RVV Gen II KO Service and Parts Manual
58
SECTION 5: Troubleshooting
FIGURE 5.21.
Locations of emitter and detector boards
Check the harnessing to both of these boards.
The detector board is located under the black plastic cover on the
top of the port box housing.
The emitter board is located under the port box housing, attached
to the port housing bottom.
FIGURE 5.22.
Locations of metal tabs
Check to make sure the two metal tabs on the emitter
board’s metal mounting plate are inserted properly.
Metal tab (one on each side of port box housing)
2. Check the harnessing to the emitter and detector boards located in the product bin.
(Refer to Figure 5.21.)
3. Check the harnessing on both control boards, at position P4 on the DMC board (5 VDC on the black and brown
wires) and at position P11 on the VMC board (5 VDC on the red and white wires). If no voltage is found,
replace that particular board.
4. Check for coins or debris under or on top of the emitter and detector boards. Remove and reseat the emitter and
detector boards, ensuring that the metal plate the emitter board sits on is properly inserted into the two metal
tabs under the port assembly.
(Refer to Figure 5.22.)
5. If all the above is good, replace the detector board first. Test the vend mechanism. If the error still exists,
replace the emitter board.