Revision 2012.02.27
37
Q:
My machine will vend a product, display Vend Error then give my money back or allow me take make an
alternate selection.
A:
This indicates there is a problem detected with the vend motor. Each vend motor has a small micro switch inside
that indicates when the motor has made one full revolution and returns back to what is referred to as the “home position”.
If this signal is not received back to the controller in a specified amount of time the controller will indicate and error and
refund the money. The problem could be in an individual motor itself, the tray wire harness or any connection in between
the tray to the control board. If the whole tray acts this way that usually indicates that the tray harness or any connection
in between to the controller may be bad. The easiest way to troubleshoot this situation would be to swap tray connections
where the tray harness plug plugs into the machine. For example it the problem appears on the A tray, unplug the A tray
and the B tray (assuming they both have the same number of selections), swap the connections and plug the A tray into
the B tray receptacle and vice versa. Now do your test vending by selecting the B selections on the keypad and the A tray
should operate. If the problem follows the tray then suspect either the motor or the tray cable harness. If the problem
stays with the A receptacle and now the B tray exhibits the problem then the problem is in a connection somewhere
between the A receptacle and the controller board. Make sure to examine any and all connections for any loose wires,
etc.
Q:
My display is dead or intermittent but the rest of the machine appears to be working.
A:
Check the gray flat ribbon cable connection between the display and the controller board to insure the plugs are
plugged in securely.
Q:
My machine will not cool.
A:
Several things to check here.
1. Make sure the machine programming is set up properly so that Zone 2 is enabled and the proper temperature
limits are set for Zone 2. Zone 2 lower should be set around 37 degrees and Zone 2 upper should be around
5-6 degrees warmer. If the temperature is set too cold then you risk the chance of evaporator freeze over.
2. On models equipped with a refrigeration fuse make sure it is not blown. The fuse needs to be a 20 amp Slo-
Blo fuse. Nothing less. An easy way to test the fuse is to press on the lower door switch to see if the 3
evaporator fans run that are located below the bottom tray.
3. Inspect the evaporator coil to see if it may be frozen over. Using a flashlight shine it into the 3 evaporator fans
located under the bottom tray. You are looking for aluminum fins behind the fan motors. If they are completely
white or solid with ice this will keep the air from flowing properly and cause the machine to not cool. To thaw
out remove the 3 prong condensing unit plug, not the evaporator fan plug and just close the door and let set
for overnight to insure it completely defrosts. Be prepared in case the defrost water pan overflows on the floor.
You may need to set some towels around and under the machine to catch any overflow. After the machine is
thawed completely out you will want to check the temperature settings to insure they are not set too cold. You
may also enter the Advanced menu and check the defrost settings. The standard defrost settings are for a
duration (DUR) of 25 minutes and interval (INT) of 3 hours. This can be changed if need be. Press the lower
door switch to insure all 3 evaporator fans run. Also close the door and listen to hear if the fans start when
you close the door. If they don’t this will also cause a freeze over. You may need to adjust the door switch to
facilitate proper operation.
4. Check the upper door switch. The easiest test is to close the door then while opening the door watch the
display to see if you see the message Sales Value $xxxx.xx in the display. If you do not then suspect the
upper door switch may need adjustment. You can reach over the door and press it manually while watching
the display to see if it works.
5. As a manual test of the cooling system you can enter the Diagnostics section of the menu and select the
Relays test function. Select Relay 02, press F and the cooling system should turn on momentarily.
6. Another manual test you can try on models equipped with a standard 3 prong receptacle for the cooling
assembly is unplug the cooling assembly plug from the refrigeration control panel and plug that cord into a
standard 3 prong extension cord. The cooling system should run.
Cabinet Assembly
CAUTIONS
:
1. High voltage is located in the area of the unit and could cause injury or death.
2.
Replacement of the bill acceptor, coin changer, front panel display, system control board or
vend motors should only be performed by trained personnel.
