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Trouble Shooting
Ch1. Proper way to fill a column
Ch2. Cleaning the rollers
Ch3. Adjusting the column
Ch4. Swapping columns
Ch5. Column gears
Ch6. The optical sensor
Ch7. PCB layout
Ch8. DC voltage
Ch9. Changing chips
Ch10. Changing door LED bulb
Ch11. Adding a sign above LED bulb
Ch12. Changing the Lexan film
Ch13. Dealing with defective door switch
Ch14. Main door switch
Chapters (click on any of the following sections to view)
1. Proper way to fill a column
Make sure the tickets are relatively straight … … and not excessively warped: this can cause jams Excessive warping can be eliminated by moderately bending the tickets in the direction opposite to the warp (or ‘bow’ as it is sometimes called). The ideal ticket will only have a slight or hardly-visible bow
The tickets must be loaded in the column with the bow down (the size of the bow in the image is an exaggeration for the sake of emphasis)
1. Proper way to fill a column
Load just one ticket.This ticket should automatically slide under the ticket gate (if it does not, the ticket gate is too tight and will need to be adjusted: part #3 of this presentation)
Do not release the tickets from too high up … this can cause the bottom
tickets to fall at too steep of an angle
Manually turn the biggest gear until the LED in front of the column turns off (the ticket should have moved forward about ½”)
Load the rest of the tickets in comfortable chunks: with one hand balance a group as it is being lowered down the column … with the other hand ruffle the tickets slightly once or twice (by gently running the back edge of the fingernail upward,
against the tickets: this straightens them out). With a little practice, an entire column can be filled in seconds
2. Cleaning the rollers
TURN OFF THE POWER
(and unplug the battery)
before performing this procedure
TURN OFF THE POWER
2. Cleaning the rollers
The rollers maneuver the ticket from the bottom of the column to the dispensing chute. They need friction – the ability to ‘grab’ the ticket - in order
to be able to reliably perform their job.
This friction is achieved by the rough coating applied to the rollers (which is visible in this picture). This coating is very resilient: it hardly ever gets damaged. What does happen, however, is that waxy glazing from the tickets, over time, deposits on top of the coating
Cleaning the rollers of this waxy residue is one of the more important maintenance routines to be performed (recommended every 2 months on busy machines). It is also a quicker (and many times more relevant) fix to a misbehaving column than gate adjustments and column swaps, which are discussed later in this presentation
2. Cleaning the rollers
Materials: a well-wrung, damp cloth (either warm water, Windex, or white vinegar may be used) – because of the liquids the machine should first be turned off
Press the damp cloth against the rollers (green arrows) and manually turn the gears (red arrows). All tickets must be dispensed in order to reach the back roller but the
column does not need to be removed …
2. Cleaning the rollers
To remove any excess moisture, perform a final run with a dry cloth … if you suspect that liquid has dripped onto electronic components, do not turn on the machine. This scenario can be avoided by applying moisture
only to a miniscule portion of the cloth and by wringing it out sufficiently before applying the liquid to the rollers
3. Adjusting the column: ticket gate
Start with: 1 empty column and 2 ticketsDrop the tickets inside the column, but do not manually feed the first ticket as you
normally would when preparing to dispense
3. Adjusting the column: ticket gate
Using a 11/32 nut driver loosen the gate which regulates the flow of ticketsUsing a pen, or other sharp object – lift the gate until the tickets fall down and lie flat
inside the columnNotice how both tickets now lie under the column gate
3. Adjusting the column: ticket gate
Push down firmly on the gate [notice how the tickets rise] and re-tighten the two nuts before releasing
3. Adjusting the column: ticket gate
• Using the large gear on the side of the column, roll the two tickets out
Always test the column after doing a gate adjustment
• Re-feed the same two tickets and observe whether only one at a time passes under the gate
if so …
• Fill the column with a large known quantity of tickets and - in test mode - dispense the entire amount
4. Swapping columns
TURN OFF THE POWER
(and unplug the battery)
before performing this procedure
TURN OFF THE POWER
4. Swapping columns
The printed circuit board (PCB), which provides power and data to the four columns, must first be removed … it has five screws
4. Swapping columns
Do not misplace any of the screws or washers
4. Swapping columns
Gently pull out the PCB, paying …… particular attention to not damage the 4 five-pin connectors which plug
into the columns
4. Swapping columns
Lay the PCB down
4. Swapping columns
Using a 3/8 nut driver loosen all clamps which hold a column in place … and turn them 90 degrees [either to the left or right]
4. Swapping columns
Slide out the column
4. Swapping columns
… and clean out the paper dust. After dispensing hundreds of thousands of tickets a sizable amount can be present
4. Swapping columns
Swap in a new column and reinstall the PCB (do not tighten the clamp before reinstalling the PCB)
4. Swapping columns
… Again, pay particular attention to the 4 sets of five-pin connectors: all pins must be inserted simultaneously
4. Swapping columns
It is often necessary to nudge a column a millimeter, or so, to the left or to the right
4. Swapping columns
Insert the PCB just a millimeter and verify that each connector … … is connected into the right slot. Please re-verify the connections before pushing the PCB all the way in (especially check that no two pins are jammed into the same slot)
4. Swapping columns
• Screw in the five screws/washers • Tighten the clamps in their original position• Power on the machine• Verify that each column dispenses tickets in an
acceptable manner.
• Swapping columns is a common diagnostic test. If a problem ‘follows’ a column, then there is most likely a problem with that column
5. Column gears
If any of the gears are chipped, (not in this picture) they will need to be replaced
5. Column gears
Tools: two Allen wrenches (the larger one, 1/16” hex, is for all but the smallest gear which uses a .035” hex) and locktite (to prevent the gear from coming undone through years of usage)
5. Column gears
You will need to use a bit of force to break through the locktite that has been applied by Arrow Technicians when the column was first constructed
5. Column gears
If, using moderate force, you can pull apart the two largest gears [such that the teeth no longer make contact and you can rotate one independent of the other] the entire column
must be sent in to Arrow for repair
6. The Optical Sensor
There is a ticket under this sensor
6. The Optical Sensor
There isn’t a ticket under this sensor
6. The Optical Sensor
The PCB connecting the columns will use the green LEDs to indicate whether there is a ticket underneath a column’s optical sensor.
off = yes, there is a ticket … on = no, there is no ticket
6. The Optical Sensor
If you slide a ticket back and forth under the sensor (by manually turning the biggest gear) and the LED does not react, the sensor either needs to be cleaned, adjusted, or replaced
7. PCB layout
Power to door switch (explained later)
Main power
Data from main PCB
Battery – if one plug is disconnected the battery is out of the circuit
Power to the PCB of an 8-column machine
You may take a DC voltage reading from either of these pairs of connectors
8. DC Voltage
Optimal DC voltage is 14.2V (if higher, tickets will dispense too fast; if lower, too slow). Be careful … do not to touch the two leads together
8. DC Voltage
If the voltage ‘is off’ by more than .3V there is a variable resistor on the main PCB which can be adjusted to fine tune the machine
8. DC Voltage
TURN OFF THE POWER
(and unplug the battery)
before performing this procedure
TURN OFF THE POWER
8. DC Voltage
The main PCB on the newest Nevada Golds is located almost directly behind the LED panel (though parts of the PCB, including the variable resistor, can be reached by going up from the
validator doorway, or down from the display doorway)
8. DC Voltage
There are 4 butterfly screws holding the LED panel which need to be removed by reaching inside the machineThis is a partially removed LCD displayLet the LCD display dangle by the wires
8. DC Voltage
This is the variable resistor (looking from behind the LCD display … … and from behind the bill validator) … using whichever perspective you prefer, gently turn the resistor using a driver [while simultaneously measuring the DC voltage as previously instructed (the machine will need to be turned on)]: you will NOT feel a click when adjusting the resistor
9. Changing chips
It is necessary, on the newer Nevada Golds, to have removed the LCD display in order to change chips. The slave chip is the most frequently changed: 90% of the times when a ticket
dispersal issue is not fixed by swapping columns, it will be fixed by changing this chip
Using a chip puller, gently ease out the chip (do not attempt this without a chip puller – either in the extraction or insertion, a pin is very likely to be damaged) – make a note of
the chip’s orientation
9. Changing chips
If a new chip’s pins are sticking out, and not at 90 degrees with the body of the chip, place the chip on its side on a table and gently push it in so that the pins readjust to 90
degrees (of course, don’t push it too much)
10. Changing Door LED bulb
TURN OFF THE POWER
(and unplug the battery)
before performing this procedure
TURN OFF THE POWER
10. Changing Door LED bulb
If this goes out …Turn it clockwise and pull down (remember how it was oriented when you
pulled down – you will need to reinsert it in the same direction)Change the bulb and fasten it with some tape
If the LED bulb is not inserted correctly, the red switch will not get pressed when the user attempts to dispense a ticket
11. Adding a sign above the LED bulb
Before reinserting the LED bulb, take this time to add a sign (such as the pricing of the tickets dispensed by the column) above the LED bulb
Take out the spring. Hold with pliers and give it a quick jab down the middle to knock out the red cap … this can be rather fun; but, enjoy responsibly
12. Changing the Lexan Film
TURN OFF THE POWER
(and unplug the battery)
before performing this procedure
TURN OFF THE POWER
12. Changing the Lexan Film
The Lexan Film guides dispensed tickets so they stack correctly. After several hundred thousand are dispensed the strip can wear out. Notice the relative position of the arches of the
Lexan Film to the bar which holds the strip in place
You will need to take out all four LED bulbs and unscrew the 3 nuts of the metal bar which holds the Lexan Film in place
If the machine has a lightbar inside the ticket chamber you will also need to permanently remove the two conduits which hold the lightbar in place, and replace them with a new
pair once the Lexan Film has been replaced
Check for cracks … the tickets hit the Lexan Film at exactly the
same spot every time
13. Dealing with a defective door switch
TURN OFF THE POWER
(and unplug the battery)
before performing this procedure
TURN OFF THE POWER
13. Dealing with a defective door switch
This switch will not allow tickets to be dispensed until the ticket door is closed. It can malfunction … and never allow tickets to be dispensed at all (regardless of the position
of the door)
You may either a) send in the entire machine to Arrow for repairs, or b) unplug both of these connectors (disabling the switch)
14. Main door switch
It can be in 3 positions (middle, pushed in, pulled out) … the first two are what you get from closing and opening the door. The last, having the switch pulled out, allows a technician to operate a machine as if the door were actually closed (when in reality it is open … observe how the machine asks to insert money, even though
the door is open)
Arrow International
Please contact the Technical Assistance Center for any further technical questions about our products
1-800-277-6214
If you have any comments, or suggestions, specifically related to this presentation - or its future revisions - you can contact the Technical Writing Team directly at
Thank you !