AMS SENSIT II Operation manual

L0086, Rev. D
SENSIT II
GLASS FRONT VENDOR
OPERATION AND SERVICE MANUAL
Model AMS 39-VRM
AUTOMATED MERCHANDISING SYSTEMS
255 WEST BURR BLVD.
KEARNEYSVILLE, WV 25430
304-725-6921, Fax [phone]
INTERNATIONAL A.M.S. S DE RL DE CV
KM. 9 CARR. AL CASTILLO NO. 8200
MPIO. DE EL SALTO, JAL. MEXICO 45680
5233-36-88-07-17, Fax [phone]
www.amsvendors.com - e-mail: [email protected]

AMS SENSIT II GLASS FRONT VRM VENDOR L0086, Rev. D
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TABLE OF CONTENTS
Para Title Page
TABLE OF CONTENTS i
TABLE OF FIGURES iii
1 INTRODUCTION 1-1
1.1 SENSIT II SYSTEM 1-1
1.1.1 Guaranteed Delivery 1-1
1.1.2 Instant Refund 1-1
1.1.3 Automatic Helix Adjustment 1-1
1.1.4 Additional Benefits 1-1
1.2 MODEL IDENTIFICATION 1-1
1.2.1 Model Number Breakdown 1-1
1.2.2 Serial Number and Date
Code Breakdown 1-1
1.3 GENERAL SPECIFICATIONS 1-1
1.3.1 Operating Environment 1-1
1.3.2 Cabinet Physical Dimensions: 1-2
1.3.3 Cabinet Weight: 1-2
1.3.4 Unit Capacity: 1-2
1.3.5 Power Requirements 1-2
1.3.6 Refrigeration Specification 1-2
1.3.7 Coin Mechanisms and
Bill Validators 1-2
1.4 HELIX CONFIGURATIONS 1-3
2 SAFETY 2-1
2.1 COMMITMENT TO SAFETY 2-1
2.2 SAFETY PRECAUTIONS 2-1
2.2.1 High Voltage Contact 2-1
2.2.2 Improper Grounding 2-1
2.2.3 Fan Contact 2-1
2.2.4 Helix Motion and Jamming 2-1
2.2.5 Refrigerant Release 2-1
2.2.6 Vendor Tipping 2-2
2.2.7 Other Improper Conditions 2-2
2.3 TEST STANDARDS 2-2
3 VENDOR SYSTEMS/COMPONENTS 3-1
3.1 SENSIT II SYSTEM THEORY
OF OPERATION 3-1
3.2 CONTROL BOARD 3-1
3.2.1 Program Chip 3-1
3.2.2 Mode Switch 3-1
3.2.3 DEX Jack 3-1
3.3 VEND SENSOR 3-1
3.3.1 Emitter 3-1
3.3.2 Detector 3-1
3.4 DOOR 3-1
3.4.1 Changer Location 3-1
3.4.2 Validator and Debit Card
Reader Locations 3-1
3.4.3 Coin Box 3-2
3.4.4 Door Switch 3-2
3.4.5 Display 3-2
3.4.6 Keypad 3-2
3.4.7 Coin Return Button 3-2
3.5 REFRIGERATION (CHILLER)
SYSTEM 3-2
3.5.1 Refrigeration Cycle Theory of Operation 3-2
3.5.2 Temperature Control 3-2
3.5.3 Refrigeration Controls 3-2
3.6 TRAY RAILS 3-2
3.7 TRAYS 3-2
3.7.1 Vend Motors 3-2
3.7.2 Helixes 3-2
3.7.3 Divider 3-3
3.7.4 Candy Pusher Bar 3-3
3.8 ELECTRICAL PANEL 3-3
3.8.1 Fuse Holder 3-3
3.8.2 Transformer 3-3
3.8.3 RF Filter 3-3
3.8.4 Relay 3-3
3.8.5 Ballast 3-3
3.8.6 Power Distribution Harness 3-3
3.8.7 Ground 3-3
3.9 1.5” HELIX TRAY (OPTIONAL) 3-3
4 VENDOR PREPARATION AND
INSTALLATION 4-1
4.1 CONFIRMING POWER
AT OUTLET 4-1
4.1.1 Checking the Outlet
(US & Canada) 4-1
4.1.2 Checking the Outlet
(Outside US & Canada) 4-1
4.1.3 Electrical Requirements
for CE Compliance 4-1
4.1.4 Requerimiento de Servicio
Eléctrico para Certificación CE 4-1
4.1.5 Les Utilites Electriques
Necessaire Pour Conformement
Aux Regles CE 4-1
4.2 VENDOR PREPARATION 4-2
4.2.1 Inspection 4-2
4.2.2 Mounting and Connecting Coin Mechanism 4-3
4.2.3 Mounting and Connecting Bill
Validators and Card Readers 4-2
4.2.4 Test Loading and Configuration 4-2
4.2.5 Configuring Motors 4-2
4.2.6 Installing Price Labels 4-3
4.2.7 Setting Prices 4-3
4.3 ON-SITE INSTALLATION 4-5
4.3.1 Remove Shipping Boards 4-3
4.3.2 Placing the Vendor in Location 4-3
4.3.3 Leveling the Vendor 4-3
4.3.4 False Leg Installation 4-3
4.3.5 Initial Power-Up and Cool-down 4-4
5 TRAY ADJUSTMENT AND
CONFIGURATION 5-1
5.1 SNACK AND CANDY TRAY 5-1
5.1.1 Removal 5-1
5.1.2 Installation 5-1
5.2 BOTTLE TRAY 5-1
5.2.1 Removal 5-1
5.2.2 Installation 5-1

L0086, Rev. D AMS SENSIT II GLASS FRONT VRM VENDOR
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5.3 TRAY VERTICAL POSITIONS 5-1
5.3.1 Removal 5-1
5.3.2 Installation 5-1
5.4 TRAY COLUMN POSITIONS 5-2
5.5 CHANGING DIVIDERS 5-2
5.6 SNACK AND CANDY HELIXES 5-2
5.7 HELIX ADAPTER 5-2
5.8 HELIX EJECTOR 5-2
5.9 HELIX ALIGNMENT DEVICE 5-2
5.10 MOTOR POSITIONS 5-2
5.11 BOTTLE ALIGNMENT DEVICE 5-3
5.12 BOTTLE TIPPER BAR 5-3
5.13 AVOIDING PRODUCT HANG-UPS 5-3
5.14 TALL PRODUCT VENDING 5-3
5.15 CANDY PUSHER BAR INSTALLATION 5-3
5.16 1.5” HELIX TRAY 5-3
5.16.1 General Information 5-3
5.16.2 Tray Adjustment and Loading 5-3
6 SERVICE PROGRAMMING 6-1
SERVICE MODE 6-1
6.1 ERROR CODES 6-1
6.2 ACCOUNTING DATA 6-1
6.3 FILL/DISPENSE 6-1
6.4 DELAYED SALES 6-1
6.5 TEMPERATURE 6-1
6.6 PRICE SETTINGS 6-2
6.6.1 Set Prices 6-2
6.6.2 ValueVend 6-2
6.7 TRAY SETUP 6-2
6.7.1 Test Motors 6-2
6.7.2 Link Motors 6-2
6.7.3 Home Switch 6-2
6.7.4 Delayed Stop 6-3
6.7.5 Number 6-3
6.7.6 Configure 6-3
6.8 MDB (MULTI-DROP BUS) SETTINGS 6-3
6.8.1 Force Vend 6-3
6.8.2 No Cheat 6-3
6.8.3 Change Bill 6-3
6.8.4 Hold Lost Credit 6-3
6.8.5 Multi-Vend 6-3
6.8.6 Lev2 Coin Mech 6-3
6.9 OPTIONS 6-3
6.9.1 Message 6-3
6.9.2 Prize 6-3
6.9.3 Language 6-4
6.9.3.1 Primary 6-4
6.9.3.2 Secondary 6-4
6.9.3.3 Create Custom 6-4
6.9.4 Product Sensor 6-4
6.9.5 Speech 6-4
6.10 SALES BLOCKING 6-4
6.11 CLOCK SETTINGS 6-4
6.12 FREE VEND 6-4
6.13 AUXILIARY OUTPUT 6-4
6.14 DATA LOGS 6-4
6.15 ENERGYSENSIT 6-5
6.15.1 Enable 6-5
6.15 2 Clear History 6-5
6.15.3 Set Temp Chg 6-5
6.15 4 Set Patt Time 6-5
6.15.5 Set Hist Fact 6-5
6.15.6 Set Del 6-5
6.15.7 Lighting 6-5
7 TROUBLESHOOTING 7-1
7.1 OUT OF SERVICE ERRORS 7-1
7.2 MACHINE ERROR CODES: CAUSES
AND SOLUTIONS 7-1
7.2.1 VIEWING TOP LEVEL ERROR CODES 7-1
7.2.2 VIEWING SUB-LEVEL ERROR CODES 7-1
7.2.3 ERROR CODE CAUSES
AND SOLUTIONS 7-1
7.3 CLEARING JAMMED MOTOR 7-2
7.4 WATER ACCUMULATION
IN THE CABINET 7-2
7.5 MACHINE TROUBLESHOOTING CHART 7-3
8 MAINTENANCE 8-1
8.1 REPLACING THE PROGRAM CHIP 8-1
8.2 CLEANING THE REFRIGERATION UNIT 8-1
8.3 CLEANING THE VENDOR CABINET 8-2
8.4 CLEANING THE PLASTIC DOOR LINER 8-2
8.5 CLEANING THE WINDOW AND
WINDOW COVER 8-2
8.6 LUBRICATION WITH LITHIUM GREASE 8-2
8.7 REPLACING FLOURESCENT BULBS 8-2
8.8 DEFROSTING THE EVAPORATOR COIL 8-2
8.9 TESTING THE TEMPERATURE SENSOR 8-3
8.10 SOFTWARE LOADING INSTRUCTIONS 8-3
8.10.1 Requirements 8-3
8.10.2 Installation 8-3
8.10.3 Startup 8-3
8.10.4 Toolbar 8-3
8.10.5 Program Screens 8-3
8.10.6 Software Operation 8-4
8.10.7 Shutdown 8-4
8.10.8 Errors 8-5
9 WIRING DIAGRAM 9-1
10 SUPPORTED DEX FIELDS 10-1
11 OPTIONAL EQUIPMENT 11-1
12 WARRANTY 12-1

AMS SENSIT II GLASS FRONT VRM VENDOR L0086, Rev. D
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TABLE OF FIGURES
Figure 1.1 Vendor Serial Plate 1-1
Figure 1.2 AMS 39-VRM Cabinet Dimensions 1-3
Figure 3.1 Control Board Components 3-1
Figure 4.1 Tip-Over Warning 4-3
Figure 4.2 False Leg Installation 4-4
Figure 5.1 Bottle Tray Rails 5-1
Figure 5.2 Large Bag Vending 5-3
Figure 5.3 Pusher Bar Installation 5-3
Figure 5.4 1.5” Helix Tray 5-3
Figure 8.1 Replacing Control Chip 8-1
Figure 8.2 Refrigeration Unit Housing 8-1
Figure 8.3 Temperature Sensor 8-3
Figure 8.4 Harness, Chip Programming 8-5
Figure 9.1 Typical Wiring Diagram
(Sheets 1 – 4) 9-1
PUBLICATION NOTICE
L0086D, ECN 1564, 08/18/2005
It is our intent to assist our customers with up-to-date
documentation: however, this manual may not contain all updates
and is subject to revision without notice. Please contact our
Service Department with your requests or comments.

L0086, Rev. D AMS SENSIT II GLASS FRONT VRM VENDOR
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AMS SENSIT II GLASS FRONT VRM VENDOR L0086, Rev. D
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1.0 INTRODUCTION
Congratulations on the purchase of your new AMS
Sensit II 39-VRM vendor. The VRM Snack and Visi-Combo
Vendors are versatile, high-capacity vending machines.
The VRM vendor is designed, tested, and built to provide
years of reliable, low-maintenance service in both indoor
and outdoor environments. A fully insulated cabinet, DEX
data capability, and flexible product configuration are just
some of the many standard features built into every AMS
merchandiser.
1.1 SENSIT II SYSTEM
Your vendor is equipped with the Sensit II system. The
Sensit II system is a patented vend-sensing system that
detects when products fall into the delivery bin. Basically, a
plane of infra-red light beams is created across the top of
the delivery bin, and the Sensit II system can detect when
any part of the light has been blocked by a passing product.
Using this technology, the vendor “knows” when your
customer gets the product. The Sensit II system has
several important benefits:
1.1.1 Guaranteed Delivery
If, after one revolution, the product hangs up or an
opening was missed in loading, the helix will rotate three
additional half-revolutions to make sure the product is
delivered. No more hitting or shaking the vendor to get
products that did not fall!
1.1.2 Instant Refund
If the customer does not receive a product, he can
receive a full refund by pressing the coin return, or he can
select another product. No more refund requests!
1.1.3 Automatic Helix Adjustment
With the Sensit II system, the helix stops as soon as
the product falls. It is no longer necessary to adjust the
home position of the helix for each different package. In
fact, different packages can be loaded in the same column.
No more double vending!
1.1.4 Additional Benefits:
1. Opening the delivery bin door will not affect the Sensit II
system. The sensors are located above the delivery bin
and will not be blocked by the door. Product that falls
while the door is open will still pass through the beam.
2. Shining a light at the detector will not allow vandals to
receive free product. Any tampering which changes the
precise amount of light normally received will be treated
as a successful vend, resulting in the vandal losing his
money.
3. Disabling or blocking the sensor will not allow vandals to
receive free product. The Sensit II system must be
receiving the normal amount of light before the vendor
will dispense any product.
4. Opening the door of a cold vendor will cause some
condensation to form inside. The Sensit II system will not
allow vending until this fogging clears, normally within a
few minutes of closing the door.
1.2 MODEL IDENTIFICATION
When requesting service, replacement parts or
technical assistance, please refer to the Vendor Serial
Plate (as show in Figure 1.1, Vendor Serial Plate). The
plate is located on the inside of the upper left or right of the
window, or on the outside of the door on the lock side. The
information contained on this plate is necessary to
determine what parts, kits, or maintenance should be
applied to your specific model.
Figure 1.1 Vendor Serial Plate
1.2.1 Model Number Breakdown (refer to Figure 1.1)
AMS 39 - VRM
Manufacturer Cabinet Width Type
1.2.2 Serial Number and Date Code Breakdown (refer to
Figure 1.1)
Sequential Production Number Production
Run Number
1203 - 1010 - B 2
Quarter (ABCD) Year
Example: 1203-1010-B 2 would be translated as
sequence number 1203 of production run 1010,
manufactured in the second quarter (B) of 2005.
The Production Run Number of machines built in the
U.S. starts with the number 1 or any odd number. The
Sequential Production Number of machines built in Mexico
starts with the number 0 or any even number.
1.3 GENERAL SPECIFICATIONS
1.3.1 Operating Environment
The AMS Model 39-VRM Vendor is designed for
indoor or outdoor use.

L0086, Rev. D AMS SENSIT II GLASS FRONT VRM VENDOR
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1.3.2 Cabinet Physical Dimensions: Model 39 (refer to
Figure 1.2)
39”W x 72”H x 36”D (99 cm x 183 cm x 91 cm)
1.3.3 Cabinet Weight: Model 39
Approx. 750 lbs. (340 kg)
1.3.4 Unit Capacity: Model 39 (See Standard Helix
Configuration, Section 1.5)
1440 units max. / 150 units min. (depending on helix
configuration)
1.3.5 Power Requirements
United States,
Canada and Mexico: 115 VAC, 60 Hz
International: 230 VAC, 50/60 Hz
Basic Unit: 3 amps @ 115 VAC (345 watts)
1.6 amps @ 220 VAC (345 watts)
Refrigerated Snack: 7 amps @ 115 VAC (805 watts)
3.7 amps @ 220 VAC (805 watts)
Visi-Combo: 10.8 amps @ 115 VAC (1242 watts)
5.6 amps @ 220 VAC (1242 watts)
1.3.6 Refrigeration Specification
½ HP, R-134a, 8.5 oz. (.24 kg)
1.3.7 Coin Mechanisms and Bill Validators
AMS vendors will support all NAMA-approved Multi-
Drop Bus (MDB) coin mechanisms, bill validators and card
readers. Where applicable, it will also support the
“Executive Mechanism” Coin Changer.

AMS SENSIT II GLASS FRONT VRM VENDOR L0086, Rev. D
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Figure 1.2 AMS 39-VRM Cabinet Dimensions (Inches[mm])

L0086, Rev. D AMS SENSIT II GLASS FRONT VRM VENDOR
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1.4 HELIX CONFIGURATIONS
10 10 15 15 15
12 12 12 12 12
15 15 15 15 15 18 18 18 18 18
6 6 6 6 6 6 6 6
6 6 6 6 6 6 6 6
Model 39
386 UNITS
A
vailable Helix Sizes:
2 ½ Inch
(
63mm
)
20120-07 7 Pitch, 2 5/8”
(
66mm
)
O
p
enin
g
20120-10 10 Pitch, 1 7
/
8”
(
47mm
)
O
p
enin
g
20120-12 12 Pitch, 1 5/8”
(
41mm
)
O
p
enin
g
20120-15 15 Pitch, 1 1/4”
(
31mm
)
O
p
enin
g
20120-18 18 Pitch, 1”
(
25mm
)
O
p
enin
g
20120-24 24 Pitch, 3/4”
(
19mm
)
O
p
enin
g
3 Inch
(
76mm
)
21336
6 Pitch, 3 1/2” (88mm) Opening
(
Bottle Tra
y
s Onl
y)
4 Inch
(
102mm
)
21465-05 5 Pitch, 3 1/4”
(
82mm
)
O
p
enin
g
21465-07 7 Pitch, 2 1/2”
(
63mm
)
O
p
enin
g
21465-09 9 Pitch, 2”
(
50mm
)
O
p
enin
g
21465-10 10 Pitch, 1 3/4”
(
44mm
)
O
p
enin
g
21465-12 12 Pitch, 1 1/2”
(
38mm
)
O
p
enin
g
21165-15 15 Pitch, 1 1/4”
(
31mm
)
O
p
enin
g
1.5 Patent Disclosure
This vendor and/or certain of its components are covered by one or more of the following
U.S. and International patents:
U.S. patents: 6,041,962; 6,145,699; 6,202,888; 6,384,402; 6,794,634
Canadian patent 2,329,314

AMS SENSIT II GLASS FRONT VRM VENDOR L0086, Rev. D
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2.0 SAFETY
2.1 COMMITMENT TO SAFETY
Automated Merchandising Systems Inc. is
committed to designing and producing a safe product. As
with all electrical or mechanical pieces of equipment,
potential hazards exist. It is the intent of Automated
Merchandising Systems, through this manual and service
technician training, to alert individuals who will be servicing
our equipment to these potential hazards, and to provide
basic safety guidelines.
To reduce the risk of serious injury or death, please
read and follow all warnings in this manual. It is important
that we point out that these warnings are not
comprehensive. Automated Merchandising Systems can
not possibly anticipate all of the ways that service may be
conducted, nor all of the possible safety hazards that may
result from service. Therefore at all times we urge you to
beware of hazards such as electrical shock, mechanical
entrapment, and tipping a vendor during movement.
Automated Merchandising Systems strongly
recommends a commitment to safety on the part of all
servicing personnel or organizations. Only personnel
properly trained in vendor servicing should attempt any
service to the internal components of the vendor. It is
important to point out that Automated Merchandising
Systems has no control over the vendor once it leaves our
factory. Maintaining the vendor in a safe condition is
the sole responsibility of the owner.
If you have questions concerning safety or service,
or would like more information, please contact the
Automated Merchandising Systems Service Department at
304-725-6921 or e-mail [email protected].
2.2 SAFETY PRECAUTIONS
Below are listed safety precautions and safe
practices to follow to avoid injury from selected hazards.
This list can not possibly cover all hazards, therefore please
remember to THINK SAFETY FIRST.
2.2.1 High Voltage Contact
Each vendor is designed to operate on a specific
voltage, either single phase 115VAC 60Hz or 220-240VAC
50-60Hz, depending on the country. The voltage is
specified on the serial plate (refer to Section 1.2 Model
Identification). High voltage areas include the electrical
panel, the refrigeration unit and fans, and the fluorescent
lamp. It is important to understand that contact with the
high voltage wiring can result in injury or death.
1. Always test the outlet for proper voltage, polarity and
grounding before plugging in the vendor.
2. Always disconnect power to the vendor before
servicing. Allow only fully trained service technicians
to service the vendor if service must be performed
with the power on.
3. Always keep electrical connections dry. Do not place
the vendor in or near standing water.
4. Never use a worn or damaged power cord.
2.2.2 Improper Grounding
Some electrical components have a green or
green/yellow ground wire attached to a grounding point in
the vendor. If it becomes necessary to remove a ground
wire during service, note how the wire is attached, including
the locations of any washers. After servicing, make sure
that the wires and washers are replaced exactly as they
were. Note that the vendor will work normally without the
ground wires, but there will be a potential shock hazard
from ungrounded components.
1. Always test the outlet for proper grounding before
plugging in the vendor.
2. Always reconnect ground wires after servicing.
2.2.3 Fan Contact
Vendors are equipped with electric fans which can
start automatically. These fans are guarded to prevent
accidental contact. However, removal of guards or other
components can leave fan blades exposed and create a
physical hazard.
1. Always disconnect power to the vendor before
servicing.
2. Always keep protective covers in place.
3. Always wear hand and eye protection when servicing
the vendor.
4. Always keep hands, hair, loose clothing and tools away
from fan blades.
5. Never insert hands or tools into concealed areas.
6. Always replace protective covers after service.
2.2.4 Helix Motion and Jamming
Energized vend motors can turn a helix with
considerable torque, creating a possible entrapment
hazard. Also, turning helixes may eject tools or other
objects left on trays. A helix that is jammed or caught can
store energy as it binds, which can cause it to twist or
spring outward suddenly even if power is disconnected.
Use caution when freeing a jammed helix.
1. Always disconnect power to the vendor or control
board before servicing the vend motors.
2. Always check for proper fit when loading products in
helixes to avoid jamming.
3. Always restrain the helix before freeing a jammed or
caught helix.
4. Always wear hand and eye protection when servicing
the vendor.
5. Always keep hands, hair, loose clothing and tools away
from moving parts.
2.2.5 Refrigerant Release
The refrigeration system is pressurized and sealed
at the factory. Puncturing or cutting any component in the
system will cause refrigerant gas and liquid to be propelled
out of the system, creating an immediate physical hazard.
Use caution to avoid accidentally opening the refrigerant
system.
It should also be noted that releasing refrigerant to
the atmosphere is a federal crime and is punishable by law.
Any service work requiring the system to be opened must
be performed by a licensed technician using certified
equipment. Unauthorized service to the

L0086, Rev. D AMS SENSIT II GLASS FRONT VRM VENDOR
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sealed refrigerant system may void the warranty.
1. Never puncture or cut any component in the
refrigeration system.
2. Always use licensed service technicians to service the
refrigeration system.
3. Always wear hand and eye protection when servicing
the vendor.
2.2.6 Vendor Tipping
The empty weight of the vendor is approximately
750 pounds (340 kg). A falling vendor can cause serious
injury or death. Caution should always be taken to avoid
dropping or tipping a vendor.
1. Never rock or tip the vendor. It must be kept horizontal
for safe operation.
2. Never place the vendor in an inclined position, such as
on a ramp or with all the legs not on the same
horizontal surface.
3. Never place the vendor in a moving environment such
as on a ship without properly securing it in place.
4. Never place the vendor in a location where it may be
struck by a vehicle.
5. Never transport an unsecured vendor.
6. Never attempt to lift or move the vendor by hand.
Always use equipment with the proper load rating.
Note that the Specification weight listed is empty
weight.
2.2.7 Other Improper Conditions
Hazardous conditions can be created by improper
use or service of the vendor.
WARNING: Do not use electrical appliances inside the
vendor unless recommended by AMS.
1. Always reinstall any parts removed during service to
their original locations.
2. Never make unauthorized modifications to any part of
the vendor.
3. Always replace components that are worn, broken, or
otherwise unfit for use.
4. Never use unauthorized parts, or use parts for anything
other than their intended application.
5.
2.3 TEST STANDARDS
AMS vending machines bearing the ETL mark have
been tested for compliance with one of the following
standards:
2.3.1 Standard for Refrigerated Vending Machines
(ANSI/UL 541, 6th Edition, 10/30/03) and the
Standard for Refrigeration Equipment (CAN/CSA
C22.2 No. 120, 3rd Edition.
2.3.2 Standard for Safety for Vending Machines (ANSI/UL
751 6th Edition, 10/3/03 and the Standard for Vending
Machines, Consumer and Commercial Products
(CAN/CSA C22.2 No. 128-95

AMS SENSIT II GLASS FRONT VRM VENDOR L0086, Rev. D
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3.0 VENDOR SYSTEMS AND COMPONENTS
3.1 SENSIT II SYSTEM THEORY OF OPERATION
1. The Sensit II system is comprised of three elements;
the emitter, the detector, and the control logic. The
emitter is a circuit board with infra-red emitting LED’s
located on one side of the hopper. On the opposite
side of the hopper is a circuit board with infra-red
detectors that measure the intensity of the light. The
emitter, the detector and the control board controls
the performance of the vending operation.
2. When a selection is made, the vend motor will begin
to run. After several seconds, if no product falls in the
hopper, the motor will be stopped, the credit will be
maintained and the customer will be directed to
“PLEASE MAKE ANOTHER SELECTION.”
3. When the controller measures a variation in the light
intensity during the vend cycle, it recognizes that a
product has fallen through the light into the hopper.
The controller stops the vend motor and removes the
credit.
4. When the vendor is serviced with the door open, the
protective lens on the detector can become fogged
up, particularly in hot or humid locations. In these
cases, the vendor will display “SENSIT BLOCKED –
UNABLE TO VEND” until the fogging has cleared,
usually within a minute after closing the door.
3.2 CONTROL BOARD
The control board contains a program chip which
controls and monitors the vendor, DEX, and the mode
switch used to enter service mode. The control board is
located in the upper left hand corner of the open vendor
door, behind an access door.
3.2.1 Program Chip
The program chip contains the software that controls
vending and refrigeration (refer to Figure 3.1). The
software can be upgraded by replacing the chip, but
please note that all settings such as pricing and motor
configuration will have to be reprogrammed. Refer to
Section 8.1 for replacing the control chip.
3.2.2 Mode Switch
Pressing the mode switch (refer to Figure 3.1) allows
the user to get in to the computer’s service mode to
change settings, access vend data, and check error codes
for troubleshooting. Data is displayed on the front display
panel, and entered at the front selection panel. Pressing
the switch again or closing the door will automatically
switch the computer back to vend mode.
3.2.3 DEX Jack
The DEX jack (refer to Figure 3.1) is provided for
downloading detailed vend data, and uploading control
chip software.
Figure 3.1 Control Board Components
3.3 VEND SENSOR
3.3.1 Emitter
The emitter, inside a protective housing, is located on
the right side of the hopper when viewing the back of the
door. The emitter sends a beam of infra-red light across
the top of the hopper to the detector.
3.3.2 Detector
The detector is located on the left of the hopper when
viewing the back of the door. The detector, inside a
protective housing, receives the beam of light from the
emitter and sends a signal to the control board based on
the intensity of the beam. When a product drops through
the beam, it causes a change in intensity which is
interpreted by the control as a successful vend. When
servicing the detector board, be mindful of the seven black
detector cells along the top of the board. These can be
knocked out of alignment or damaged by rough handling.
3.4 DOOR
3.4.1 Changer Location
Three screws are installed in the door below the coin
chute. These screws mate to the keyhole slots on the
back of the changer. Refer to Section 4.2.2 Mounting And
Connecting Coin Mechanism.
3.4.2 Validator & Debit Card Reader Locations
There are two locations that will accept bill validators
and debit card readers The lower position meets the
guidelines of the Americans with Disabilities Act (ADA) for
access by handicapped persons. Refer to Section 4.2.3
Mounting and Connecting Bill Validators and Card
Readers
3.4.3 Coin Box

L0086, Rev. D AMS SENSIT II GLASS FRONT VRM VENDOR
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The coin box is located below the changer, behind a
separate door, and is used to hold overflow coins when the
changer is full. It is removed by tilting slightly and pulling.
3.4.4 Door Switch
The door switch is mounted on the back of the door.
The control uses the door switch to turn off the
refrigeration unit when the door is open, and to switch from
service mode to vend mode when the door is closed.
3.4.5 Display
The display is located on the front of the door. It
serves as the interface for using and programming the
machine. It will display the price of a selected item and the
credit accumulated. When the machine is idle, it can
display the time and a scrolling message. In service
mode, it displays the active function and parameter values.
3.4.6 Keypad
The keypad is located below the display on the front
of the door. A vending selection is made by keying in the
number combination that corresponds to the location of an
item in the machine. The keypad is also used to enter
data in operation and servicing of the vendor.
3.4.7 Coin Return Button
The coin return button is located next to the coin slot.
Pressing the coin return button will release bent or
irregular coins that are not accepted by the changer. If the
machine fails to vend a selection that has been made,
pressing the coin return will return the full credit. If the
Force Vend option is disabled, it can also return the full
credit before a selection is made. If the Bill Changer option
is enabled, the coin return will return change for bills
inserted in the bill validator.
3.5 REFRIGERATION (CHILLER) SYSTEM
3.5.1 Refrigeration Cycle Theory of Operation
The compressor compresses refrigerant gas, which
increases the pressure and temperature of the gas. As
the hot, compressed gas passes through the condenser, it
is cooled by the condenser fan and condenses to a liquid.
The fan draws outside air in through a hole in the bottom
of the cabinet, across the condenser where it picks up
heat, and exhausts through the back of the cabinet. This
part of the refrigeration system is isolated from the
refrigerated part of the cabinet by the chiller housing.
Driven by the pressurized gas entering the condenser, the
liquid passes through a desiccant dryer and a capillary
tube, then travels into the refrigerated part of the cabinet.
The restriction created by the long, narrow capillary tube
controls the rate at which the liquid refrigerant enters the
evaporator. Lower pressures in the evaporator allow the
liquid to evaporate, which lowers its temperature. The
evaporator fan forces air across the evaporator, where it is
cooled by transferring heat to the refrigerant. The
warmed gaseous refrigerant is then sucked through an
accumulator, which traps any liquid refrigerant and allows
it to evaporate before entering the compressor. The
refrigerant is then sucked into the compressor to be
compressed, completing the cycle.
3.5.2 Temperature Control
The evaporator fan runs continuously to circulate air
within the cabinet. A temperature sensor located near the
evaporator measures the temperature of air entering the
evaporator. When this temperature is above the
temperature setting in the control, the compressor and
condenser fan are turned on.
When the temperature falls to 3°F below the
temperature setting, the compressor and condenser fan
are turned off. Refer to Section 6.5 for setting the
temperature.
3.5.3 Refrigeration Controls
1. The refrigeration system is operated through the
control board. A temperature sensor in the cabinet
relays the current temperature to the control.
2. If the temperature is above the setting that has been
programmed in by the user, the control sends a
24VDC signal to the refrigeration relay. The
energized relay closes to complete the high voltage
circuit that powers the compressor and the condenser
fan.
3. If the compressor should overheat, a thermal overload
removes power to the compressor until it has cooled.
4. To protect against evaporator freeze-up, after one
hour of continuous running the compressor will be
shut off for 7.5 minutes to allow for defrosting
5. When the temperature in the cabinet reaches 3°F
cooler than the temperature setting, the control de-
energizes the relay breaking the circuit powering the
compressor.
6. The control will also shut off the compressor if the
door is opened. This is to prevent the refrigeration
unit from freezing up.
7. After the compressor has shut down, the control will
wait until the compressor has been shut down 3
minutes and if applicable, the door has been closed
10 seconds before restarting the compressor. The
delay allows pressure in the system to equalize.
3.6 TRAY RAILS
The rails are located inside the cabinet and are used
to support the trays. The rails are adjustable up and down
in 1” increments. Refer to Section 5.3 Tray Vertical
Positions.
3.7 TRAYS
3.7.1 Vend Motors
The vend motors are snapped into mounting holes on
the back of each tray. Each column has one vend motor
which is driven by 24 VDC from the control board. Motors
do not have a conventional home position switch which
would normally stop the motor after a 360° rotation.
Instead, they will stop when the sensor has detected a
vend, whether the rotation has been more or less than
360°. Refer to Section 4.2.5 and Section 5.11.
3.7.2 Helixes
There are typically three sizes of helixes in a vendor,
approximately 2 5/8”, 3”, and 4” in diameter. There are
several pitches available in each size. The pitch is
determined by counting the number of product openings in
the helix. Refer to Section 1.4 Helix Configurations and
also in Section 5.0.

AMS SENSIT II GLASS FRONT VRM VENDOR L0086, Rev. D
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3.7.3 Divider
The divider separates product columns on the tray.
Two horizontal slots in the divider allow for the installation
of a candy pusher. To remove the divider, push rearward
and lift. To install, insert the rear tab in the desired slot,
push rearward and then down. Make sure the locking tabs
on the bottom have engaged their respective slots and pull
forward.
3.7.4 Candy Pusher Bar
The candy pusher bar keeps candies pushed to one
side of the column. This is typically used with tall candy
bars. The candy pusher bar is removed by pulling the bar
free from the plastic clips. To reinstall, it is easiest to
press the bar into the clip using pliers. Refer to Section
5.16 Pusher Bar Installation.
3.8 ELECTRICAL PANEL
The electrical panel is located in the recess formed by
the right rail mount on the right side of the cabinet, behind
an access panel.
3.8.1 Fuse Holder
The fuse holder is located on the outside of the right
rail mount near the refrigeration unit power outlet. It
contains a 3 amp fast-blow fuse to protect the 24 VAC
power supply to the control board. A spare fuse is located
in the front of the fuse holder. The fuse holder is opened
by pressing on the indicated side and pulling.
The fuse holder can be used to disconnect power to
the control board when MDB devices are being connected
or disconnected, when the board is being serviced, or
before any wiring harness is connected or disconnected.
3.8.2 Transformer
The transformer reduces the input voltage to 24 volts
AC for the control board.
3.8.3 RF Filter
The filter removes electrical noise from the power
supplied to the 24VAC transformer to prevent interference
with operation of the control board and software.
3.8.4 Relay
The relay uses a 24 VDC signal from the control
board to close the relay and supply power to the
refrigeration unit.
3.8.5 Ballast
The ballast provides the necessary power to the
fluorescent lamp in the door.
3.8.6 Power Distribution Harness
The power distribution harness splits the incoming
power into individual leads for the high voltage
components.
3.8.7 Ground
Two grounding studs are located inside the right rail
mount column, behind the electrical panel cover. The left
stud is used to attach the earth ground from the outlet.
The right stud is the attachment point for the individual
ground wires from the high voltage components.
3.9 1.5” HELIX TRAY (OPTIONAL)
The 1.5” Helix Tray is mounted below the bottom
snack tray. To load the tray with small products such as
gum and mints, grasp the tray and pull forward to unsnap
the catches. After loading, push the tray to the rear until
the catches snap in place.
The motors in the 1.5” Helix Tray operate in the same
way as snack or bottle tray motors and do not have a
home position switch. Refer to Section 3.7.1. Vend Motors.

L0086, Rev. D AMS SENSIT II GLASS FRONT VRM VENDOR
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AMS SENSIT II GLASS FRONT VRM VENDOR L0086, Rev. D
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4.0 VENDOR PREPARATION AND INSTALLATION
Setting up a vendor has been divided into three
stages. Step 4.1 confirms power availability. Step 4.2 is
accomplished in the customer’s shop. Step 4.3 is
accomplished on-site, where the vendor is to be located.
4.1 CONFIRMING POWER AT OUTLET
4.1.1 Checking the Outlet (US and Canada)
Using a volt meter set to AC VOLTS, check the
voltage between the positive (smaller) lug entry and the
ground lug entry (or center screw on two-lug outlets). The
reading should be between 103 volts and 126 volts.
Next, check the voltage between the negative (larger) lug
entry and the ground. The reading should be 0 volts. If
your results vary, contact a qualified electrician to correct
the outlet wiring before plugging in the vendor. Abnormal
voltage, reversed polarity or improper grounding may
cause the vendor to malfunction or create hazardous
conditions in the vendor, resulting in possible injury,
damage to the vendor, or fire. Never use an extension
cord with the vendor.
The power cord is shipped in the hopper on the
inside of the door. The cord is supplied with a standard
NEMA 3-wire plug. If there are no 3-wire outlets available
for powering the vendor, a grounding adapter may be used
to convert a 2-wire outlet to accept the 3-wire plug. The
adapter must have a ground tab or wire which must be
fastened to the center screw of the outlet.
4.1.2 Checking the Outlet (Outside the US / Canada)
Consult a qualified electrician to check the outlet for
proper polarity, voltage, and grounding. Check the serial
plate on the side of the door to confirm the vendor is rated
for the outlet voltage.
4.1.3 Electrical Service Requirement for CE
Compliance
The following requirement applies only to models
using ½ HP compressors and displaying the CE mark on
the serial plate. If this requirement applies to your vendor,
you will see a similarly worded decal on the back of the
vendor near the power cord.
This requirement does not apply to any vendor
using 120V service.
ELECTRICAL SERVICE REQUIREMENT FOR CE
COMPLIANCE:
THIS EQUIPMENT IS INTENDED FOR USE ONLY
IN PREMISES HAVING A SERVICE CURRENT
CAPACITY OF AT LEAST 100A PER PHASE,
SUPPLIED FROM A DISTRIBUTION NETWORK
HAVING A NOMINAL VOLTAGE OF 400/230V. THE
USER SHOULD DETERMINE IN CONSULTATION WITH
THE SUPPLY AUTHORITY, IF NECESSARY, THAT THE
SERVICE CURRENT CAPACITY AT THE INTERFACE
POINT IS SUFFICIENT FOR THIS EQUIPMENT.
4.1.4 Requerimiento de Servicio Eléctrico para
Certificación CE
El siguiente requerimiento se aplica solamente a
los modelo utilicen compresores de ½ HP y que muestren
la marca CE en la placa de serie. Si este requerimiento se
aplica a su dispensadora, verá una calcomanía con una
terminología parecida en la parte posterior de la
dispensadora, cerca del cordón de corriente.
Este requerimiento no se aplica a dispensadoras
que utilizan un servicio de 120V.
REQUERIMIENTO DE SERVICIO ELECTRICO PARA
CERTIFICACION CE:
ESTE EQUIPO SE PUEDE UTILIZAR
SOLAMENTE EN ESTABLECIMIENTOS QUE
CONTENGAN UNA CAPACIDAD DE CORRIENTE DE
SERVICIO DE POR LO MENOS 100A POR FASE, Y
SUMINISTRADOS POR UNA RED DE DISTRIBUCION
QUE CONTENGA UN VOLTAJE NOMINAL DE
400/230V. EL USUARIO DEBERA CONSULTAR CON
UNA AUTORIDAD DE SUMINISTRO, SI ES
NECESARIO, PARA VERIFICAR QUE LA CAPACIDAD
DE CORRIENTE DE SERVICIO EN EL PUNTO DE
INTERFASE ES SUFICIENTE PARA ESTE EQUIPO.
4.1.5 Les Utilites Electriques Necessaire Pour
Conformement Aux Regles CE
Le suivant condition applique seulement à modèle
en utilisant ½ HP compresseur et montrer le CE sur l'en
série plaque. Si cette condition s'applique à votre vendeur,
vous verrez un decal de même exprimé sur le dos du
vendeur près du cordon d'alimentation.
Cette condition ne s'applique pas au service de
120V d'utilisation de vendeur.
LES UTILITES ELECTRIQUES NECESSAIRE POUR
CONFORMEMENT
AUX REGLES CE:
CET EQUIPEMENT NE DOIT UTILISER QUE SUR
LES LIEUX AVEC UNE CAPACITE DU COURANT AU
MOINS 100A LA PHASE, FOURNIE A UN RESEAU DE
DISTRIBUTION AVEC UN VOLTAGE NOMINAL DE
400/230V. LA PERSONNE QUI SE DETERMINER
PENDANT UNE CONSULTATION AVEC
L’ADMINISTRATION DU SECTEUR, S’IL FAUT, QUE LA
CAPACITE DE COURANT AU POINT D’INTERFACE
EST ASSEZ POUR CET EQUIPEMENT.

L0086, Rev. D AMS SENSIT II GLASS FRONT VRM VENDOR
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4.2 VENDOR PREPARATION
4.2.1 Inspection
Inspect the vendor carefully for shipping damage
prior to signing the carrier’s delivery receipt. Check for
dents on the top or sides of the vendor, bent legs, broken
glass, or other damage on the exterior of the machine.
Check the interior for components that may have been
knocked loose or other damage.
4.2.2 Mounting and Connecting Coin Mechanism
(Changer)
The AMS vendor will support any NAMA-approved
Multi-Drop Bus (MDB) Coin Mechanism. On some export
models, the Mars-type Executive Mechanism is supported.
Please read the coin mechanism manufacturer’s literature
before proceeding.
1. Always disconnect power to the control board
before servicing.
2. On the inside of the main door, locate and open the
access doors on the left side. Locate the metal coin
chute which leads from the coin slot on the front of the
door. Below the coin chute are (3) screws which
correspond to slots on the back of the changer. Do not
adjust these screws.
3. Install the changer by placing the large round opening
at the bottom of each slot over a screw head. Be
careful to hold the wiring harnesses in this area out of
the way. Once each of the round openings are over the
screw heads, the changer is lowered to engage the
narrow portion of the slot with the shank of each screw.
4. Tighten the mounting screws (reference manufacturer’s
literature).
5. Connect the wiring harness to the bill validator (if
applicable) or to the MDB connector from the control
board.
6. Adjust the metal coin chute as required to align the
chute with the changer.
7. Reconnect power to the control board.
4.2.3 Mounting and Connecting Bill Validators and Card
Readers
The AMS vendor will support any NAMA-approved
Multi-Drop Bus (MDB) bill validator or card reader. Please
read the device manufacturer’s literature before
proceeding.
1. Always disconnect power to the control board
before servicing.
2. On the inside of the main door, locate and open the
access doors on the left side. Locate the metal coin
chute which leads from the coin slot on the front of the
door. Above the coin chute are (2) metal plates, each
fastened to a set of (4) threaded mounting studs which
correspond to the mounting holes in the bill validator.
Either set of mounting studs may be used for a bill
validator or card reader. The lower mounting position
is ADA approved for consumers with disabilities.
3. Remove the four nuts that retain the steel cover panel.
Remove the steel cover panel in the escutcheon.
4. Refer to the manufacturer’s literature for instructions on
accessing the mounting holes in your device. Place the
mounting holes over the threaded studs and reinstall
the nuts. Some devices may require spacers, which
are available from AMS (Part Number 20258).
5. Connect the wiring harness to the MDB harness from
the control board. If two devices are installed, connect
the second device to the validator.
6. If a coin mechanism has been previously installed,
disconnect it from the control board MDB harness and
connect it to the validator or second device if installed.
7. Reconnect power to the control board.
4.2.4 Test Loading and Configuration
Before putting the vendor on location, it is a good
idea to determine the placement of products on the trays.
Place at least one product in each helix to check for fit.
1. Remove the cardboard spacers and ties securing the
trays.
2. Refer to Section 5.3 for tray vertical adjustments, and
Section 5.4 for tray column configuration when
configuring your vendor to suit your product.
3. Make sure the product can slide in and out of the helix
easily. If the product is too snug, it may cause the
helix to jam during vending. Place it in a helix with a
larger opening.
4. Likewise, if the product is too loose in the helix, it may
not vend properly. Use a helix with the smallest
opening that will allow the product to slide in and out
freely. Refer to Sections 5.6 and 5.7.
5. Place tall, narrow products in a column with a candy
pusher bar, which is an adjustable bar used to push
the product to one side of the column. Typically these
are installed in columns 9 and 0 on the candy trays.
6. Make sure there is adequate clearance between the
tops of the packages and the trays above when sliding
the trays in and out, and when the product is being
vended.
7. This is also a good time to set the end position of the
helix to make sure the first product is held securely in
the helix. To do this, vend a product from each
column. The end position of the helix will
automatically be set to the correct position when a
product is vended. The control stops the helix the
instant the sensor detects a product falling in the
hopper.
8. If desired, the end position can be set manually by
pulling the helix out of the motor, rotating it, and
reinserting it in the motor. Note that this position is
reset automatically after the first vend.
9. Test vend the product and add a helix ejector if
necessary. The helix ejector is a plastic device
installed on the front end of the helix to kick out the
product (refer to Section 5.9 Helix Ejector).
4.2.5 Configuring Motors
If the arrangement or number of motors has been
changed they will need to be configured.
1. Press the mode switch on the control board (refer to
Figure 3.1, or look at the decal inside the access door
for the location of the mode switch).
2. Using the # key, scroll through the menu to “TRAY
SETUP”.
3. Press 6to configure the motors. If the number of
motors displayed does not match the number of

AMS SENSIT II GLASS FRONT VRM VENDOR L0086, Rev. D
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motors in the vendor, press 1*0to jog all the motors
in the vendor.
4. Watch the display for missing motors that should be
connected.
4.2.6 Installing Price Labels
After determining the product placement, install the
price labels. The labels are shipped in the envelope with
this manual.
1. Insert the bottom edge of the label in the lower groove
of the extrusion on the front of the tray.
2. Carefully press in on the the label until it bows enough
to snap into the top groove of the extrusion.
4.2.7 Setting Prices
After product placement and installation of the price
labels, set the prices into the vendor (refer to Section 6.6
Price Settings).
1. To enter the service mode, press the mode switch on
the control board (refer to Figure 3.1, or look at the
decal inside the access door for the location of the
mode switch).
2. Using the #key, scroll through the menu to “PRICE
SETTINGS”.
3. Press the selection for which you want to set the price
(example: 12).
4. Press 9 to edit/change price.
5. Enter the price and press * * to save the new price.
Tip: press * 1 to set the whole tray to that price, or * 2
to set that price for the entire vendor.
6. Press the mode switch, or close the door, to exit
service mode.
7. The prices as set will be maintained by the vendor
even if there is a power failure or if the machine is
unplugged: however, prices will need to be reset if the
program chip is changed or if the configuration of
motors or trays is changed.
4.3 ON-SITE INSTALLATION
4.3.1 Remove the Shipping Boards
1. Split the shipping boards by inserting a crowbar into
the slots at either end.
2. If necessary, lift the vendor to remove the broken
boards using properly rated equipment. Do not tilt
the vendor. Do not attempt to lift the vendor with
a 2-wheel hand truck.
4.3.2 Placing the Vendor in Location
1. Place the vendor within 5 feet of the designated power
outlet. The power outlet should be accessible when
the vendor is in position, and the ventilation opening
in the back of the vendor must be clear of
obstructions.
2. Allow at least 4 inches between the wall and the back
of the vendor for air circulation.
3. Make sure the vendor does not block walkways or
exits.
4. Do not place the vendor in a location where it can be
struck by vehicles.
5. Leave at least 18 inches between a wall and the hinge
side of the vendor to prevent the door hitting the wall
when opened, or use a protective wall bumper. At a
minimum, the door must open wide enough to allow
the trays to be pulled out.
6. The vendor is designed to meet ADA guidelines for
persons in wheelchairs using a parallel approach (side
of wheelchair adjacent to front of vendor). Make sure
there is adequate room to maneuver a wheelchair into
this position in front of the vendor.
4.3.3 Leveling the Vendor
For safe operation the vendor must be level.
1. On the bottom of the vendor are four (4) threaded
leveling legs located at the corners of the cabinet and
a fifth support screw under the door. Before
beginning, be sure that all five leveling legs are
screwed in completely.
2. With the door closed and locked, check the four main
legs and adjust any leg that is not contacting the floor.
Make sure the support screw under the door is all the
way up and is not contacting the floor at this time.
3. Place a level on top of the cabinet and check for
horizontal from side-to-side.
4. Adjust the leveling legs on the low side one turn at a
time until the cabinet is level.
5. Repeat the last two steps to level the vendor front-to-
back.
6. After the vendor is level, adjust the support screw
under the door until it contacts the floor.
4.3.4 False Leg Installation
Figure 4.1 Tip-Over Warning
WARNING
The False Leg helps to prevent the machine
from tipping forward when the vendor door is
open and one or more bottle trays are extended.
Failure to install the false leg on vendors with
bottle trays may result in serious injury (refer to
Figure 4.1).

L0086, Rev. D AMS SENSIT II GLASS FRONT VRM VENDOR
4-4
CAUTION: Wear gloves-edges may be sharp! Always
wear eye protection when servicing vendor!
TOOLS REQUIRED:
1/4” Nut driver or socket wrench
Figure 4.2 False Leg Installation
1. Align the holes in the top of the false leg with the
1/8” holes on the left side of the bottom of the
door (refer to Figure 4.2). The closed end of the
false leg should be facing forward.
2. Install screws through the holes and tighten until
snug. Do not over tighten.
4.3.5 Initial Power-Up and Cool-down
When placing a refrigerated machine on a new
location it is important to allow the machine to cool to the
operating temperature prior to loading products
requiring refrigeration. Depending upon the machine’s
initial temperature and ambient conditions, it will take about
4 to 5 hours to accomplish this. Normal practice is to place
a machine on location and come back the next day to load
it. All products should be pre-packaged.
1. Plug in the vendor.
2. Check that the lights inside the door come on: the
chiller may or may not be running in its cycle at this
time.
3. Enter the service mode and check that all settings are
correct.
4. Check error codes for problems.
5. Load product after the vendor has cooled. Load one
tray at a time, preferably from the bottom up.
6. Insure vendor is operating properly.