Download General Questions

General Questions
What is the purpose of the DC Power Supply?
Change the AC line voltage into DC voltage levels the game requires.
What is the purpose of the AC Power Distribution Unit?
Filter the AC line power. Provide a centralized distribution point for switched and unswitched AC power
and current limiting devices.
.
How can you tell a Slow Blow fuse from a Fast Blow fuse?
Fast blow fuses look more like a simple straight wire.
Name the Video signals likely to be found in a connector going to a monitor.
Red
Blue
Green
Vertical sync
Horizontal Sync
Ground
Touchscreen Transmit Data
Touchscreen Receive Data
Touchscreen ground
Touchscreen Power
AC power, Hot
AC power, Neutral
AC power, chassis ground
What signals would you likely find on a WBA-13?
answer
What signals would you likely find on an RS-232 Seiko Ticket printer?
answer
What signals would you likely find on an Ithaca Ticket Printer?
answer
What is the typical voltage you would measure across a fluorescent lamp when it is good and
working?
50 Volts AC
What does SRAM mean and what might one be used for in a Slot Machine?
Static Random Access Memory. Used to store temporary data, bookkeeping, game statistics, configuration
information, jurisdiction information, game history, current game data, current random numbers.
What does EPROM mean and what might one be used for in a Slot Machine?
Erasable Programmable Read Only Memory. Game programs, Paytable information, graphics, messages
to be displayed,
What does EEPROM mean and what might one be used for in a Slot Machine?
Electrically Eraseable Programmable Read Only Memory. Used for backup archive of configuration
information, jurisdiction, soft meters.
What makes a FlashROM different from any of the other ROMs and what might it be used for in a
Slot Machine?
Download Programmable ROM, It falls into the ROM family because the contents are non-volatile (not lost
when power is removed).
List the assemblies that are likely to have a microprocessor or microcontroller them?
Logic board (2, main CPU and Bitblitz)
Bill Acceptor
VFD Display Controller
Ticket Printer (2)
Coin-In Optics (Bally)
Hopper Control Board (IGT, Bally)
BEII board
Progressive controller
Touchscreen controller
Multimedia control board
LCD
Vendor added feature top box (AC Coin, Shuffle Master, or WAP)
Coin Comparator (on certain models, Condor or MC-4x series)
LED displays (marquee lights)
Acres Keypad
Acres VFD
What would you expect the normal voltage across a red LED to be?
1.6 Volts (about)
What would you expect the normal forward voltage to be across a silicon signal diode?
0.6 to 0.7, as high as 1.0 Volts
What would you expect the normal voltage difference to be between the Base and Emitter of a
Bipolar Junction transistor?
0.6 to 0.7 Volts
What is a Triac used for? To control a load running off AC.
What is an SCR used for? To control a load running off of DC.
What is a Bridge Rectifier used for? Change AC to DC, full wave rectification.
What is a peripheral device?
An add-on device not normally a part of the basic slot machine, and perhaps, specified by the purchaser.
Bill Acceptors, Hoppers, Ticket Printers, Player Tracking interfaces...
What is the function of an IC with LM7805T on it?
A Voltage regulator, Positive 5 Volts at 1 Amp, TO-220 case.
Why would we want to put an Opto Isolator on the input of a logic board?
To isolate the logic circuits from voltage spikes in the inputs.
Why would we want to put an Opto Isolator on the output of a logic board?
To isolate noisy high current circuits from logic circuits.
What would the voltage across a Phototransistor be when in a light beam? 0.3 Volts (about)
What does SSR stand for and where might we use one in a Slot Machine?
Solid State Relay. Used to control devices that run off of AC from logic circuits running on DC.
What is the purpose of a Power Transformer?
To convert one voltage AC to another voltage AC.
To isolate ground systems.
Why should you use an isolation transformer when testing a monitor?
Safety. The likelihood of the monitor running off of a switching power supply powered straight from the
rectified line voltage. A serious shock hazard.
How high does a static electric charge have to be before you can feel it? Thousands of volts
How high does a static electric charge have to be to destroy a CMOS IC? Hundreds of volts
When is a wrist strap used to protect you from getting shocked?
When cleaning something that generates a high static voltage, like the bowls on the AC Coin games that
pop ping-pong balls. Using it protects your comfort as well as the circuitry.
What type of cleaner is used on bill acceptor heads? Non-Alcohol type.
What type of cleaner is used on Ticket printers? Alcohol type.
Why should you wear a wrist strap when changing an IC?
To prevent static charge build up from damaging the ICs.
What is the proper procedure for changing a defective IC?
Wear a ground strap. Cut the legs of the IC off as close to the IC as possible. Remove the pins from the
board. Clean off the old solder. Install a socket where the IC is to go. Inspect for proper soldering. Clean.
Install the IC in the socket.
Are electrolytic capacitors polarity sensitive?
Usually, yes.
What temperature range of electrolytic capacitors should be used in video monitors?
105 degree
A transistor with a gain of 100 (hfe) at 10 mA (IC) will likely have what gain at 250 mA?
20. Gain decreases with higher collector current, as the transistor reaches saturation.
A diode with a forward voltage of 650 mV is likely to be what kind of diode?
Silicon
How can you tell if an Infrared LED is working properly?
Use an infrared detector card. Measure operating voltage. Should be around 2 Volts.
How do you check a phototransistor?
Under power, shine a flashlight on it and see if the voltage decreases to below 0.6 Volts.
What is the likely type of circuit to be protected by a fast blow fuse?
Logic circuits
When is power present at an unswitched AC line outlet?
None of the above is correct. Unswitched power is hot anytime the game is plugged into an AC outlet. It is
usually in the circuit between the power switch and fuse and the hot side of the AC line.
How much voltage should you measure between the Neutral line and the cabinet ground on a 120
VAC power line?
0 Volts AC
Describe a #73 lamp.
T1 3/4 size body
Wedge base
12 Volts
60 mA (0.06 Amps)
720 mW
Describe a #55 lamp.
T3 1/4 size body
Wedge base
6.3 Volts
? Amps
? Watts
Describe a #86 lamp.
T1 3/4 size body
Wedge base
6 Volts
120 mA (0.12 Amps)
720 mW
What information is not available on a PAR sheet of an IGT S2000 game? Processor type
On a PAR sheet, what does 3R2CM mean? Three reel, two coin multiplier
Is a Player Panel switch an Input or an Output? Input
Is a Player Panel lamp an Input or an Output? Output
Is a Hopper an Input or an Output? Both
What type of file is our Parts List? Excel, spreadsheet
What software is used to put a file into the PDF format? Adobe Acrobat
What steps have to be taken to take a picture in a book and make it a hyperlink reference in our
parts list?
Scan in the picture on a scanner in a suitable graphics format. Move the file to the directory it will reside
at when it is to be referenced. Add a text message describing the file in the PartsList. Highlight and right
click on the text message and select Create Hyperlink. Point the hyperlink to the file you just scanned in
and saved.
What software do we use to create schematic diagrams? OrCAD
How do we get the schematic drawing we just created to be included on a page in our training
material (pdf format)?
Print the page from OrCAD. Scan in the picture on a scanner in a suitable graphics format, selecting the
section you want to make into a graphics file. Move the file to the directory it will be a part of. Edit the
Word file the picture is going to be a part of. Move the cursor to where you want the picture to be in the
Word file. Insert Picture from file. Select the file to be inserted. Right click on the graphic. Select Format
Picture. Select the picture size, position, and text wrapping preferred. Move the picture and anchor it
where it belongs
Where would you go to find out more information about this device?
Motorola Data Book, Motorola Web Site, IC Master, Distributor's catalogs, Google on
MAD1103, Bench Tech or Slot Tech forum, www.protekdevices.com
What is the part number? MAD1103 What is the manufacturer? Motorola
What is the difference between a CC-16 24 V and a CC-16 12 V?
The CC-16 24 V runs on 24 Volts AC or DC, does not have an Inhibit input, but does have circuitry to
convert the 24 Volts AC into DC and drop the voltage down to the 12 Volts the circuitry runs on. The CC16 12 V does not have the circuitry to adjust the operating voltage, but does have an Inhibit input that
prevents the Acceptor coil from operating.
What is the difference between a CC-16 13 V and a CC-16 12 V?
The CC-16 12 V Inhibit input prevents the Acceptor coil from operating, but still generates a Sense output
when a good coin is accepted. The CC-16 13 Volt (intended for IGT) has a different connector(Molex KK100 series instead of the usual JST connector) and the Inhibit input also prevents the Sense signal from
being generated.
What signal names go to a CC-16 12V type coin comparator?
+12 Volts, Ground, Sense, and Inhibit.
What device can sense a stuck coin in? Coin-In optics
What completes the connection to make the Hopper Level Probe go to ground? The coins in the
hopper.
Are all heads on WBA-11's, WBA-12's and WBA-13's interchangeable?
Yes. The only circuitry in the head is analog amplifiers for the sensors. The difference between WBA's is a
matter of memory capacity and type of memory.
What is the defining difference between a WBA-12 and WBA-13?
WBA-12 has Flash memory. WBA-13 has an EPROM.
What is the ID number for the EPROM in a WBA-13 used in a Williams game? ID044/045W
How do you calibrate a WBA-12 or WBA-13?
Set DIP switches 1,2,3 and 4 on, 5,6,7,and 8 off. Power on. Insert the black and white test paper. It should
read it back and forth a few times, then eject it.
After calibrating a WBA-12 or WBA-13 the LED (or bezel) makes a sequence of nine flashes, pause,
nine flashes, pause (repeats). What does this mean?
?
How much memory is in a 19" monitor with 640 x 480 resolution? None. Monitors have no memory.
What part of the touchscreen can cause the picture displayed on a monitor to be out of focus?
None. No part of the Touchscreen circuit can influence the video signal.
Even with power off the high voltage lead (the big red wire) can cause a shock even after it is
disconnected from the tube. (False)
You can not be shocked while you are wearing an anti-static wrist strap. (False)
Wearing an anti-static wrist strap can cause you to be shocked while working on electronic
equipment. (False)
What is a degaussing coil used for? Demagnetize the metal parts inside the face of the tube.
What is the likely problem if you have a monitor with only a thin white line going across the screen
from side to side? No vertical deflection.
The electron beam is moved across the screen side-to-side by signals in which coil? Horizontal Yoke
The output of an Operational Amplifier is what kind of signal? Analog, or Linear
The output of a Voltage Comparator is what kind of signal? Digital or Binary
The output of a Schmidt Trigger is what kind of signal? Square Wave
What does the following pin names mean on an D-Type Latch?
S - Set input
R - Reset input
Q - Set output, 1 when the latch is Set.
Q\ - Set-Not output, o when the latch is Set.
D - Data Input
Clk - Clock pulse
What does the following pin names mean on a J-K flip flop?
S - Set input
R - Reset input
Clk - Clock pulse
Q - Set output, 1 when the latch is Set.
Q\ - Set-Not output, o when the latch is Set.
J - John
K - Kardash
John Kardash was the engineer at Texas Instruments who designed the J-K Flip-Flop.
What does the bubble on the output of a NAND gate symbolize? An Active Low output.
When will an Exclusive-OR gate have a high out?
Any time the inputs are different (one of them high and one of them low).
When will an EPROM lose the contents of its memory?
When exposed to strong ultraviolet light for about half an hour.
Programs in a slot machine are stored in what device? EPROM
What voltage would you expect to find between power and ground on an SN74HCT00N?
5 Volts DC
In the part number 74HCT00N, what does the HCT signify?
High Speed CMOS, TTL compatible inputs and outputs
In the part number 74HCT00N, what does the N signify? DIP case
What type of circuit is an SN74HCT00N? Digital logic, two-input NAND gate.
What would you reference to find a part number and description of a connector?
Manufacturer's parts catalog or web site. Distributor's parts catalog or web site. Our partslist.
What is the difference between an MTA100 and an MTA156 connector?
MTA100 is 0.100" on pin spacing. MTA156 is 0.156".
What is the difference between a Mini-fit 6-pin connector and a Micro-fit 6-pin connector?
Mini-Fit connectors have 0.165" pin spacing. Micro-fit is 3.0 mm pin spacing.
What is the manufacturer of the connector used on the Coin Mech coin comparators used on most
games (not IGT)? JST
What is the ripple frequency for a full wave rectifier operating off of a 60 Hz source? 120 Hz
Which is higher in frequency, Infrared, Visible light or Ultraviolet? Ultraviolet
What is the difference between a Seiko PSA-66-ST-? and a PSA-66-ST-001N?
The "-001N" version is made for NETPLEX (IGT).
Why does a fluorescent lamp start to blink before it goes out?
As the tube gets older it gets air inside. The air causes the voltage across the tube to increase. The starter
has a voltage trigger slightly higher than the fluorescent lamp. As the tube gets old the voltage across it
approaches the trigger voltage of the starter. When the starter kicks in it conducts, turning off the
fluorescent lamp. When the starter warms up the trigger voltage of the tube lowers below the trigger of the
starter and the light comes on again. The blinking continues until one of the heating elements at the end of
the tube finally burns out, turning the tube off for good.
How does pulling current from the secondary of a transformer cause an increase in primary current?
The current in the primary depends on the inductance of the primary winding of the transformer. One of
these characteristics that determines inductance is permeance of the core which depends on the
concentration of the magnetic field in the core. When we pull more current from the secondary it changes
the magnetic field of the secondary winding which changes the flux in the core, which lowers the
inductance of the primary, which causes more primary current to flow.
Match the following case pictures with the term that describes them. Notice there are 7 pictures but
10 answers to match up. Not all of the pictures are used either. (I didn't want to make this a guessing
game or something you could solve by the process of elimination. The objective is knowledge and
experience, not skill.)
A
B
C
D
E
F
G
____
PLCC (G)
____
DIP (A)
____
SOT23 (F)
____
SOT89 (E)
____
SOIC (B)
____
TO5
____
TO3
____
TO39
____
TO92 (D)
____
Flat Pack
<(C) is not referenced, but is a TO-220>
Match the following schematic symbols with their descriptions. Same rules apply. Not all the pictures are
used and some of the answers don't apply either.
Resistor
Diode
NPN transistor
PNP transistor
N-MOSFET transistor
Triac
SCR
LED
Phototransistor
Opto isolator
SSR
Crystal
Bridge
In the schematic above, what when would you expect to get a low out of Q1?
When AC line power failed.
In the schematic above, what does U2 do?
Voltage regulator, positive 5 Volts.
In the above Block Diagram, what parts might you start troubleshooting for a problem where the
game plays okay but auditing reports Coin-In count is not correct?
Are any of these possible points of problems?
5797-14014-00, the cable between the Coin Mech and the Coin-In Optics board. (no the game wouldn't
play)
09-42000-1, the Coin Mechanism (no, same reason)
A-18097-01, the Coin-In Optics board (no, same reason)
A-16683, the Diverter (no, can't cause the problem. Coin to Drop might be wrong.)
H-001900-00, the cable between the Coin-In optics board and the backplane (no the game wouldn't play)
A-000632-1, the backplane (yes, possible bad connection to Meter PCB)
A-002464-00, the meter PCB (yes, interpretting wrong, pulling the wrong meter)
A-000051-01, the Video Interface circuits (no, can't cause the problem)
A-18886-01, the Video I/O board (no, can't cause the problem)
An open Hard Count Meter (no, would register as a defective meter)
Acres questions
What type of connector do we use on the ends of the Home Run cable?
Molex MTA-156, 22 to 18 AWG
What type of cabling is used between the Bank Controllers and the Switches? CAT5, Catagory 5
What is a Dongle?
The Dallas Keychip that attaches to the Bank Controller and sets the Internet Address for that Ccontroller.
How many games can we assign to one channel of a Bank Controller? 32 max
What does it take to be able to test a Keypad?
Power Supply
BEII
Cabling
VFD
Card Reader
What does it take to be able to test a VFD?
Power Supply
BEII
Cabling
Keypad
Card Reader
What does it take to be able to test a Card Reader?
Power Supply
BEII
Cabling
VFD
Keypad
What does it take to be able to test a Bonus Button?
A meter
What does it take to be able to test a BEII?
Power Supply
BEII
Cabling
VFD
Card Reader
Keypad
Home Run line
Bank Controller
Access to a server
What is the part number for a Communications Cable for an IGT S2000 Upright game?
?
What is the part number for a Keypad? ?
What type of processor is used in a BEII? ?
What voltage at how much current does it take to run a BEII?
24 Volts at 2 Amps