All American Scoreboards MP-7820 Troubleshooting guide

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A Product of Everbrite 401 S. Main St., Pardeeville, WI 53954
Phone: [phone] Fax: [phone]
www.allamericanscoreboards.com
OPERATING INSTRUCTIONS AND SERVICE MANUAL
LED Racing Scoreboard
MP-7820
EFFECTIVE S.N. 18,725, June, 2006

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TABLE OF CONTENTS
1. General Information Page 3
1.1 Description
1.2 Identification
1.3 Damage
1.4 Damage Claim Procedure
2. Installation Page 4
2.1 General Information
2.2 Installation
2.3 Electrical Connection
3. Control Console Operation Page 5 - 7
3.4 Race Mode
3.3 Time Trials
3.4 Initializing Scoreboard
3.3 Console Power
3.2 Console Display
3.1 Scoreboard Power
4. Maintenance and Troubleshooting Page 8 - 11
4.1 Introduction
4.2 Test Equipment
4.3 Troubleshooting
4.4 Troubleshooting Guide
5. Replacement Parts List Page 12 - 14
5.1 Scoreboard Display Parts
5.2 Controller Assembly
6. Diagrams Page 15 - 22
6.1 Control Consol Keyboard & Slipsheet Layout
6.2 Scoreboard System Layout
6.3 Power Wiring
6.4 Scoreboard System Layout
6.5 Controller Assembly Wiring
6.6 Installation Drawing
6.7 Installation Drawing Cont.
6.8 Installation Drawing Cont.

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1. GENERAL INFORMATION
1.1 DESCRIPTION
Your All-American scoreboard has been carefully inspected and tested before leaving the factory. It is
possible, however, that components may be loosened or forced out of adjustment in transit. If this occurs,
follow the troubleshooting guide (section 4). If equipment then fails to operate, contact immediately:
1.2 Identification
ALL-AMERICAN uses a serial number for scoreboard identification. The serial number tags are located on
the back of the control console and the lower right hand corner on the face of the scoreboard display. When
contacting the factory for assistance it is important that the model number and serial numbers are known.
1.3 Damage
Upon receipt of scoreboard, check for visible damage. If this occurs, or if damage is found
after shipment has been accepted, follow the damage claim procedure.
1.4 Damage Claim Procedure
If damage is not immediately noticed, but is noticed after unpacking the scoreboard, contact the delivery
company immediately. It is very important that the product is inspected within 24-48 hours of receipt, and if
damage is noticed, the carrier must be notified immediately. All American Scoreboards should also be
contacted at this time and informed of any replacement parts or repairs necessary.
ALL-AMERICAN Service Departmen
t
P.O. Box 100
Pardeeville, WI 53954
Toll Free: 800-356-8146
[email protected]
Parts being returned for repair are to be sent to:
ALL-AMERICAN Service Department
401 S. Main Street
Pardeeville, WI 53954
NOTE
If you need to send parts in for repair, please call the ALL AMERICAN
service department for a returned goods authorization (RGA) number.
This will help us track you order and process it more quickly & efficiently.

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2. INSTALLATION
2.1 General Information
Shipping papers accompany each scoreboard. Check carefully to see that you receive the following:
2.2 Installation
Select the location best suited for visibility by the majority of spectators. Preferred position is facing east or
north to avoid direct sunlight on the face of the scoreboard (if day games are played).
For permanent mounting to uprights, see the enclosed installation drawing in section 6.
Consult Section 6 for junction box and scoreboard wiring.
2.3 Electrical connections
The MP-7820 scoreboard requires one 120 VAC 20 AMP circuit.
IMPORTANT !!!
To protect the control from damage, it is advisable to disconnect
the control and store in a dry secure area when not in use.
NOTE
This equipment is UL approved and complies with the requirements in part 15 of the
FCC rules for a class A computing device. Operation of this equipment in a residential
area may causeun acceptable interference to radio and television reception, requiring
the operator to take whatever steps are necessary to correct the interference.
1 ea Racing Display (4 Pieces)
1 ea Control Console
1 ea Service Manual
1 ea Mounting Hardware Package
? ft. control cable (if ordered)
1 ea Horn (if ordered)

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3. CONTROL CONSOLE OPERATION
3.1 Scoreboard Power
Turn on the branch circuit to the scoreboard. The time will will show ".00".
3.2 Console Display
The Liquid Crystal Display module displays the scoreboard information entered from control console. The
following information is displayed continuously: Time, Lap, & Position.
3.3 Console Power
Plug the power adaptor into the control console and into a 120 VAC wall outlet.
Push once to turn the console on.
Push a second time to shut the console off.
When first turned on; the console display should show as follows:
3.4 Initializing Scoreboard
Enter the two digit code (88) shown in the lower left corner of the keyboard as in
the following example: Push .
When the proper code has been entered, the console display will show as follows.
The scoreboard display will now show :00 in the time section.
ON/OFF
ON/OFF
RACING CONTROL
MP-7000 V 2.00.A 2003
CODE 8 8 ENTER
TOP 5
LAP 0

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3.3 Time Trials
Push to enter the time trial mode. The scoreboard time will show .00
and the LCD display will show
Select the laps to be time trialed by pushing , , or .
The LCD display will reflect your selection.
Push to enable the electric eye.
When the EE is enabled the LCD display will show EE in the lower left corner.
If, for example, car number 55 is going to time trial; Push ,
and the car number , and then .
Car number 55 would appear on the scoreboard in position 1, and you would be ready for time trials.
When the EE beam is broken the time will start.
The 1/100th and 1/1000 digits are blanked while the timer is running.
Push at any time to disable the electric eye.
When the EE beam is broken a second time, the time will stop and the hundredths and
thousandths digits will display on the scoreboard and LCD display.
If you are timing 2 or 3 laps at a time, when the car breaks the EE beam the second time, the time
displayed on the scoreboard will stop for two seconds and then resume timing the second lap. The LCD on
the control console will show the time for the first lap in position 1 and the elapsed time for the second lap
in position 2.
After the time trial you may post the lap times as follows: Push to reset the times to
zero. The scoreboard will now read .00 , and the times on the LCD display will all revert to zeroes.
TIME/RACE
.000 --.--- --.--- .
1 LAP TRIAL
1 LAP 2 LAP 3 LAP
EE ENABLE
POS 1
55ENTER
EE ENABLE
TIME RESET

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Now push ,then and the time 18.483 will post on the scoreboard.
If a car starts to time trial but doesn't finish the lap, you may record the times for any
completed laps, then push to reset the scoreboard and LCD displays.
You may now post the lap time of the completed lap and you are now ready for the next car to time trial.
3.4 Race Mode
The LCD shows the car positions for five (5) cars and the Lap number at all times.
Push to increment the lap counter.
Push to decrement the lap counter.
Push followed by the desired number(s), then to correct the Lap counter.
Push followed by the Car #, then to load the 1st Place Car #.
(Repeat the procedure for position two thru position ten)
If a car drops out during the race, you may push through for the
position that car was running in, then , to clear that car number and shift all
following positions up.
3.5 Dimmer
Push to dim the lamps during night use.
18483ENTER
TIME RESET
LAP +1
LAP - 1
LAP ENTER
POS 1 ENTER
POS 1 POS 10
SHIFT
DIM
WARNING!!!
120 VAC wires are exposed whenever the cover over the controller assembly is
removed from the scoreboard. Use extreme caution during troubleshooting or repair.
To avoid possible damage to equipment or personal injury, always turn off the main
power before removing the cover or replacing assemblies, or replacing lamps.

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4.0 MAINTENANCE AND TROUBLESHOOTING
4.1 Introduction
This section gives maintenance and troubleshooting information. Included are troubleshooting guides for
typical scoreboard malfunctions. If the cause of a problem cannot be determined, please contact the
Customer Service Department.
4.2 Test Equipment
A simple analog or digital voltmeter will be sufficient for all user repairable problems. Printed circuit
boards requiring troubleshooting should be returned to the factory.
4.3 Troubleshooting
Whenever possible, follow the troubleshooting guides prior to contacting the Customer Service
Department. If a problem not described in the guides exists, contact the customer service department
immediately. Read through the appropriate troubleshooting section before beginning a repair. Refer to the
diagrams in chapter 6 as an aid in troubleshooting scoreboard malfunctions.
4.4 Troubleshooting Guides
(A) Scoreboard doesn't light and console doesn't work:
(a) Check that the main power switch is turned on and providing power to the scoreboard.
(b) Check to see that the green Led is lit on each power supply.
(c) Check for 24 VDC at the power supply terminals.
(d) Check the 110 VAC power connections and voltages at the scoreboard.
(e) Replace any defective or blown fuses.
(f) Check for 12 to 16 VDC on the red and black wires at the data cable terminal block.
(g) Contact the Customer Service Department.
(B) Scoreboard digits:
(a) Check all connections.
(b) Turn the main power "on".
(c) If the scoreboard still doesn't light, check the items in section (A), power supply voltage and fuses.
(d) Check if LED D1 on the receiver board is lit. If not, check that the receiver board is plugged into
the power supply board, then contact the customer service department.
(e) Check to see that the LED on the first driver board (closest to receiver) is flashing. If not, check the
data cable connections (orange and grey wires) from the receiver to the drivers, and check to be sure
that the power connection to the driver board is OK.
(f) If the driver board LED is still not flashing, connect a different driver board to the receiver (first in
line). If the LED is now flashing, the first driver board should be replaced. Otherwise the problem
is on the receiver board.

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(C) The scoreboard digits light but the console doesn't work:
(a) For a cable connected system, check for 12 to 16 VDC between the red and black wires in the
junction box. For wireless consoles, check the output of the wall transformer by unplugging it from
the console, putting the + meter lead into the center cavity of the power plug and touching the meter
lead to the metal shell. The reading should be at least 10 VDC.
(b) If the voltage is 10 V or more, turn on and code in the console, even though it may not appear to be
working. Listen for beep sounds when pressing the keys, and see if the scoreboard responds at all. If
the scoreboard is radio controlled, go to section D, step 3. Otherwise contact customer service with
results or see Advanced Troubleshooting, in section C.
(c) If the voltage from step 1 is zero, measure the voltage on the red and black wires at the terminal
block inside the scoreboard. If the voltage is still zero, go to section A, step 3. Otherwise check the
cable to the junction box for continuity.
(d) Refer to advanced troubleshooting, section B to connect the console directly to the receiver board.
(D) The scoreboard digits light, the console works, but there is no control of the scoreboard:
(a) If the scoreboard is a hardwired system, check for 1 to 4 volts AC on the green and white wires at
the junction box (console on and coded in). Then go to step 6.
(b) With wireless consoles, be sure that the battery (if so equipped) is fully charged, or better still, use
the wall transformer to power the console.
(c) Check the LED on the radio adapter board inside the scoreboard. If it is lit, turn the console off.
This LED should go out about 5 seconds later. Turning the console on again should relight the LED.
(d) Bring the console within 10 to 25 feet of the scoreboard and test again. If the radio adapter LED
now works, check and tighten antenna connections as necessary, both in the scoreboard and in the
console. CAUTION: the antenna connection at the radio can be easily broken. Push or pull the
connector STRAIGHT on or off!
(e) Check to see if D1 is lit. If not, check that the receiver board is plugged into the power supply
board, then contact the customer service department.
(f) With the console turned on and coded in, check to see that LED D2 on the receiver board is
flashing. If not, refer to Advanced Troubleshooting for instructions on connecting the console
directly to the scoreboard or contact customer service.
(g) Starting with the driver board closest to the receiver, check to see that the LED on each driver board
is flashing. If not, check the data cable connections (orange and grey wires) from the receiver to the
drivers, and check to be sure that the power connection to the driver board is OK.
(E) The scoreboard works, but some lights stay on all the time:
(a) With the main power "OFF", disconnect (and tag) the suspect digit from the driver board. Plug a
known good digit into that position on the driver card. Do Not Plug the Suspect Digit into any other
location!
(b) Turn the power back on. If the good digit shows the same problem as the original digit, there is a
problem on the driver PCB assembly. See the original digit, replacement parts list for the proper
replacement part or refer to Advanced troubleshooting, section A to swap another driver board into
that position. There may also be a problem with the digit or its cabling, continue with step 3.
(c) Check the digit and cable assembly for shorts to the scoreboard frame and to the + and - power

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leads.
(d) Plug the suspected bad digit into another output position. USE the SAME driver board (A bad digit
may be the cause of a driver board failure). If the same lights remain on, replace the digit and driver
board.
(F) The scoreboard works, but some lights do not come on:
(a) If only part of a digit works, e.g. a 0 looks like a U, go to step 6.
(b) If one or more of the digits are completely blank, check the LED on the corresponding driver board.
(c) If the LED is blinking, check the power connection at the opposite end of the board for 24 VDC. If
not, check the power and data cable connections on the driver board.
(d) Plug the blank digit into a known good driver board position. If it is still blank, check for broken
wires or bad connections in the digit cable. Replace the digit if the cabling is OK.
(e) If the digit now works, see the replacement parts list for the proper replacement driver board or
refer to Advanced troubleshooting, section A to swap another driver board into that position.
(f) Disconnect the suspect digit and plug a known good digit into that driver location.
(g) If the good digit shows the same problem, see the replacement parts list for the proper replacement
driver board or refer to Advanced troubleshooting, section A to swap another driver board into that
position.
(h) If the good digit is working, check for a broken wire or bad connection on the 10 pin connector.
(i) Contact customer service for the proper replacement digit.
4.5 Advanced Troubleshooting
In emergency situations (Tournament begins in an hour), the following steps may help to make the
scoreboard usable in a temporary fashion. These procedures are best performed by someone that has
experience working on electronic equipment. If possible, consult with customer service before proceeding.
(A) All of the driver boards in a 7000 series scoreboard are interchangeable. However, each board has
an address programmed inside its microcontroller chip. The chip from the board being replaced must
be put into the new board for proper operation. Example: The scoring driver of a football board has
a problem. The Ball On/Yards To Go driver can be used in its place. (Ball on and yards to go will
not be usable until a new driver board is received from the factory).
(a) Remove power from the scoreboard.
(b) Take the bad driver board out and set it aside. Put the replacement driver in position.
(c) Remove the processor chip from the new driver.
(d) Carefully take the processor chip out of the old driver board and install it in the replacement board.
Be sure the notched end of the chip is aligned correctly.
(e) Put the processor chip from the new board into the defective driver board so it doesn't get lost.
(d) Reconnect power, data, and the display cables to the new driver board.
(B) Direct connection of consoles to scoreboards can be done to ensure that the electronics is working
properly. For radio controlled systems, skip to step 8.
(a) For a hardwired system, the cover of the junction box with the connector and wire pigtail can be

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used. Open the junction box and disconnect the connector wires at the terminal block.
(b) Take the cover plate/connector assembly up to the scoreboard. Attach the red and black wires to the
matching positions on the terminal block. Disconnect the red and black data cable wires (that go to
the junction box).
(c) Attach the green and white wires from the cover plate connector to the terminals on the lightning
protector board where the same colored wires connect to the receiver board.
(d) Disconnect the data cable (to the junction box) green and white wires from the lightning protector
board. Mark the board so that the wires can be put back on the correct terminals.
(e) Test the system. If it works, move the green and white wires from the cover plate connector to the
other two terminals on the lightning protect board.
(f) Test again. If the scoreboard works, there is a problem in the data cable somewhere between the
scoreboard and the junction box. If not, the lightning protector board must be replaced.
(g) The data cable can be checked by re-installing the junction box cover plate and connecting both
greenwires to one of the green wire terminals on the lightning board, and doing the same with the
white wires. While the scoreboard will operate with the lightning protect board bypassed in this
fashion, it should be fixed as soon as possible, since the board also protects the electronics in the
scoreboard from other sources of potentially damaging interference.
(h) Radio controlled consoles may be connected directly to the scoreboard through the 12 pin radio
connectors. Remove the radios and interface boards.
(i) Using 22 gauge solid wire, connect pin 10 of the console connector to pin 10 of the scoreboard
receiver board connector. Also connect pin 2 of the console connector to pin 6 on the receiver board
connector.
(j) Powering the console from the battery or wall cube, the system should operate. This eliminates any
radio related communication problems.
(C) Console problems:
(a) Power is OK, but console does not turn on: check that the keypad connector is plugged into the main
board in the console.
(b) Console beeps, but has no display: check the ribbon cable between the main console board and the
display module.
(c) Erratic operation, abnormal display: check the socketed IC chips to be sure that they are well seated.
NOTE !:
If it is necessary to operate the scoreboard this way,
keep the 2 wires as short as possible (10 ft. max),
since there is no protection on these lines,
keep them away from components that can
cause stray RF frequencies.

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5. REPLACEMENT PARTS LIST
5.1 Scoreboard Display Parts
figure 1

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DISPLAY ASSEMBLY
REPLACEMENT PARTS LIST (MP-7820 Racetrack)
fig.& MFG PART REF VENDOR
index NUMBER DESCRIPTION DES PART #
1- 000000 Display Assembly 150221
1-2 152101 Controller Assembly MP-7820 152101
*****SEE FIGURE 2*****
1-3 121880 Fuse, 15A 250V ABC-15 (3AG)
1-4 LED5M24AR 24” LED Digit (top section)
1-4 LED5M24BR 24” LED Digit (middle section)
1-4 LED5M24CR 24” LED Digit (bottom section)
1-7 000000 24” Window, Car Number
1-8 152026 24” Window, Position/Minutes time
1-9 000000 24” Window, Hundredth of a second time
151735 Control Console MP-7000 151735
151692 PC BD Transmitter
930894 Connector, 6 Pin Male Cable
930895 Connector, 6 Pin Female
EL057700 LCD Display, 2 Line 20 Character
151682 Keypad Assembly, HB002400
WH009100 Ribbon Cable Assembly, 14C 8" WH009100
MP00468P Keyboard Enclosure
151740 25ft Cable Assembly
151915 Junction Box, Single MP-7000 151915
930895 Connector, 6 Pin Female
000000 Cable Direct Burial, MP-40 Control 8723
000000 Terminal Strip, 7C 670-7
150257 Optional Electric Eyes 150257

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5.2 Scoreboard Controller Assembly Parts
figure 2
CONTROLLER ASSEMBLY
REPLACEMENT PARTS LIST (MP-7479) Controller Assembly
fig.& MFG PART REF VENDOR
index NUMBER DESCRIPTION DES PART #
2- 152101 Controller Assembly MP-7820 A2 000000
2-1 BL00059P Power Supply, 24V/300W A10-15 BL00059P
2-2 EL00852P Driver PCB Assembly, MP-5000 A4-8 EL00852P
2-3 EL00863P Receiver PCB Assembly, MP-5000 A3 EL00863P
*** PROGRAM 3MP-CNT-V00***
2-4 152000 Voltage Reduction PCB Assembly A19 152000
2-5 EL00525P Relay, 12 VDC DPDT 10 Amp Contact K1 EL00525P
2-6 701011 Fuse, 5A 250V F1-F8 MTH-5
2-7 EL00551P Fan, 24V/40CFM 3" EL00551P
2-8 701137 Terminal Block, 5C TB1 670-5

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2-9 705723 Spacer, P.C. Board LCBS-6-01
6. DIAGRAMS
6.1 Control Console Keyboard and Slipsheet Layout

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CONSOLE KEYBOARD
6.2 Scoreboard System Layout

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SYSTEM LAYOUT
6.3 Power Wiring

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POWER WIRING
6.4 Scoreboard System Layout

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figure 4
SYSTEM LAYOUT
6.5 Controller Assembly Wiring

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CONTROLLER ASSEMBLY
6.6 Installation Drawing