SERVICING THE SCOREBOARD

While your scoreboard was designed for years of trouble-free operation, some problems may occasionally occur.  Electro-Mech Scoreboard Company offers onsite service in some areas.  In other areas, we can help you contact an independent service technician.  In areas in which service is not available from Electro-Mech Scoreboard Company, we will make every effort to answer your questions.  Our trained personnel at Electro-Mech Scoreboard Company are ready to answer your questions from Monday to Friday during the hours of 8 AM to 5 PM Eastern Standard Time.  Be sure to know your scoreboard model number when calling.  Scoreboard replacement parts are always available.  Damaged parts can usually be repaired at a significant cost savings.  Our convenient toll free number is listed at the bottom of every page in this manual.

COMPONENT REPLACEMENT

LED digits and indicators are serviced from the front of the scoreboard.

LED Digits Replacement

The LEDs that form digits are soldered on circuit boards mounted behind metal masks.  Do not attempt to replace individual LEDs.  In case of a malfunction, the entire LED circuit board must be removed.  To avoid damage to the LED driver module, always turn off the power to the scoreboard when removing or replacing LED digits.  Figure 20 shows the components of an LED digit assembly.  Possession indicators are similar in construction.

Figure 20  LED Digit Assembly

1. The ribbon cable that connects to the rear of the circuit board is not designed to support the weight of the assembly.
2. Damage to the ribbon cable may create short circuit paths that will damage the LDM15 LED driver module.
3. Place the assembly on a flat surface and remove the 6-32 kep lock nuts that hold the circuit board in place.
4. Remove the old circuit board.
5. Align the mounting holes in the new circuit board with the threaded studs on the mask and install the replacement circuit board on the mask.
6. Refer to Figure 21 in order to plug the ribbon cable IDC connector onto the circuit board in the proper orientation.

Figure 21  LED Digit Ribbon Cable Connection Diagram

Single Segment Driver Boards are used in some scoreboards to control a second function from an output jack of the LED control board.  These circuit board assemblies are mounted on standoffs behind LED digits, as needed.  In case of a malfunction, the entire circuit board must be removed.  To avoid damage to the scoreboard electronics, always turn off the power to the scoreboard when removing or replacing Single Segment Driver Boards.  Observe proper handling procedures to prevent static damage to these circuit boards.  The table below lists the Single Segment Driver Boards in this scoreboard and their functions.

Figure 22 shows a Single Segment Driver Board mounted behind a LED digit.

Figure 22 Single Segment Driver Board

Single Segment Driver Board Replacement

1. The wires and cables that connect to the rear of the LED digit and Single Segment Driver Board are not designed to support the weight of the assembly.
2. Damage to a ribbon cable may create short circuit paths that will damage the LDM15 LED driver module.
3. Disconnect the wire assembly from the Single Segment Driver Board J3 jack.
   1. Place the assembly on a flat surface and remove the 6-32 kep lock nut that holds the Single Segment Driver in place.
   2. Remove the old circuit board.
   3. Install the replacement circuit board.
   4. Fasten the circuit board in place with the 6-32 kep lock nut.

All other components are located behind the rear access panels.  Figure 23 shows the view behind the upper access panel.

Figure 23  Upper Access Panel Components

Note:  All other LDM15 jacks are unused.

LED Driver Module Replacement

Electrical connections to the LDM15 LED DRIVER MODULE are made with ribbon cable polarized IDC sockets and locking ramp crimp terminal housings that mate with jacks on the module.  The module is secured inside the scoreboard with six machine screws.

1. Do not cut the plastic tie wraps around the ribbon cables.
   1. Remove the six screws.
   2. Remove the module from the scoreboard.
   3. Insert the replacement module in the scoreboard.
   4. Secure the module with the six screws.
   5. Insert the plugs into the jacks on the module.

To avoid damage to the module, always turn off the power to the scoreboard when removing or replacing it.

LPS5 LED POWER SUPPLY MODULE FUNCTIONS

A relay inside the LPS5 Power Supply Module isolates the LDM15 LED Driver Module from the control cable when the scoreboard is shut down.  Connecting the control console to the test jack on the LPS5 Power Supply Module (J5) with the 10 ft. extension cable bypasses this relay.  Figure 24 shows the location of the fuses in the LPS5 LED Power Supply Module.  The table following the figure lists the fuse ratings, functions, and part numbers.

Figure 24  LPS5 Fuse Locations

LPS5 FUSES

Note:  Other manufacturers’ fuses may be substituted for the Bussmann fuses.

LPS7 LED POWER SUPPLY MODULE FUNCTIONS

Figure 25 shows the location of the fuses in the LPS7 LED Power Supply Module.  The table following the figure lists the fuse ratings, functions, and part numbers.

Figure 25  LPS7 Fuse Locations

LPS7 FUSES

Note:  Other manufacturers’ fuses may be substituted for the Bussmann fuses.

LED Power Supply Module Replacement

Electrical connections to the LED Power Supply Modules are made with keyed plugs that mate with jacks on the left side of the module.  The modules are secured inside the scoreboard with four machine screws each.

1. Disconnect the plugs from the jacks on the side of the module.
2. Remove the four screws.
   1. Remove the module from the scoreboard.
   2. Insert the replacement module in the scoreboard.
   3. Secure the module with the four screws.
   4. Insert the plugs into the jacks on the side of the module.

To avoid damage to the module, always turn off the power to the scoreboard when removing or replacing it.

The LED Power Interface board distributes the output from the power supply modules to the LDM15 LED driver module and the LED digit driver – large board assemblies.

LED Power Interface Board Replacement

1. Unplug the wire assemblies from the jacks on the circuit board.
   1. Unseat the circuit board from the standoffs.
   2. Press the replacement circuit board in place on the standoffs.
   3. Each wire assembly is labeled to indicate the correct jack connection.

Figure 26 shows the view behind the lower access panel.

Figure 26  Lower Access Panel Components

Note:  All other LDM15 jacks are unused.

LPS6 LED POWER SUPPLY MODULE FUNCTIONS

Connecting the control console to LPS6 test jack (J5) with the 10 ft. extension cable enables the operation of the lower section of the scoreboard from the lower access panel.  Disconnect the cable wires that are connected to the bottom of the terminal block labeled Data from Top Section.  Figure 27 shows the location of the fuses in the LPS6 LED Power Supply Module.  The table following the figure lists the fuse ratings, functions, and part numbers.

Figure 27  LPS6 Fuse Locations

LPS6 FUSES

Note:  Other manufacturers’ fuses may be substituted for the Bussmann fuses.