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.

If the scoreboard turns on LEDs, but does not operate normally, make note of which functions are affected.  If some LEDs either never turn on or always stay on, make note of their specific locations on the scoreboard.  Refer to the COMPONENT REPLACEMENT section of this manual before changing parts.

COMPONENT REPLACEMENT

LED digits 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 19 shows the components of a LED digit assembly.

Figure 19  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 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 circuit board.
5. Align the mounting holes in the circuit board with the threaded studs on the mask and install the replacement digit on the mask.
6. Refer to figure 20 in order to plug the ribbon cable IDC connector onto the circuit board in the proper orientation.

Figure 20  LED Digit Ribbon Cable Connection Diagram

All other components are located behind the rear access panels.  Figure 21 shows the view behind the upper access panel.

Figure 21  Upper Access Panel Components

Note:  All other LDM12 jacks are unused.

LED Driver Module Replacement

Electrical connections to the LDM12 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 LDM12 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 22 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 22  LPS5 Fuse Locations

LPS5 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 LDM12 LED driver module and the LED digits.

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 23 shows the view behind the lower access panel.

Figure 23  Lower Access Panel Components

Note:  All other jacks are unused.

LX Driver Board Replacement

Electrical connections to the LX LED DRIVER BOARDS are made with ribbon cable polarized IDC sockets and locking ramp crimp terminal housings that mate with jacks on the circuit board.  The circuit board is secured inside the scoreboard on a metal bracket with two hex nuts.

1. Unplug the electrical connections from the circuit board.
   1. Remove the two hex nuts.
   2. Remove the circuit board from the scoreboard.
   3. Insert the replacement circuit board on the metal bracket in the scoreboard.
   4. Secure the circuit board with the two hex nuts.
   5. Insert the plugs into the jacks on the circuit board.

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

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 24 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 24  LPS6 Fuse Locations

LPS6 FUSES

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