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.  All other components are located behind the rear access panels.

LED Digits And Indicators Replacement

The LEDs that form digits and indicators 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 and indicators.  Figure 13 shows the components of a LED digit assembly.  LED indicator assemblies are similar in construction.

Figure 13  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 14 in order to plug the ribbon cable IDC connector onto the circuit board in the proper orientation.

Figure 14  LED Digit Ribbon Cable Connection Diagram

1. Reinstall the assembly using the sheet metal screws.
   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 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.

Single Segment Driver Board Replacement

All other components are located behind the rear access panels.  Figure 15 shows the view behind the lower access panel.

Figure 15  Lower Access Panel Components

LDM20 LED DRIVER MODULE FUNCTIONS

Note:  All other LDM20 jacks are unused.

LED Driver Modules Replacement

Electrical connections to the LED DRIVER MODULES 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 four machine screws.

1. Do not cut the plastic tie wraps around the ribbon cables.
   1. Remove the four screws.
   2. Remove the module from the scoreboard.
   3. Insert the replacement module in the scoreboard.
   4. Secure the module with the four 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 LDM20 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 16 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 16  LPS5 Fuse Locations

LPS5 FUSES

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

LED Power Supply Modules Replacement

Electrical connections to the LED POWER SUPPLY MODULE are made with keyed plugs that mate with jacks on the left side of the module.  The module is secured inside the scoreboard with four machine screws.

1. Disconnect the plugs from the four jacks on 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.

Figure 17 shows the view behind the upper access panel.

Figure 17  Upper Access Panel Components

LDM18 LED DRIVER MODULE FUNCTIONS

 Note:  All other LDM18 jacks are unused.

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 Bottom Section.  Figure 18 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 18  LPS6 Fuse Locations

LPS6 FUSES

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

The LED Power Interface board distributes the output from the LPS6 LED power supply module to the LDM18 LED driver module and some 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.