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 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.

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. Plug the ribbon cable onto the header on the back of the circuit board.
7. Reinstall the assembly using the sheet metal screws.

All other components are located behind the access panel.  Figure 14 shows the view behind the access panel.

Figure 14  Access Panel Components

Note:  All other LDM20 jacks are unused.

LED Driver Module Replacement

Electrical connections to the 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 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 15 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 15  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 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.