SERVICING THE SHOT TIMER

While your shot timer 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 shot timer model number when calling.  Shot timer 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 Replacement

The LEDs that form digits are soldered on circuit boards mounted behind the metal mask.  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 shot timer when removing or replacing LED digits.  Figure 6 shows the components of a LED digit assembly.

Figure 6  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 7 in order to plug the ribbon cable IDC connector onto the circuit board in the proper orientation.

Figure 7  LED Digit Ribbon Cable Connection Diagram

All other components are located behind the face panel.  Figure 8 shows the view behind the face panel.

Remove the LED digit assemblies.  Remove the face panel to access the shot timer electronics.  The panel is held in place by several hex head sheet metal screws.  Remove the screws and disconnect the ribbon cables that are connected to the rear side of the LED digit printed circuit boards.  Figure 8 shows the layout of the shot timer electronics behind the front panel.

Figure 8  Shot timer Electronics

The LDM1 LED DRIVER MODULE operates the game clock functions.  The LDM4 LED DRIVER MODULE operates the shot timer.  The LPS-175VA POWER SUPPLY MODULE provides power to all the shot timer electronics.  The SURGE SUPPRESSOR is used for surge protection.

Horn Replacement

1. Remove the machine screws and nuts that fasten the horn to the bottom of the cabinet.
2. Pull the horn assembly out of the shot timer and cut the two wires leading up to the rear of the horn assembly.
3. Splice the new horn assembly wires to the two wires inside the shot timer.
   1. Install the horn assembly and fasten it to the shot timer face using the machine screws and nuts.

LDM4 LED DRIVER MODULE FUNCTIONS

LED Driver Module Replacement

Electrical connections to a 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 shot timer 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 shot timer.
   3. Insert the replacement module in the shot timer.
   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 shot timer when removing or replacing it.

LPS-175VA LED POWER SUPPLY MODULE FUNCTIONS

Figure 9 shows the location of the fuses in the LPS-175VA  LED Power Supply Module.  The table following the figure lists the fuse ratings, functions, and part numbers.

Figure 9  LPS-175VA POWER SUPPLY MODULE LPS-175VA FUSES

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

LED Power Supply Module Replacement

Electrical connections to the LPS-175VA 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 shot timer with two machine screws.

1. Disconnect the plugs from the jacks on the module.
2. Remove the two machine screws.
   1. Remove the module from the shot timer.
   2. Insert the replacement module in the shot timer.
   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 shot timer when removing or replacing it.

Surge Suppressor Replacement

The Surge Suppressor suppresses electrical surges.  Electrical connections to the Surge Suppressor are made with ¼” quick disconnects that mate with ¼” tabs on the top of the unit.  It is secured inside the shot timer with one machine screw.

1. Unplug the electrical connections from the Surge Suppressor.
   1. Remove the screw.
   2. Remove the unit from the shot timer.
   3. Insert the replacement Surge Suppressor in the shot timer.
   4. Secure the unit with the screw.
   5. Figure 10 shows the top view of the Surge Suppressor.

Figure 10  Surge Suppressor Terminals