Service manual

Possible Solutions:
a. Check the voltage outlet. Confirm that the outlet is supplying 115 volts.
b. Confirm that you are not testing the scoreboard with the board lying on
its back. The board must be upright to operate correctly.
c. Check the 14V power supply on the control board, see page 7-9.
d. Manually move the individual segments back and forth several times to
confirm that no foreign matter is “jammed” into the digit bearings. Wipe
the digit bearing and magnet spotless using a clean, dry cloth, see Fig. 40
on the previous page.
Note: Never apply lubricants of any kind onto the digit bearings.
e. If your scoreboard operates on a battery, check the battery voltage.
Since the problem may be that the battery is overloading the power sup-
ply, “bypass” the battery by unplugging the battery connection on the con-
trol board. Try operating the scoreboard on AC power only.
To remove one individual segment, place your index finger under the vane
and your thumb on top of the vane. Pull straight up.
Note: Placing a thumb and index finger of your other hand at the
end of the shaft next to the bearings will prevent the bearings
from falling off, see Fig. 40 on the previous page.
To clean, after removing the rotor, inspect the magnet and armature for
small particles of dirt. Remove any foreign matter.
To install bearings on axle properly, seat bearings on “U” shaped groove.
Push down until a “click” is heard. Check for proper seating of bearings
and free movement of vanes, see Fig. 41 below.
Figure 41
Note: Each digit segment is weighted differently. Do not switch
segments around.
The control board flips numbers “ON” and “OFF” by pulling current
through magnetic coils under each segment. These coils can be tested with
a common multimeter, adjusted to the OHMs’ setting. The resistance
between the left sides of any odd numbered diode (see Fig. 44, page 7-10)
and the diode directly below it, should be approximately 80 to 85 OHMs.
For example, with the multimeter probes on the left side (no stripe) of
diodes #13 and #14, the meter reads 84 OHMs within the acceptable
range.
Segment Repair and
Maintenance
Testing Digit Coils
7-6
One or more segments operate intermittently.