Early Bally Solenoid Driver/Voltage Regulator Board Test Points
TP1 = +5 VDC (upper right side)
TP2 = +190 VDC, Out to displays (upper left)
TP3 = +5 VDC (middle right edge)
TP4 = +230 VDC, In for displays (upper left, just next to TP2)
TP5 = 11.9 VDC (upper right side, just above TP1)
TP6 = Jump to base of driver transistor (Qn) to activate solenoid (lower right)
TP7 = Jump to base of transistor driver (Un) to deactivate energized solenoid (lower right edge)
GND = ground (center)
Notes:
These test points also apply to Stern boards from the same period.
Acceptable tolerances are generally within 5-10%. Most voltages are usually
on the high side. If TP2 is high it may prematurely burn out your
displays. If TP2 is low, and your displays look bright and flicker-free,
then your displays will likely last longer. If TP5 is on the low side the
MPU may not boot.
New tips are welcome and encouraged. Tips will be credited to those who
contribute. If you would like to submit a tip click
here.
For more information you may contact us by email, email form, or by phone at (801) 277-0888.
