Page 123 - Judge Dredd (Bally)

Flashlamp Circuit
, POWER DRIVER BOARD
Flashlamp
Black-xxx
+ Red-White
Power
___ _ _ 1
The microprocessor toggles the output of the 74LS374. When point "A" is low, point "S" the collector of
the 2N5401 transistor is high. Once point'S" is high. point "C" the collector of the TIP102 transistor is
low. When Point 'C' is low the flash lamp is grounded through the transistor and the flashlamp turns On.
When point 'AN toggles high the circuit shuts Off.
Special (General Purpose) Solenoid Circuit
, POWER DRIVER BOARD
Drive Jt21 ,
x l: Flashlamp'
, or
, Coil
Red-White
~-~~--~X ~,- -+- - - - ---.
L _ _ ---'V\/\r-_ - -f Blue-xxx
J102 F112
J107 '
100 11'
50V
+
Power
The microprocessor toggles the output of the 74LS374. When point "A" drops low, point "S" is high. A
high at point'S' causes a low at point ·C'. When point "C' is low the coillflashlamp is grounded through
the transistor and the coiVflashlamp turns On. When point 'A" toqqles high the coil/flashlamp turns Off .
• Tieback Diode is not used for flash lamp circuit.
Judge Dredd 3-9