Page 136 - Twilight Zone

Power
1- ~
General Illumination Circuit
POWER DRIVER BOARD
DrIve VCC
J113
51 n
J115
S.B
x!-----q
G.I. Lights
~----~Xl--~----------~
Block Diagram of General Illumination Circuit
rp;;;-r
, Driver ,
, Board ,
,- Playfteld 0-;-'
I Backbox. ,
I Up to 18 bUlbs.,
I ,
I I
6.3 volt secondary
Zero Cross Detection
Circuit
Power Driver Board
5 volt secondary
Microprocessor
CPU Board
When point "A" toggles low, then points "B" and "C" are high. This turns On the triac and the desired
General Illumination string lights.
Twilight Zone 3-10