Repair manual

2-13
THEORY OF OPERATION
o Optional Daughter Board via connectors J1 and J2 on the Logic Controller
P.C Board.
Figure 2-2 shows the DC Power system. Table 2-1 identifies the output
voltage/voltages for a particular connector/connectors and indicates the
electronic circuitry that it powers.
Figure 2-2. AC/DC Power System Block Diagram
Table 2-1. DC Power System
Connector Output Voltage Function
J51 -12V_LB This dc output voltage powers the following
on the Logic Controller P.C Board:
o Auto luminance (brightness sensor)
circuit (Sheet 7).
o Vertical deflection circuit (Sheet 7).
o Optional Daughter Board (Sheet 5).
o Optional Small System Computer
Interface (SCSI) (Sheet 5).
Logic Controller
P.C. Board
Power Supply
Module
J51
J53J52
Refer to System Interconnection
Wiring Diagram in Section G
for Detail Pin Connections and
DC Power Distribution.
Main Power
ON/OFF Switch
Ground
Power
Receptacle