Repair manual

2-14
THEORY OF OPERATION
Table 2-1. DC Power System (Con't)
Connector Output Voltage Function
J51 (Con't) +12V_LB This dc output voltage powers the following
on the Logic Controller P.C. Board:
o Video Generation circuit (Sheet 4)
(Pixel Clock frequency Synthesizer).
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).
o Filter wheel stepper motor circuit via
connector J6 (Sheet 5).
J52 -12V_A This dc output voltage powers the following
on the Monitor P.C. Board:
o Luminance circuit.
o Vertical deflection circuit (S-Distortion
Correction, Height, Center, and Driver).
o COS4 exposure correction circuit.
+12V_B This dc output voltage powers the following
on the Monitor P. C. Board:
o CRT Cathode Driver Circuit.
o Luminance circuit.
o Vertical deflection circuit (S-Distortion
Correction, Height, Center, and Driver).
o COS4 exposure correction circuit.
CBVCC (+5vdc) This dc output voltage powers the camera
back drive motor circuit via connector J11
on the Logic Controller P.C. Board.
J53 -12V_B This dc output voltage is not used.