User manual

95.08.23.11.29
Color LaserWriter 12/600 PS Basics & Theory 1–64
As the density adjustment signal (for the developing bias) (/DEVPWM)
adjusts image density according to density instructions from the
mechanical controller, IC1003 changes the amplitude value of the
developing DC bias and the developing AC bias. The
/DEVPWM signal
varies according to image density correction control and the setting of
the density control panel.
Curve
Forming
Circuit
Switching
Circuit
AC Bias
Generation
Circuit
Voltage
Detection
Circuit
Integral
Circuit
Integral
Circuit
Voltage
Circuit
Detection
Regulator
DC Bias
Generation
Circuit
High-Voltage Power Supply
Mechanical Controller Board
IC1003 (High-Voltage Control IC)
Voltage
ON/OFF
Circuit
Switching
Circuit
Overlapping
Developing Bias Generation Circuit
Developing
Cylinder
Constant Voltage Circuit
Constant Voltage
HVFre3
HVFre1
/DEVPWM
/DEVAVE
/DEVDC
HVFre1
HVFre1, 3 are pulse signals.