User manual

95.08.23.11.29
Color LaserWriter 12/600 PS Basics & Theory 1–62
For the initial rotations, IC1003 sets the
/HV1DC1 signal to “L” and the
/HV1DC0 signal to “L” to apply between-colors bias/between-pages bias
to the primary charging roller. Then, the
/HV1DC1 signal goes “L” and
the
/HV1AC1 signal goes “H” so that the primary charging roller is
charged with the print bias with the primary charging voltage AC bias
and DC bias being superimposed. For between-colors/between-pages,
the
/HV1AC1 signal is set to “H” and only the DC bias is applied, with
the AC bias turned off.
DC Voltage
Circuit
Generation
Integral
Circuit
Voltage
Conversion
Circuit
Voltage
Detection
Circuit
IC1003 (High-Voltage Control IC)
Primary Charging Roller Voltage Generation Circuit
Constant Voltage Circuit
Mechanical Controller Board
/HV1PWM
Switching
Circuit
Sign Train
Circuit
Generation
Amplification
Circuit
AC Voltage
Generation
Circuit
Current
Detection
Circuit
Voltage
Selection
Circuit
Voltage
ON/OFF
Circuit
Constant Current
Controller Circuit
Overlapping
Primary
Charging
Roller
/HV1DC0
/HV1DC1
HVFre1
HVFre2
/HV1AC1
/HV1AC0
HVFre 1, 2 are signals of pulses.
High-Voltage Power Supply