Canon PC400 Service Manual - Page 69

Operations in Measurement Mode, Operations during Copying

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CHPTER 4 IMAGE FORMATION SYSTEM 2. Operations a. Operations in Measurement Mode HVTDC=1, DCTPWM=0 Oscillation circuit goes ON. Constant current control circuit generates 'ON'. TREV=1 Measurement mode is selected, applying a constant current to the transfer charging roller. Positive bias control circuit goes OFF. High-voltage transformer/rectifier circuit goes OFF. In measurement mode, the current is monitored by the current sensor circuit so that the constant current control circuit can control it to a constant current. Further, the microprocessor monitors the internal resistance of the transfer charging roller in terms of voltage using the auxiliary winding of the transformer (T107). b. Operations during Copying HVTDC=1, DCTPWM=1 Oscillation circuit goes ON. Pulse/DC converter circuit goes ON. Voltage control circuit goes ON. TREV=1 Positive bias control circuit goes OFF. Multiplier/rectifier circuit goes OFF. High-voltage transformer (T107) goes ON to apply a negative DC bias to the transfer charging roller. COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-11

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COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHPTER 4 IMAGE FORMATION SYSTEM
4-11
2.
Operations
a.
Operations in Measurement Mode
HVTDC=1, DCTPWM=0
Oscillation circuit goes ON.
Constant current control circuit generates ‘ON’.
Measurement mode is selected,
applying a constant current to
the transfer charging roller.
TREV=1
Positive bias control circuit goes OFF.
High-voltage transformer/rectifier
circuit goes OFF.
In measurement mode, the current is monitored by the current sensor circuit so that
the constant current control circuit can control it to a constant current.
Further, the microprocessor monitors the internal resistance of the transfer charging
roller in terms of voltage using the auxiliary winding of the transformer (T107).
b.
Operations during Copying
HVTDC=1, DCTPWM=1
Oscillation circuit goes ON.
Pulse/DC converter circuit goes ON.
Voltage control circuit goes ON.
High-voltage transformer (T107)
goes ON to apply a negative DC
bias to the transfer charging
roller.
TREV=1
Positive bias control circuit goes OFF.
Multiplier/rectifier
circuit goes OFF.