condenser C208 is charged with an electric charge. Charging the C208 will be saturated at
50ms. After that, when DEV CHG terminal becomes "L", Q204 turns ON, and the electric charge
charged to the C208 is released. This electric charge becomes a constant voltage at ZD203, and
Developing(+) BIAS(+220V) is output from DEV(+) BIAS.
7.12.3. TRA(+) BIAS (Transfer(+) BIAS)/TRA(-) BIAS (Transfer(-) BIAS) UNIT
When the CHG REM terminal is "L" and the TRA CLK terminal is "Open", Transfer(-) BIAS(-
1200V) is output from TRA OUTPUT the moment Charge BIAS(-1200V) is output from CHG
OUTPUT. When 8KHz PWM (pulse-width modulation) signal is input to the TRA CLK terminal,
Q101 turns ON by MC101, and TRA(+) CURRENT BIAS according to the PWM signal is output
from TRA OUTPUT. The PWM signal will be turned to a constant voltage by the resistor and the
condenser, and input to the MC101. The MC101 compares this voltage with the feedback voltage
from T101 and controls the Q101. As for the transfer current, +30 A is output when DUTY of
the TRA CLK input signal is 0%, or +4 A is output when that is 70%.
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