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3. Power Supply Circuit
A ringing choke converter type circuit is used with a dropper type circuit in the power supply unit, fulfilling the input and
output conditions described in the chart below.
Fig. 2-3 Power Supply unit block diagram
Input
110VAC
120VAC
220VAC
230VAC
240VAC
Noise filter
circuit
In rush current
protection
circuit
Rectifier
circuit
Switching
section
(Transistor Q1)
Ringing
choke
converter
Dropper
circuit
Voltage
reference
Control
circuit
Transformer T1
PC1
Photo-Coupler
Output
33V DC
Output
5V DC
Voltage Range Max. Current Output Service Circuit Type
Input
110VAC, 120VAC 1.0 A
220VAC to 240VAC 0.6 A
5 VDC ±5% 0.4 A Dropper
33 VDC ±5% 1.25A Ringing choke
converter.
For logic circuit
drive, for motor
holding.
For print head
drive, for motor
drive.
Output
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