Dc Power Supply - Ricoh M5 Service Manual

– DC Power Supply –
This copier uses two dc power levels: +5 volts and +22 volts.
The 29.5 Vac input from the transformer is rectified by DBA20B.
smoothes the output and amplifies the potential to +22 volts.
components that have a relatively large current requirement, such as the power packs and solenoids.
The 9 Vac input from the transformer is rectified by a diode bridge (D 1 to D4). A voltage regulator
(IC2) smoothes the output and reduces the potential to +5 volts. This +5 volt output powers the
CPU, thermistor, and sensors.
The chopper-stabilized amplifier
This +22 volt output drives the dc
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May, 25, 1985