Service manual

Service Manual 5-15
Theory of Operation 5
Power supply
The printer power supply is a combination power supply. It outputs the following
voltages:
n +5 VDC generated from a chopper system. +5 VDC is used for the digital
logic systems.
n ±12 VDC generated from a flyback converter system. ±12 VDC is supplied
to the image processor board for specialized circuitry.
n +25.5 VDC generated from a pulse-width-modulated (PWM) system. +25.5
VDC is used for the 24 V motors and the thermal head. A control signal
(VHON-0) can switch the thermal head voltage on and off, independently of
the +25.5 provided to the motors.
An externally accessible switch allows you to select from line voltages of 115 VAC and
220 VAC.