Power Supply; Figure 5-13 The Power Supply - Tektronix Phaser 550 Service Manual

Power supply

Filter
Filter
AC

Figure 5-13 The power supply

The low voltage power supply generates five DC voltages:
+5 VDC for the image processor logic. For short protection., a
switching FET in the DC/DC converter monitors the output voltage
and in the event of a short, cuts the voltage off.
+5VDC for the engine control logic. For short protection, the voltage
difference of the choke coil and feedback to the DC/DC converter is
monitored and protected by the DC/DC converter.
+24 VDC for the motors, high voltage board and the cams, clutches
and solenoids. Short protection is provided by detecting the source
current of the main switching FET in the primary side and cutting off
the FET by IC control.
±12 VDC for the image processor, laser diode sensor and op-amps.
Short protection is provided by a regulator IC which reduces the
output current.
Zero cross
switch
Control IC
Regulator IC
Regulator IC
Energy star
mode control
DC-DC
converter
DC-DC
converter
Service Manual
5
Theory of Operation
Fuser halogen
lamp (750W)
+12V
±12VGND
-12V
+24VC
+24VGND
+5VB
(engine logic)
+5VBGND
+5VC
(IP logic)
+5VCGND
9013-22
5-17