Description - Intermec EasyCoder 501 XP Service Manual

Chapter 14
14. Power Supply

14.1 Description

86
The Power Supply Unit (PSU) is situated in the electronics com-
partment inside the CPU board.
To gain access to the PSU, fi rst remove the CPU board, which is
held by one #T20 Torx screws to the rear plate (below the RS-232
connector) and one #T10 Torx screw at each of the upper corners.
The PSU is held to the rear plate by two #T20 Torx screws, and to
the center section by two more #T20 Torx Screws accessible from
the media compartment. The PSU is connected by two cables: one
to the CPU board and another to the printhead.
The power supply unit is primary-switched with power correction
factor controller so as to comply with the CE regulations, which
require a sinus-shaped load curve. It is designed for input volt-
ages in the range of >90 to <240 VAC, 45 to 65 Hz without any
manual switch. The unit delivers 175W continuously and about
400W peak. It has a thermostat-controlled fan and an automatic
overheating protection switch.
The PSU consists of the following main parts:
Input:
90-264 VAC
45-65 Hz
Mains
Booster
Converter
Pulse Width
Modulator
(w. Power Factor Contr.)
WARNING!
Make sure that the printer is switched off and that
the power cord is disconnected. The power supply
unit contains high voltage wire and circuits.
Power Supply Board
175W continuous
(400W peek)
Forward
Converter
Pulse Width
Modulator
Forward
Temperature Control
&
Power Fail Interrupt
Intermec EasyCoder 501 XP – Service Manual Ed. 4
5.3 VDC
24 VDC
P24 VDC
42 VDC
P24 Enable
Power Fail
Rectifier 42V
Rectifier 24V
Buck Converter
(24V ⇒ 5.3V)
Control Vout
(24V & 42V)