Description - Intermec EasyCoder 601 XP Service Manual

14. Power Supply

14.1 Description

Intermec EasyCoder 601 XP – Service Manual Ed. 3
The Power Supply Unit (PSU) is situated in the electronics com-
partment inside the CPU board.
To gain access to the PSU, first 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 centre-line wall by the 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 voltages
in the range of >90 – <240 V AC, 45 – 65 Hz without any manual
switch. The unit delivers 175 W continuously and about 400 W
peak. It has a thermostat-controlled fan and overheating protection
that switches the unit off at too high a temperature.
The PSU consists of the following main parts:
Mains:
90V - 264V AC
45 - 65 Hz
Mains
Booster
Converter
Pulse Width
Modulator
(w. Power Factor Contr.)
CAUTION!
Make sure that the printer is turned 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
Chapter 14
5.3V DC
24V DC
P24V DC
42V DC
P24 Enable
Power Fail
Rectifier 42V
Rectifier 24V
Buck Converter
(24V ⇒ 5.3V)
Control Vout
(24V & 42V)
85