Service manual

Circuit Description
3-37
3-8 SMPS (Switching Mode Power Supply) Unit.
3-8-1 SMPS Specifications
The SMPS (Switching Mode Power Supply) Unit used here is a PWM (Pulse Width Modulation) type power
supply unit that supplies DC+5V to controller and control panel, and DC+5V, DC+24V and DC+12V to the
engine. It also supplies AC power to fixer heat lamp.
No. Output Channel Ch.1 Ch.2 Ch.3
1
Channel Name +5.1V +24.0V +12.0V
2
Rated Output Voltage +5.1V +24.0V +12.0V
3
Rate Output Current 2A 2.5A 0.8A
4
Maximum Load Current
and Load Pattern
2.5A Continued 3.0A Continued 0.8A Continued
5
Load Change Range 0.5~2.0A 0.1~0.3A 0.1~0.8A
6
Rate output voltage
(For rated I/O)
+5.1V±5%
(+4.84~+5.35V)
+24.0V±10%
(+21.60~+26.40V)
+12V±5%
(+11.40~+12.60V)
7
1) Total Output Voltage
Deviation
(Input, Load, Temp., Aging)
2) Dynamic Input Change
3) Dynamic Load Change
Including All
+5.1V±5%
(+4.84~+5.35V)
Including Set Error
Including All
+24.0V±10%
(+21.60~+26.40V)
Including Set Error
Including All
+12V±5%
(+11.40~+12.60V)
Including Set Error
8
Refer to ripple & noise 27 150mVp-p or less 500mVp-p or less 200mVp-p or less
9
Refer to load short and
overload protection 23
Refer to load short and
overload protection 23
Must not ignite or
generate smoke
when output shorted
for 5 sec.
Output voltage must
shutdown withing
the range of
3.5A~6.5A
Must not ignite or
generate smoke
when output shorted
for 5 sec.