Dell 2355DN Service Manual page 30

■ SMPS (Switching Mode Power Supply)
It is the power source of entire system.
It is consisted of the SMPS part, which supplies the DC power for driving the system, and the AC heater
control part, which supplies the power to fuser. SMPS has two output channels. Which are 5V and +24V.
• AC Input
- Input Rated Voltage: AC 110V ~ 127V / AC 220V ~ 240V
- Rated Frequency : 50/60 Hz
• Rated Output Power
NO ITEM
1 CHANNEL NAME
2 CONNECTOR PIN
3 Rated Output
4 Max. Output Current
5 Peak Loading Current
6 RIPPLE NOISE Voltage
7 Maximum output
8 Protection for loading
shortage and overflowing
current
■ FUSER AC POWER CONTROL
Fuser(HEAT LAMP) gets heat from AC power. The AV power controls the switch with the Triac, a
semiconductor switch. The 'ON/OFF control' is operated when the gate of the Triac is turned on/off by
Phototriac (insulting part).
In other words, the AC control part is passive circuit, so it turns the heater on/off with taking signal from
engine control part.
• Triac feature : 16A-LV model / 12A-HV model, 600V SWITCHING
• Phototriac Coupler (PC501)
- Turn On If Current : 15mA ~ 50mA(Design: 16mA)
- High Repetive Peak Off State Voltage : Min 600V
Service Manual
Product spec and feature
CH1
+5V
CON 3
5V PIN: 11,13
GND PIN: 12,14,16
+5V ± 5%
(4.75 ~ 5.25V)
3A
3.6A
100mVp-p
15W
Shut down or Fuse
Protection
2-21
CH2
+24.0V
CON 3
24V PIN:3,5,7,9
GND PIN:4,6,8,10
+24V ± 10%
(21.6 ~ 26.4V)
4.0A
10.0A
Under 500mVp-p
96W
Shut down or Output
Voltage Drop
Remark
1ms