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EPSON Stylus Color 900 Revision C
Operating Principles Electrical Circuit Operation Principles 58
Figure 2-10. C265 PSB/PSE Board Circuit Block Diagram
L
N
F1
R1
C1
TH1, TH2
L1 C3,C4
C2
DB1
C
T1
Q1
PC1
Q2
Q3
+42V/0.8A
GP
+42
+42
+42
GP
ZD 51,
ZD 81-86
C 51,52
+5V/1.5A
GL
+5
PSC
+5
+5
GL
7
L51
OSC
5
C54
+
ZD53
ZD52
ZD87
L4960
(IC51)
1
In
Q84
C84
+
Out
R28
300 K
Q31
C13
+5 V Regulator
D51
Incom ing current protection
H igher harm onics absorption
Sm oothing
F u ll w a v e re c tific a tio n
Inrush current tem perature conversion
Starting resistor
H igher harm onics absorption
Sm oothing
5V line overvoltage protection
Sm oothing
42 V line constant voltage control
42 V line overvoltage protection
Voltage drop delay circuit at power off
C om es on when abnorm al.
Photo C oupler
Feed
back
Main
S w itc h in g
Feed
b a c k