Epson FX 1170 Service Manual - Page 64
Primary, Secondary, Power Supply Circuit Block Diagram
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REV.-A Primary Full Wave Rectification Circuit - Smoothing Circuit 9Filter Circuit AC input I I I I Secondary 1 I 1 1 I 1 Switching ; Smoothing < Circuit II1 Circuit 1 m I 1 1 I +5 v 1 1 Switching . 1 Regulator l------ 1 I 1 +5V 1 I Over Current I I I Control Circuit 1 I +5V 1 1 Over Voltage I 1 Control Circuit 1 t 1 I 1 ZD51 Photo- + coupler +35 V Line Detector Circuit . 4 + 3 5 VDC + +5 VDC I I { Photo- + coupler - 8A 1 1 1 1 I 1 1 1 1 1 I I t t I I I I I I I I 1 I I I I - 1 t 1 1 1 1 +5 V Line Voltage Overload Protection Circuit +35 V Line Voltage Drop Protection Circuit ZD53 - ~ Switch Figure 2-22. Power Supply Circuit Block Diagram 2-21
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REV.-A
I
I
Primary
I
I
1
I
1
Secondary
1
I
1
Full Wave
Rectification
—
Smoothing
Switching
;
Smoothing
<
Circuit
Circuit
Circuit
I
Circuit
I
1
1
m
9
Filter Circuit
AC input
I
1
1
I
1
1
1
l------
1
I
1
1
I
I
I
I
1
I
1
1
I
1
1
t
1
+5
v
Switching
Regulator
. . . . . . . . . . . . . . .
.
+5V
Over Current
Control Circuit
----..-
.....
----
+5V
Over Voltage
Control Circuit
I
1
ZD51
Photo-
+35 V Line
coupler
+
Detector Circuit
I
8A
1
1
1
1
I
1
1
1
1
1
I
I
t
t
I
I
I
I
I
I
I
I
1
I
I
I
I
1
t
1
1
1
1
I
{
+5 V Line Voltage
ZD53
Photo-
+
Overload
coupler
Protection Circuit
-
—
.
—
+35 V Line
Voltage Drop
Protection Circuit
.
4
+35
VDC
+
+5
VDC
~
Switch
Figure 2-22. Power Supply Circuit Block Diagram
2-21