Epson LX-850 Specifications Page 49
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REV.-A
2.2.1.3
+24V
DC Power Supply Circuit
The incoming AC +
26V
is full-wave rectified by diode bridge DB 1, generating a DC voltage of about
36V.
This voltage is converted by the switching regulator
(uPC494C)
to
+24V
DC.
Figure 2-14 illustrates the circuit design.
+4
DB1
RBA-
406B
26VAC
INPUT
~
.--1
I
ZD1 ,
HZS ,
20-2
F2
MQ1-3.
15A
~
:
c 1:%4
R17
F
6.1 K -
cl
6800U
6
50V
12 cl
Vcc
7
—
GND
C4
oc RT CT
4?;
K
o
3
O.o?p
film
*R2
0.1 2W
e
+24vDC
k
;6
!200#
15V
+
GP
Figure 2-14.
+24V
DC Power Supply Circuit
Rectifier And Smoothing Circuit
When the AC +
26V
is full-wave rectified by diode bridge DB 1, and the result is smoothed by the action
of electrolytic capacitor C 1, a voltage of about +
36V
DC is generated. This voltage, after passing
over-current protector fuse F2, is supplied to transistors Q4 and Q 1.
When the power comes on, the potential at the collector side of
Q4
increases. When the voltage reaches
about 20V, Zener breakdown occurs at ZD 1, so that a potential difference is generated between the
collector and base of Q4. This causes
04
to come ON, so that an operating bias is supplied to the
switching regulator.
Note that because the switching regulator does not begin to operate immediately following power on,
Q 1 will also remain off during this time, so that the
+36V
input will not be output to the
+24V
line.
26VAC
36VDC
4
DB
1
FIBA-
406B
INPUT
MQ 1-3. 15A
C)4
Cl 384
R17
+
5.1 K
13A
Frb’+a*b
L,
a c RT CT
I;t
1;-
D
.T.
C R. O F. 8 lh-
1~+
II
1
1
Q
I
AAM
+24V
VDC
1
1
1
I
I
1
1
I
Figure 2-15. Rectifier and Smoothing Circuit
2-13
- LX-810/850 1
- PRECAUTIONS 3
- REVISION TABLE 5
- TABLE OF CONTENTS 6
- CHAPTER 1 7
- GENERAL DESCRIPTION 7
- FEATURES 9
- Hardware Specifications 11
- Si_k&lL 12
- Figure 1 14
- Cut-Sheet Printing Area 14
- 3mm min 16
- Printing Columns 19
- See Table 1-10 19
- 1.3 INTERFACE OVERVIEW 20
- 1.4.1 DIP Switch Settings 23
- SELECTYPE 24
- FUNCTION 24
- TEAR-OFF 25
- FUNCTION 25
- 1.8 OPERATING INSTRUCTIONS 26
- 1.8.3 Buzzer Operation 28
- Beeps indefinitely until 28
- 1.6 MAIN COMPONENTS 30
- Control Panel 31
- 1.6.5 Housing 33
- 1-15. Housing 33
- CHAPTER 2 34
- PRINCIPLES OF OPERATION 34
- 2.1 OVERVIEW 37
- Optional 38
- Interface 38
- && 40
- <o—————u 41
- ‘Usir+km+=l 44
- ● EEPROM 45
- ● Power supply circuit 45
- 2.2.1.1 TA Filter Unit 47
- Figure 2-13 48
- 12V DC Power Supply Circuit 48
- Frb’+a*b 49
- Feedback Circuit 51
- Im_IL’’’’ompara’or 53
- UPC494C 54
- 2.2.2 Reset Circuit 56
- Power-off Reset 57
- : Driving Pulley 58
- PD78 10HG 59
- Figure 2-27. SLA7020M Circuit 61
- ““’’’-r’”’ 63
- Table 2-3. Reference Voltage 64
- ON then 66
- ON to IOFF 66
- ON increases 67
- D voltage reaches the 67
- D voltage 67
- C Phase D 68
- -f-e’’Jw-JL&aau 69
- --JvLODJm-J_ 70
- @~{’aperTe~~~~~~~con.ear 71
- ~>TractOrReductiOn 72
- Printhead 75
- This section describes the 75
- operation 75
- $:q:&J1-n—rL 78
- Figure 2-48 79
- 2.2.6 Host Interface 80
- 2.2.8 Ribbon-feed Mechanism 82
- CHAPTER 3 83
- OPTIONAL EQUIPMENT 83
- Cat. No 85
- X-ON/X -OFF 86
- 3.2 CUT SHEET FEEDER C80612* 88
- (0.0039 inches) 89
- 8.5mm(0..33”) 90
- Cut Sheet Feeder Mode 92
- E#j’::::d/w 93
- ‘. . . 94
- E-ring (6) 95
- Figure 3-7. E-Ring Removal 96
- PULL TRACTOR 100
- (@-ring’” 102
- Marks to ‘be Matched 103
- CHAPTER 4 104
- DISASSEMBLY, ASSEMBLY, AND 104
- ADJUSTMENT 104
- LIST OF FIGURES 104
- LIST OF TABLES 106
- JiMwf!3a 108
- DISASSEMBLY AND REASSEMBLY 109
- Casing Removal -1 111
- 4.2.2.2 113
- 3. Remove 115
- (M3 X 6) 115
- Removal of Printer Mechanism 116
- Remove the GND spring 117
- PaDer Guide 118
- Frame (R) 122
- Flat Spring 124
- Shaft Ground 125
- NOTES FOR REASSEMBLY: 129
- Home Position Sensor 130
- NOTES FOR REASSEMBLY 132
- CHAPTER 5 135
- TROUBLESHOOTING 135
- 5.1 GENERAL 136
- UNIT REPLACEMENT 136
- (5) Abnormal Control 143
- UNIT REPAIR 145
- Check point 148
- Solution 148
- Problem Symptom 150
- Symptom Cause 152
- Check point Solution 152
- Printer Mechanism Repair 153
- ● Replace the 154
- 6.1 PREVENTIVE MAINTENANCE 157
- APPENDIX 160
- /APD7810HG 163
- <,”> 165
- (AD7-0) 166
- A.1.2 E05A30 (3B) 168
- SRAM (3D) 170
- A.1.5 SLA7020M (1A) 172
- A.1.6 pPC494C (3A) 173
- A.2 EXPLODED DIAGRAMS AND 174
- SCHEMATICS 174
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