Epson 440 User Manual Page 71
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- Table of contents
- TROUBLESHOOTING
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EPSON Stylus Color 440/640/740 Revision A
Chapter 2 Operating Principles 71
2.2.4.4 Timer Circuit
A lithium battery is mounted on the main board and calculates how long
the printer is not used. The timer IC starts counting with oscillation
motivated by the crystal oscillator using this battery as a power source.
The following figures show connection of the Timer circuit. The
followings explain about operation of this circuit.
When the printer is on, power is supplied to the Timer IC by
applying +5V quickly through the D1.
This power is also used for the power to oscillator. The
oscillation wave form is input to XI terminal.
Since the oscillation wave form of CR1 is analog wave form, it is
processed into the pulse form in the Timer IC.
When the printer is turned on, the Timer IC outputs power off
time as serial data to the gate array.
Once the printer is turned off, 3VDC of BAT1(lithium battery) is
supplied as power source for the Timer IC through D7.
Since +5V at the power on is higher than +3V of the lithium
battery, the power is not being consumed from the lithium
battery.
Figure 2-29. Timer Control Circuit for Stylus Color 440
Figure 2-30. Timer Counter Circuit for Stylus Color 640
Figure 2-31. Timer Counter Circuit for Stylus Color 740
+5
Batt1
D7
D1
C4
0.1u
S-3510ANF
(IC5)
XI
XO
2
3
VCC
GND
8
4
5
6
7
123
121
124
CR1
E05B44
(IC2)
TCE
TCLK
TDATA
RM7
CS
/SCK
/SIO
+5
Batt1
D1
D4
C4
0.1u
S-3510ANF
(IC10)
XI
XO
2
3
VCC
GND
8
4
5
6
7
125
123
126
CR3
E05B43
(IC2)
TCE
TCLK
TDATA
RM7
CS
/SCK
/SIO
+42
RTC-9810
(IC8)
Vin
9
7
8
5
6
4
CE
SCLK
Data
Vdd
Vbk
GND
20
21
23
E05B588
(IC2)
TMCS
TMCK
TMDATA
/RST
2
25
+5
14
Batt1
- 1
- PRECAUTIONS 3
- REVISION STATUS 5
- Product Description 6
- Operating Principles 6
- Troubleshooting 6
- Disassembly and Assembly 6
- Appendix 7
- PRODUCT DESCRIPTION 8
- 1.1 FEATURES 9
- 1.2 Specifications 11
- 1.2.2 Paper Specification 15
- 1.2.2.4 Index Card 16
- 1.2.3 Printing Area 17
- 1.2.3.1 Adjust Lever Setting 19
- [Black Ink Cartridge] 20
- [Color Ink Cartridge] 21
- 1.2.6 Electric Specification 23
- 1.2.7 Reliability 23
- 1.2.8 Safety Approvals 23
- 1.2.9 Acoustic Noise 24
- 1.2.10 CE Marking 24
- 1.2.11 Input Data Buffer 24
- 1.3 Interface 25
- Table 1-13 29
- 1.4 Control Panel 32
- 1.4.2 Panel Functions 33
- 1.5 Error Status 35
- 1.5.4 No Ink-Cartridge 36
- 1.5.5 Maintenance Request 36
- 1.5.6 Fatal Errors 36
- 1.6 Printer Initialization 37
- 1.7 Initialization Settings 37
- 1.8 Main Components 38
- 1.8.5 Power Supply Board 40
- OPERATING PRINCIPLES 42
- 2.1 Overview 43
- 2.1.1 Printer Mechanism 44
- 2.1.1.1 Printing Mechanism 45
- 2.1.1.2 Printing Process 46
- 2.1.1.3 Carriage Mechanism 47
- Eject Roller 48
- Paper guide(Front) 48
- [Previous] 51
- [Stylus Color 440,640,740] 51
- 2.1.1.5 Ink System 52
- CW Rotation 54
- CCW Rotation 54
- AC Input 56
- TRANS(T1) 57
- C206 PNL 60
- Transceiver 62
- (IC16) 62
- C209 PNL 64
- 2.2.4.4 Timer Circuit 71
- 2.2.4.5 DRAM Control 72
- TROUBLESHOOTING 81
- Stylus Color 640: C256Main 82
- Stylus Color 740: C257Main 82
- Chapter 3 Troubleshooting 83 83
- Chapter 3 Troubleshooting 84 84
- Chapter 3 Troubleshooting 85 85
- 3.2.2 Error is detected 86
- Chapter 3 Troubleshooting 87 87
- Chapter 3 Troubleshooting 89 89
- Chapter 3 Troubleshooting 90 90
- Chapter 3 Troubleshooting 91 91
- The Main 91
- Chapter 3 Troubleshooting 92 92
- Chapter 3 Troubleshooting 93 93
- Chapter 3 Troubleshooting 94 94
- Chapter 3 Troubleshooting 95 95
- Chapter 3 Troubleshooting 96 96
- Chapter 3 Troubleshooting 97 97
- Chapter 3 Troubleshooting 98 98
- DISASSEMBLY AND ASSEMBLY 99
- W ARNING 100
- 4.1.2 Tools 101
- 4.2 Disassembly Procedures 104
- 4.2.1 Removing the Housing 105
- ADJUSTM ENT 106
- REQUIRED 106
- Printhead U nit 110
- Fastener H ead 110
- (N o .4 ) 112
- Absorber Tray Assem bly;A 112
- Pump Assembly 114
- Cap Assembly 114
- Head Cleaner 115
- Order of assembling 115
- PF M otor Assem bly 118
- H P D e te c to r 128
- ADJUSTMENT 129
- 5.1 Overview 130
- Chapter 5 Adjustment 131 131
- 5.2 Adjustment 132
- Chapter 5 Adjustment 133 133
- Chapter 5 Adjustment 134 134
- Maintenance 135
- Adjustment 135
- A4 Check 135
- Pattern 135
- M S-D O S Prom pt-S C 640 136
- Is the m odel nam e correct? 137
- Starting SERVICE PROGRAM 138
- N o te : 139
- Transportation Liquid C harge 140
- H ead cleaning 140
- Chapter 5 Adjustment 141 141
- Maximum is 19,800 points 142
- Esc: Previous 142
- Chapter 5 Adjustment 144 144
- Chapter 5 Adjustment 146 146
- W riting to EEPROM now 147
- Esc: Previous 147
- M S-D O S Prom pt-SC 640 148
- Chapter 5 Adjustment 149 149
- Chapter 5 Adjustment 150 150
- Left Gap 152
- Right Gap 152
- MAINTENANCE 153
- 6.1 Overview 154
- 6.1.3 Lubrication 155
- Chapter 6 Maintenance 156 156
- Chapter 6 Maintenance 157 157
- Chapter 6 Maintenance 158 158
- Chapter 6 Maintenance 159 159
- APPENDIX 160
- A.1 Connector Summary 161
- Chapter 7 Appendix 162 162
- Chapter 7 Appendix 163 163
- Chapter 7 Appendix 164 164
- Chapter 7 Appendix 165 165
- Chapter 7 Appendix 166 166
- Chapter 7 Appendix 167 167
- Chapter 7 Appendix 168 168
- A.2 EEPROM Address Map 169
- Chapter 7 Appendix 170 170
- Chapter 7 Appendix 171 171
- Chapter 7 Appendix 172 172
- Chapter 7 Appendix 173 173
- Chapter 7 Appendix 174 174
- Chapter 7 Appendix 175 175
- Chapter 7 Appendix 176 176
- Chapter 7 Appendix 177 177
- Adjusted at factory 177
- Chapter 7 Appendix 178 178
- Chapter 7 Appendix 179 179
- Chapter 7 Appendix 180 180
- Chapter 7 Appendix 181 181
- Chapter 7 Appendix 182 182
- Chapter 7 Appendix 183 183
- Chapter 7 Appendix 184 184
- Chapter 7 Appendix 185 185
- Chapter 7 Appendix 186 186
- Chapter 7 Appendix 187 187
- A.4 Exploded Diagrams 188
- Chapter 7 Appendix 189 189
- Chapter 7 Appendix 190 190
- Chapter 7 Appendix 191 191
- Chapter 7 Appendix 192 192
- REV.1.0 10002 193
- REV.1.0 10002 194
- Chapter 7 Appendix 195 195
- Chapter 7 Appendix 196 196
- Rev.01 10004 197
- A.5 Part List 198
- Part List 198
- Chapter 7 Appendix 199 199
- A.6 Circuit Diagrams 202
- See the hard copy 203
- Chapter 7 Appendix 208 208
- Chapter 7 Appendix 209 209
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