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Epson Stylus COLOR 740 Special Edition Service Manual - Page 28

Table 1-12., Parallel I/F Reverse Channel, Pin No., Signal Name, Return GND, In/Out

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EPSON Stylus Color 440/640/740 Revision A Table 1-12. Parallel I/F Reverse Channel Pin No. Signal Name Return GND Pin In/Out Functional Description 1 HostClk 19 I Host clock signal. 2-9 Data0-7 20-27 The DATA0 through DATA7 signals represent data bits 0 to7, respectively. Each signal is at high level I when data is logical 1 and low level when data is logical 0. These signals are used to transfer the 1284 extensibility request values to the printer. 10 PrtClk 28 O Printer clock signal. 11 PtrBusy, Data Bit-3,7 29 O Printer busy signal and reverse channel transfer data bit 3 or 7. 12 AckData Req, DataBit-2,6 28 O Acknowledge data request signal and reverse channel transfer data bit 2 or 6. 13 Xflag, DataBit-1,5 28 O X-flag signal and reverse channel transfer data bit 1 or 5. 14 HostBusy 30 I Host busy signal. 31 /INIT 30 I Not used. 32 /DataAvail, DataBit-0,4 29 O Data available signal and reverse channel transfer data bit 0 or 4. 36 1284-Active 30 I 1284 Active Signal 18 Logic-H ---- O Pulled up to +5V via 3.9K ohm resister. 35 +5V ---- O Pulled up to +5V via 3.3K ohm resister. 17 Chassis GND ---- --- Chassis GND. 16,33, 9-30 GND ---- --- Signal GND. 15,34 NC ---- --- Not connected. Note) In/Out refers to the direction of signal flow from the printer's point of view. Chapter 1 Product Description 28

Section	Page
Stylus Color 440/640/740	1
Product description	8
1.1 Features	9
1.2 Specifications	11
1.2.1 Printing Specification	11
1.2.2 Paper Specification	15
1.2.2.1 Cut Sheet	15
1.2.2.2 Transparency, Glossy Paper	15
1.2.2.3 Envelope	15
1.2.2.4 Index Card	16
1.2.3 Printing Area	17
1.2.3.1 Adjust Lever Setting	19
1.2.4 Ink Cartridge Specifications	20
1.2.5 Environmental Condition	22
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
1.3.1 Parallel Interface (Forward Channel)	25
1.3.2 Parallel Interface (Reverse Channel)	27
1.3.2.1 Prevention Hosts from Data Transfer time-out	30
1.3.2.2 Auto Interface Selection (for Stylus Color 640, 740)	30
1.3.3 Serial Interface (for Stylus Color 640, 740)	31
1.3.3.1 USB Interface (Only for Stylus Color 740)	31
1.4 Control Panel	32
1.4.1 Indicators (LEDs)	32
1.4.2 Panel Functions	33
1.4.3 Printer Condition and Panel Status	34
1.5 Error Status	35
1.5.1 Ink Out	35
1.5.2 Paper Out	35
1.5.3 Paper Jam	35
1.5.4 No Ink-Cartridge	36
1.5.5 Maintenance Request	36
1.5.6 Fatal Errors	36
1.8 Main Components	38
1.8.1 Printer Mechanism	38
1.8.2 C206 Main-B Board (Stylus Color 440)	39
1.8.3 C256 Main Board (Stylus Color 640)	39
1.8.4 C257 Main Board (Stylus Color 740)	40
1.8.5 Power Supply Board C206 PSB/PSE (Stylus Color 440, 640) C257 PSB/PSE (Stylus Color 740)	40
1.8.6 C206 PNL Board (Stylus Color 440, 640)	41
1.8.7 C209 PNL Board (Stylus Color 740)	41
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
2.1.1.3.1 Platen Gap Adjust Mechanism and Parallel adjustment Mechanism	49
2.1.1.4 Paper Feed Mechanism and Pump Mechanism	49
2.1.1.5 Ink System	52
2.1.1.6 Pump, Carriage Lock, Head Cleaner Mechanism	53
2.1.1.6.1 Cap Mechanism	55
2.2 Electrical Circuit Operating Principles	56
2.2.1 C206 PSB/PSE and C257 PSB/PSE Power Supply Board (for Stylus Color 440, 640, 740)	57
2.2.2 C206 Main-B, C255 Main (for Stylus Color 440)	60
2.2.3 C256 Main (for Stylus Color 640)	62
2.2.4 C257 Main, (for Stylus Color 740)	64
2.2.4.1 Reset Circuits	66
2.2.4.2 Sensor Circuits	68
2.2.4.3 EEPROM Control Circuits	70
2.2.4.4 Timer Circuit	71
2.2.4.5 DRAM Control	72
2.2.4.6 Print Head Control Circuit	72
2.2.4.7 PF (Pump) Motor Drive Circuit	76
2.2.4.8 CR Motor Drive Circuit	78
Troubleshooting	81
3.1 Troubleshooting	82
3.2 Unit Level Troubleshooting	85
3.2.1 Printer does not operate at power on.	85
3.2.2 Error is detected	86
3.2.3 Failure occurs during printing	86
3.2.4 Printer does not feed paper correctly.	87
3.2.5 Control panel operation is abnormal.	87
3.3 Unit Repair of Power Supply Board	88
3.4 Unit Repair of the Main Board	91
3.5 Repair of the Printer Mechanism	96
Disassembly and assembly	99
4.1 Overview	100
4.1.1 Precautions for Disassembling the Printer	100
4.1.2 Tools	101
4.1.3 Specification for Screws	102
4.1.4 Service Checks After Repair	103
4.2 Disassembly Procedures	104
4.2.1 Removing the Housing	105
4.2.2 Removing the Board Assembly	106
4.2.3 Removing the Operation Panel	108
4.2.4 Disassembling the Printer Mechanism	109
4.2.4.1 Removing the Print Head Unit	109
4.2.4.2 Removing the Absorber Tray Assembly ;A	112
4.2.4.3 Removing the Pump Assembly and Cap Assembly	113
4.2.4.4 Removing the CR Motor Assembly	116
4.2.4.5 Removing the PF Motor Assembly	117
4.2.4.6 Removing the ASF Assembly	119
4.2.4.6.1 Removing the Paper Feed Roller Assembly	120
4.2.4.6.2 Removing the Right and Left LD Roller Assembly	122
4.2.4.7 Removing the Carriage Assembly	123
4.2.4.8 Removing the PF Roller Assembly	125
4.2.4.9 Removing the PE Paper Detector Assembly	127
4.2.4.10 Removing the HP Detector	128
Adjustment	129
5.1 Overview	130
5.1.1 Required Adjustments	130
5.1.2 Adjustment Tools Required	131
5.2 Adjustment	132
5.2.1 Parallelism Adjustment	132
5.2.2 Adjustment by Adjustment Program	134
5.2.2.1 About Adjustment Program	134
5.2.2.2 Entering the Main menu	136
5.2.2.2.1 Registering the printer model name	138
5.2.2.2.2 Setting the CG (Destination information) (For Stylus Color 740 only)	139
5.2.2.3 Initial Ink Charge Operation	140
5.2.2.4 Head Cleaning Operation	141
5.2.2.5 Protection Counter Indicate/Reset	142
5.2.2.6 Market/Destination Check (only for Stylus Color 740)	144
5.2.2.7 Head Voltage ID Input	146
5.2.2.8 Head Angular Adjustment	148
5.2.2.9 Bi-D Adjustment	151
Maintenance	153
Maintenance	153
6.1 Overview	154
6.1.1 Cleaning	154
6.1.2 Service Maintenance	154
6.1.3 Lubrication	155
Appendix	160
A.1 Connector Summary	161
A.1.1 Connector Summary (Stylus Color 440/640)	162
A.1.1.1 Connector Pin Assignment (Stylus Color 440 and Stylus Color 640)	163
A.1.2 Connector Summary for Stylus Color 740	166
A.1.2.1 Connector Pin Assignment (Stylus Color 740)	167
A.2 EEPROM Address Map	169
A.2.1 EEPROM ADDRESS Map (Stylus Color 440/ 640)	169
A.2.2 EEPROM Address Map (Stylus Color 740)	174
A.3 Circuit Board Component Layouts	178
A.4 Exploded Diagrams	188
A. 5 Part List	198
A. 5.1 Part List for Stylus Color 440/ 640	198
A. 5.2 Part List for Stylus Color 740	200