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Epson 680Pro Service Manual - Page 58

Table 3-18. Dot missing occur and it is not recovered with CL, Table 3-19. Dot missing occur and

UPC - 010343832138

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EPSON Stylus COLOR 680/777/777i Table 3-18. Dot missing occur and it is not recovered with CL Step No. Detail phenomenon Check point Remedy 1. Check if ink is ejected to the waste ink pad via pump unit in the CL sequence. 2. Check if there is any foreign material around the seal rubber parts on the cap assembly. 1. If ink is not ejected at all to the waste ink pad in the CL sequence, proceed the following check point 2). 2. Remove the foreign material around the seal rubber parts. In the CL sequence, the pump unit seems work correctly. But, ink is not ejected to the 1 waste ink pad at all. Cap seal rubber parts Moreover, any ink is not absorbed from the head to the cap. 3. Check if any damage is observed around the seal rubber parts on 3. Replace the Cap assembly with new one. the cap assembly. 4. Check if the two compression spring are assembled in the Cap assembly correctly. 4. Set the Compression spring into the Cap assembly. Compression spring Revision B Table 3-19. Dot missing occur and it is not recovered with CL Step No. Detail phenomenon Check point Remedy 5. Check if the Pump tube is connected to the bottom of the Cap assembly correctly 7. Connect the Pump tube to the bottom of the Cap assembly deeply. Pump tube connection point In the CL sequence, the pump unit seems work correctly. But, 6. Check if the pump 8. Pump unit may coil the tube has a little slack pump tube inside the any ink is not ejected between the Cap unit. 1 to waste ink pad. assembly and the pump unit when the In this case, pull out the coiled tube from the Moreover, any ink is Cap assembly is slide pump unit carefully. not absorbed from the up completely. After that, connect the head to the cap. Tube pump tube to the Cap assembly after placing the tube correctly. Cap assy. Pump unit 9. If the problem is not solved, replace the Pump unit with new one. Troubleshooting Troubleshooting with LED Error Indications 58

Section	Page
PRODUCT DESCRIPTION	9
1.1 FEATURES	10
1.2 SPECIFICATIONS	11
1.2.1 Physical Specification	11
1.2.2 Printing Specification	11
1.2.3 Paper Feeding	12
1.2.4 Input Data Buffer	12
1.2.5 Electric Specification	12
1.2.6 Environmental Condition	13
1.2.7 Reliability	13
1.2.8 Safety Approvals	13
1.2.9 Acoustic Noise	13
1.2.10 CE Marking	13
1.3 INTERFACE	14
1.3.1 Parallel Interface (Forward Channel)	14
1.3.2 Parallel Interface (Reserve Channel)	17
1.3.3 USB Interface	18
1.3.4 Prevention of Data Transfer Time-out	19
1.3.5 Interface Selection	19
1.3.6 IEEE1284.4 Protocol	19
1.4 OPERATOR CONTROLS	20
1.4.1 Operating Switch	20
1.4.2 Control Panel	20
1.4.2.1 Switches	20
1.4.2.2 Indicators	20
1.4.3 Panel Functions	21
1.4.4 Printer Condition and Panel Status	22
1.4.5 Printer Initialization	22
1.4.6 Errors	23
1.5 PAPER	24
1.5.1 Paper Handling	24
1.5.2 Paper Specification	24
1.5.2.1 Cut Sheet	24
1.5.2.2 Transparency, Glossy Paper	24
1.5.2.3 Envelope	24
1.5.2.4 Index Card	25
1.5.3 Printing Area	26
1.5.3.1 Cut Sheet	26
1.5.3.2 Envelopes	27
1.6 INK CARTRIDGE	28
1.6.1 Black Ink Cartridge	28
1.6.2 Color Ink Cartridge	28
Operating Principles	29
2.1 Overview	30
2.1.1 Printer Mechanism	30
2.1.2 Printhead	31
2.1.2.1 Printing Process	32
2.1.2.2 Printing Method	32
2.1.3 Carriage Mechanism	33
2.1.4 Paper Feeding Mechanism	34
2.1.5 Paper Loading Mechanism (ASF Unit)	35
2.1.6 Ink System Mechanism	38
2.1.6.1 Pump Unit & Wiper mechanism	38
2.1.6.2 Capping Mechanism	39
2.2 Electrical Circuit Operating Principles	40
2.2.1 C383 PSB/PSE board	40
2.2.2 C383 MAIN Board	43
2.2.2.1 Main elements	44
2.2.2.2 Printhead Driver Circuit	45
2.2.2.3 PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit	46
2.2.2.4 CR Motor Driver Circuit	46
2.2.2.5 Reset Circuit	47
2.2.2.6 EEPROM Control Circuit	47
2.2.2.7 Sensor Circuit	48
Troubleshooting	49
3.1 Overview	50
3.2 Troubleshooting with LED Error Indications	51
Disassembly and Assembly	61
4.1 Overview	62
4.1.1 Precautions	62
4.1.2 Tools	63
4.1.3 Work Completion Check	64
4.2 Disassembly	65
4.2.1 Housing removal	66
4.2.2 Operation Panel removal	67
4.2.3 Printhead removal	68
4.2.4 CR motor removal	71
4.2.5 Waste drain ink pad unit removal	73
4.2.6 Circuit board removal	75
4.2.7 LD Roller removal	79
4.2.8 HP/PE Sensor removal	83
4.2.9 Ink system unit removal (Cap & Pump unit )	85
4.2.10 Paper Eject Roller removal	87
4.2.11 PF motor removal	89
4.2.12 CR unit removal	91
4.2.13 Paper feed roller removal	94
4.2.14 Disassembling ASF frame unit	97
Adjustment	100
5.1 Overview	101
5.1.1 Required Adjustment	101
5.1.2 Adjustment Program feature	102
5.1.3 Adjustment Program Installation Procedure	103
5.1.4 Adjustment Program Initial Setting menu	103
5.1.5 Head ID Input	103
5.1.6 Bi-D Adjustment	105
5.1.7 USB ID input	107
5.1.8 Head Cleaning Operation	109
5.1.9 Initial Ink Charge Operation	110
5.1.10 Refurbishment for DOA	111
5.1.11 Protection Counter Check/Reset	112
5.1.12 Check pattern printing	114
5.1.13 EEPROM check function	115
5.1.14 CSIC Information	116
Maintenance	117
6.1 Overview	118
6.1.1 Cleaning	118
6.1.2 Service Maintenance	119
6.1.3 Lubrication	119
Appendix	123
7.1 Connector Summary	124
7.1.1 Major Component Unit	124
7.1.2 EEPROM Address Map	127
7.2 Component Layout	131
7.3 Exploded Diagram	133
7.4 Parts List	138

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EPSON Stylus COLOR 680/777/777i

Revision B

Troubleshooting

Troubleshooting with LED Error Indications

Table 3-18. Dot missing occur and it is not recovered with CL

Step

No.

Detail phenomenon

Check point

Remedy

In the CL sequence,

the pump unit seems

work correctly. But,

ink is not ejected to the

waste ink pad at all.

Moreover, any ink is

not absorbed from the

head to the cap.

1. Check if ink is ejected

to the waste ink pad

via pump unit in the

CL sequence.

2. Check if there is any

foreign material

around the seal rubber

parts on the cap

assembly.

3. Check if any damage

is observed around the

seal rubber parts on

the cap assembly.

4. Check if the two

compression spring

are assembled in the

Cap assembly

correctly.

1. If ink is not ejected at all

to the waste ink pad in

the CL sequence,

proceed the following

check point 2).

2. Remove the foreign

material around the seal

rubber parts.

3. Replace the Cap

assembly with new one.

4. Set the Compression

spring into the Cap

assembly.

Cap seal rubber

parts

Compression

spring

Table 3-19. Dot missing occur and it is not recovered with CL

Step

No.

Detail phenomenon

Check point

Remedy

In the CL sequence,

the pump unit seems

work correctly. But,

any ink is not ejected

to waste ink pad.

Moreover, any ink is

not absorbed from the

head to the cap.

5. Check if the Pump

tube is connected to

the bottom of the Cap

assembly correctly

6. Check if the pump

tube has a little slack

between the Cap

assembly and the

pump unit when the

Cap assembly is slide

up completely.

7. Connect the Pump tube

to the bottom of the Cap

assembly deeply.

8. Pump unit may coil the

pump tube inside the

unit.

In this case, pull out the

coiled tube from the

pump unit carefully.

After that, connect the

pump tube to the Cap

assembly after placing

the tube correctly.

9. If the problem is not

solved, replace the Pump

unit with new one.

Pump tube

connection point

Pump unit

Tube

Cap assy.