Epson ET 2750 Troubleshooting
EPSON ET-4750/ET-3750/ET-3700/ET-2750/ET-2700/L6190 series/L6170 series/L6160 series/L4160 series/L4150 series
- 2.1 Troubleshooting
- This section describes the troubleshooting workflow and fatal error information. 2.1.1 Troubleshooting Workflow
The following page describes the troubleshooting workflow. Follow the flow when troubleshooting problems.
This flowchart is compiled based on the following contents.
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Our experience regarding the quality problem.
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ESK's repair data.
Printer Mechanism specification for the product.
If the reason for the return is evident, first check the phenomenon user claims recurs, then proceed to the
troubleshooting.
If the SCN error is the reason for the return, since the printer may be the cause of the error, check the Fatal
Error Code history saved in the EEPROM with the adjustment program before starting the troubleshooting.
Troubleshooting
Troubleshooting
" Workflow when the Power is ON (Printer) (p39) "
" Workflow for Scanner Errors when the Power is ON (p42) "
" Workflow for Errors when Printing Starts (p43) "
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2.1.1.1 Workflow when the Power is ON (Printer)
Note
'*2': Performed if an abnormality occurred the last time the printer was powered off.
'*3': CR Unit reciprocates two times quickly when environmental temperature is lower than 5°C or when initial charge is not performed yet.
Note
'*4': Occurs five to six seconds after the completion of the mechanism operation.
Note
'*5':
ET-2750/L4160 series only
2.1.1.2 Workflow for Scanner Errors when the Power is ON
2.1.1.3 Workflow for Errors when Printing Starts
| EPSON | ET-4750/ET-3750/ET-3700/ET-2750/ET-2700/L6190 series/L6170 |
|---|---|
| 2.2 Power-On Sequence This section describes the power-on | sequences as reference for |
| troubleshooting. The preconditions are as follows. Condition: Power-on sequence (See Table2-1) | |
| No error occurred when you turned on the printer last correctly turned off. | time and it has been |
| Initial ink charge was done and every tank has sufficient No paper on the paper path. The Print Head is capped. The Carriage is normally fixed by the CR Lock. | ink. |
| Maintenance error recovery has never been performed. | |
| Table 2-1. Normal Power-on Sequence | CR Unit/PF Roller |
| Operation *1 1. Checking fuse on the Print Head | movement and position *2 0 80 HP |
Table Caption: This table outlines the normal power-on sequence for specific EPSON ET and L61xx printer series, detailing preconditions and the initial operational steps, including checking the print head fuse and CR Unit/PF Roller movement.
PF Roller
1-1.Checks if the fuse on the Print Head circuit boards is blown.*3
Checking for waste ink overflow
- Releasing the CR Lock
3-1.The PF Motor rotates counterclockwise and releases the CR Lock.
Seeking the home position
4-1.The CR Unit moves to the 0-digit side slowly and confirms it touches the Right Frame.
4-2.The CR Unit moves to the 80-digit side slowly and confirms it does not touch the foreign material, such as remaining paper.
4-3.The PF Motor rotates clockwise to completely release the CR Lock.
4-4.The CR Unit moves to the 0-digit side slowly and checks it touches the Right Frame.
Troubleshooting
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Power-On Sequence
- EPSON ET-4750/ET-3750/ET-3700/ET-2750/ET-2700/L6190 series/L6170 series/L6160 series/L4160 series/L4150 series
Revision C
- Operation 1 movement and position 2
CR Unit/PF Roller
4-5.The distance from the position where the CR Unit touched to the
Left Frame is regarded as the standard distance from the origin position, and the home position is fixed. From then on, the CR Unit
position is monitored according to the signals from the CR Encoder.
Low temperature operation sequence * 4
5-1.The CR Unit moves back and forth quickly to near the left frame two times.
Ink system performance while power on
6-1.The CR Unit goes back to the home position.
Note *1 :
*2 :
*3 :
*4 :
The rotation directions of the PF Motor are as follows.
Clockwise:
Paper is fed normally
Counterclockwise:
Paper is fed backward
The conditions of the CR Lock are as follows.
Red:
CR Lock is set
White:
CR Lock is released
The fatal error occurs if there is a problem such as the fuse blew.
Executed when the detected temperature is under 5 o C (41 o F) by the thermistor on the
Print Head.
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EPSON ET-4750/ET-3750/ET-3700/ET-2750/ET-2700/L6190 series/L6170 series/L6160 series/L4160 series/L4150 series
2.3 Fatal Error Code List
This section describes how to check the fatal error code, description, and the possible causes.
The fatal error code is stored in the EEPROM on the Main Board and can be read out using the Adjustment Program. When a fatal error occurs, this product
displays the fatal error code automatically on the panel LCD.
LCD display screen
2.3.2 Fatal Error Code
This section describes the fatal error code and the possible cause for this
product.
" Scanner (p46) "
" Printer (CR) (p52) "
" Printer (PF) (p55) "
" Printer (PW/PE Sensor) (p57) "
" Printer (Power Supply) (p57) "
" Printer (Head/CSIC) (p58) "
" Printer (Others) (p59) "
" System Error (p59) "
ADF related errors are included in the scanner fatal error list.
000021
Error code
Figure 2-1. Indication of the fatal error code
Troubleshooting
Fatal Error Code List
Revision C
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Table Caption: This table details the ADF PID excess speed error for various Epson printer series, outlining possible causes and confirmation procedures for troubleshooting. It also specifies the relevant connector on the Main Board.
- Paper feed was stopped by;
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Obstacles such as jammed paper
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Overload of the paper feed mechanism
Disengaging or tooth breakage of wheel train of the paper feed mechanism
Failed to read the SCN motor encoder
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Jumping of the SCN drive gear wheel train
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Contamination of the SCN encoder scale
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Damage or skew of the SCN encoder FFC
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Failure of the SCN encoder sensor
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Failure of the Main Board
The ADF paper feed did not run or obstacles exist in
