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| Brother DCP4020C Trouble Error Codes | 
| 25 | Ink cartridges had already been loaded when the power was first applied. | Reload ink cartridges, referring to the Owner's Manual. | 
| 26 | The black ink has run out. | � Ink cartridges � Ink cartridge sensor PCB � Needle tube & head flat cable ASSY �Main PCB | 
| 27 | The yellow ink has run out. | � Ink cartridges � Ink cartridge sensor PCB � Needle tube & head flat cable ASSY �Main PCB | 
| 28 | The cyan ink has run out. | � Ink cartridges � Ink cartridge sensor PCB � Needle tube & head flat cable ASSY �Main PCB | 
| 29 | The magenta ink has run out. | � Ink cartridges � Ink cartridge sensor PCB � Needle tube & head flat cable ASSY �Main PCB | 
| 3X | Carriage travel error | � Any obstacle to the travel of the carriage in the machine? � Recording paper jammed? � Carriage ASSY � CR encoder strip (Any stains or scratches? Hooked correctly?) � Carriage motor �Main PCB � Power supply PCB � Purge unit � Engine lower frame | 
| 41 | The head drive voltage has not been turned from Low to High within the specified time. | � Carriage ASSY �Main PCB � Print head unit � Power supply PCB | 
| 42 | The head drive voltage has not been turned from High to Low within the specified time. | � Carriage ASSY �Main PCB � Print head unit � Power supply PCB | 
| 43 | Head thermistor broken. | � Print head unit � Carriage ASSY �Main PCB | 
| 44 | Head thermistor short-circuited | .� Print head unit � Carriage ASSY �Main PCB | 
| 45 | Flushing operation abnormally ended. (The head temperature has arisen abnormally.) | � Print head unit | 
| 46 | The number of performed purge sequences has reached the limit. | � Ink absorber box � Driver PCB | 
| 47 | Head parameters stored in the EEPROM are invalid. (This code may appear only in the maintenance mode.) | � Print head unit � Driver PCB � Power supply PCB | 
| 48 | Weak connection of the head flat cables. | � Main PCB � Print head unit | 
| 4D | Error in the head drive voltage parameter stored in the EEPROM but not accessible at the user site. (This code may appear only in the maintenance mode.) | �Main PCB � Driver PCB | 
| 4E | Out of the allowable range of the head drive voltage designed for individual print head properties. (This code may appear only in the maintenance mode.) | �Main PCB � Driver PCB � Print head unit | 
| 50 | The purge cam HP switch does not come ON even after the purge cam has been driven by the specified number of pulses. | � Purge unit � Engine lower frame � Paper feed motor �Main PCB | 
| 51 | The purge cam HP switch does not go OFF even after the purge cam has been driven by the specified number of pulses. |  | 
| 52 | The purge cam HP switch does not detect the origin point. | � Purge unit � Engine lower frame � Paper feed motor �Main PCB | 
| 54 | The air pump motor does not rotate. |  | 
| 55 | The air pump motor rotates abnormally. (This code may appear only in the maintenance mode.) | � Air pump & motor module � Driver PCB | 
| 60, 61, 62, 63 | Paper width sensor (media sensor) error. | � Replace the needle tube & head flat cable ASSY | 
| 68 | The ASF switch remains OFF after the ASF motor is driven by the specified steps. |  | 
| 69 | The ASF switch remains ON after the ASF motor is driven by the specified steps. |  | 
| 7D | Any of the ink dot counters has counted up to the specified number of dots, meaning the end of the head service life. | � Print head unit � Ink absorber box | 
| 7E | No head parameters stored in the EEPROM. (This code may appear only in the maintenance mode.) | � Main PCB � Driver PCB � Print head unit | 
| 7F | Print engine error. |  | 
| 80 | At the start of recording operation, the controller detects that paper is smaller than A4 size in length or width. | � Main PCB � Driver PCB � Paper width sensor �Paper size | 
| 81 | Recording paper jam. (The paper width sensor stays ON.) | � Paper width sensor | 
| 83 | Recording paper jam. (At the retry of paper pulling-in operation, the registration sensor is not OFF.) | � Registration sensor actuator �Main PCB | 
| 84 | Recording paper jam. (The paper width sensor and/or registration sensor has detected a paper jam.) | � Registration sensor actuator � If the paper width sensor is defective, replace the needle tube & head flat cable ASSY. �Main PCB | 
| 87 | The paper feed motor has not stopped at the correct position. | � Paper feed motor | 
| 88 | Recording paper jam. (Even after paper pulling-in operation, the registration sensor is still OFF.) | � Registration sensor actuator � If the paper width sensor is defective, replace the needle tube & head flat cable ASSY. �Main PCB | 
| 8A | The paper feed motor does not rotate. |  | 
| 8B | The paper feed motor stops suddenly |  | 
| 8D | The paper feed motor rotates in the reverse direction. |  | 
| 8E | Max. speed error in the paper feed motor. |  | 
| A1 | Scanner unit or ink slot cover opened. | � Scanner open sensor actuator � Ink slot cover open sensor actuator � Control panel PCB | 
| A4 | 50% or more faulty of white level data. | �CIS unit � Driver PCB �Main PCB | 
| AC | Less than 50% faulty of white level data. | � CIS unit � Driver PCB �Main PCB | 
| AF | CIS positioning error | � CIS unit � CIS flat cable � Driver PCB �Main PCB | 
| B1 | Dark level offset data level error for scanning. | � CIS unit �Main PCB | 
| B2 | Gain control data level error for scanning. | � CIS unit �Main PCB | 
| B3 | Scan area left edge detection error. | � CIS unit �Main PCB � Black markings on the white-level reference film inside the scanner top cover | 
| B4 | Scan area right edge detection error. | � CIS unit �Main PCB � Black markings on the white-level reference film inside the scanner top cover | 
| B5 | Horizontal scanning edge reduction detection error in scanning area setting |  | 
| B6 | Horizontal scanning edge enlargement detection error in scanning area setting |  | 
| B7 | A/D converter reference voltage error (at High level). | � Main PCB | 
| B8 | A/D converter reference voltage error (at Low level). | � Main PCB | 
| B9 | Light emission intensity error of the LED array (Exceeding the upper limit). | � CCD unit �Main PCB | 
| BB | White level data error. | � CIS unit � CIS flat cable � Driver PCB | 
| BD | Black level data error. | � CIS unit � Main PCB | 
| BE | Scan starting edge detection error. | � CIS unit � CIS flat cable � Driver PCB � Black markings on the white-level reference film inside the scanner top cover | 
| DX | Modem error. | � Main PCB | 
| E4 | Out of recording paper. | � ASF � Registration sensor actuator � Main PCB | 
| E6 | Write error in EEPROM. | � Driver PCB | 
| E8 | Data scanning error during transmission. | � CIS unit � Main PCB | 
| EA | Document removed at phase B. | � CIS unit � Main PCB | 
| F3, F5 | Internal software error. | � Replace the main PCB if this error occurs frequently. | 
| F6 | PC interface error. | � Interface cable �Main PCB | 
| | F7 | Media module connection error. | � Main PCB � Media module |  | F8 | Backup battery not loaded correctly. | � Reinsert the battery connector. � Replace the battery. |  | F9 | Weak connection of media flat cables. | � Media flat cables �Media PCB |  | FF | Memory management error. | � Replace the main PCB if this error occurs frequently. | 
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Brother DCP4020C Trouble Error Codes
 
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