Brother DCP-J552DW Service Manual page 54

■ Error Code 20
Cannot Detect
Cannot identify a black ink cartridge
Detected by the ink cartridge detection sensor and the ink remaining sensor.
Error Code 21
Cannot Detect
Cannot identify a yellow ink cartridge
Detected by the ink cartridge detection sensor and the ink remaining sensor.
Error Code 22
Cannot Detect
Cannot identify a cyan ink cartridge
Detected by the ink cartridge detection sensor and the ink remaining sensor.
Error Code 23
Cannot Detect
Cannot identify a magenta ink cartridge
Detected by the ink cartridge detection sensor and the ink remaining sensor.
<User Check>
- Check if an incompatible ink cartridge is loaded.
- Reload the ink cartridge.
- Replace the ink cartridge.
- During initialization, check if other cartridges not supplied were not set before the instruction to
do so.
Step
1 Each ink cartridge sensor is
defective
2 Main PCB defective
Cause
Replace the ink refill ASSY.
Replace the main PCB ASSY.
2-21
LCD
LCD
LCD
LCD
Solution
Confidential