Brother HL-5440D Service Manual page 67

Error code 3B00
Print Unable 3B
An error occurred during access to the DRAM in the main PCB.
Step
1 Main PCB failure
Error codes 3C00 to 4300
These errors do not usually occur during normal use. The possible causes are noise around
the installation site, fluctuation of the power supply voltage, and failures in the software.
---
An unidentified error occurred.
Step
1 Main PCB failure
Error code 4400
No Toner
The toner sensor detected that the toner cartridge was not set.
<User Check>
• Set the toner cartridge.
Step
Toner sensor PCB failure
1
2 Relay front PCB failure
3 Main PCB failure
Error codes 4500 to 4F00
These errors do not usually occur during normal use. The possible causes are noise around
the installation site, fluctuation of the power supply voltage, and failures in the software.
---
An unidentified error occurred.
Step
1 Main PCB failure
Cause
Replace the main PCB ASSY.
Cause
Replace the main PCB ASSY.
Cause
Refer to
(function code: 32)" in Chapter 5
sensor operation. If the sensor operation is
faulty, replace the toner sensor PCB ASSY.
Replace the relay front PCB ASSY.
Replace the main PCB ASSY.
Cause
Replace the main PCB ASSY.
2-31
Remedy
Remedy
Remedy
"1.3.8 Check sensor operation
Remedy
to check the
Confidential