Brother HL-4200CN Service Manual page 221

003-340 Firmware Error FIP
Step
Does the error still happen even after
1
powering Off and On was done?
Check whether the value of NVM is
2 correct.
Is the value of NVM correct?
003-356 NV-RAM Error FIP
Step
Does the error still happen even after
1
powering Off and On was done?
Remove following components once, and
reinstall them correctly.
Print head cartridge ASSY
FUSER ASSY
2
PWBA EEPROM
MCU HL-4200
Does the error still happen even after
powering Off and On was done?
Replace print head cartridge ASSY.
3 Does the error still happen even after
powering Off and On was done?
Replace FUSER ASSY.
4 Does the error still happen even after
powering Off and On was done?
Replace PWBA EEPROM.
5 Does the error still happen even after
powering Off and On was done?
006-370 Scanner Failure FIP
Step
Checking harness ASSY scanner KA for
1
continuity
Is J15<=>P151 continuous normally?
009-340 CTD Sensor Error FIP
Step
Initial setting
1 Check the following for evidence of fault.
ADC sensor ASSY replacing condition
Checking harness ASSY CTD for
2 continuity
Is J136<=>J1361 continuous normally?
Checking harness ASSY front 1A for
continuity
3
Is J13<=>P1361 continuous normally?
Checking ADC sensor ASSY
Check if an error occurs though the ADC
4
sensor ASSY was replaced with a new
one.
Check
Check
Check
Check
V-15
Remedy
Yes
Go to step [2] End of work
Replace MCU Correct the
HL-4200 value of NVM.
Remedy
Yes
Go to step [2]
Go to step [3]
Go to step [4]
Go to step [5]
Replace MCU
HL-4200
Remedy
Yes
Replace
Replace scanner
harness ASSY
ASSY
scanner KA
Remedy
Yes
Replace the parts
Go to step [2]
concerned
Replace
Go to step [3] harness ASSY
CTD
Replace
Go to step [4]
harness ASSY
front 1A
Replace MCU
HL-4200
No
No
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End of work
No
No
End of work