Brother HLL3290CDW Service Manual page 122

■
Error code 8501
The T1 paper feed sensor detected that the T1 is open when printing from the T1 (before the
registration of printing in the engine).
<User Check>
• Close the T1 correctly.
Step
T1 paper feed actuator coming
1 off or caught in some sections of
the machine
2 T1 paper feed sensor failure
3 Main PCB failure
■
Error code 8505
The T1 paper feed sensor detected that the T1 is open when printing from the T1 (after the
registration of printing in the engine).
<User Check>
• Close the T1 correctly.
Step
1 Main PCB failure
■
Error code 8903
The back cover sensor detected the open state when 2-sided printing is started (before the
registration of printing in the engine).
Error code 8904
The back cover sensor detected the open state during 2-sided printing (after the registration of
printing in the engine).
<User Check>
• Close the back cover correctly.
Step
Connection failure of the back
1
cover sensor harness
Back cover sensor attachment
2
failure
Breakage of boss that presses
3
the back cover sensor
4 Main PCB failure
Cause
Cause
Cause
2-86
Remedy
Reattach the T1 paper feed actuator.
Replace the paper feed unit.
Replace the main PCB.
Remedy
Replace the main PCB.
Remedy
Reconnect the back cover sensor
harness.
Reattach the back cover sensor.
Replace the back cover.
Replace the main PCB.
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