Brother HL-L9300CDW Service Manual page 86

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Error code 7500
Jam Tray 3
-
In the case of printing by feeding paper from the T3 paper tray unit, after the T3 paper feed
sensor detects paper pass, the registration front sensor does not detect paper pass after a set
period of time.
< User Check >
- Remove the jammed paper.
- Close the Paper tray 1 and LT paper tray unit correctly.
Step
1 Foreign object at the front of the
Paper tray 1 or LT paper tray unit
2 T1/LT paper dust cleaning roller
installation failure
3 Registration front actuator that
has come off or that has been
caught
4 Connection failure of the
registration front/rear sensor
PCB harness
5 Registration front sensor failure
6 Paper feed related gear
damaged
7 Main PCB failure
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Error code 7700
Jam 2-sided
Pull out Tray 1 completely. Check inside the machine or open the Back Cover
to remove the jammed paper.
After the first side is printed in 2-sided printing mode, the registration front sensor does not
detect paper pass after a set period of time.
< User Check >
- Remove the jammed paper.
- Check if the back cover is closed correctly.
- Check if the paper tray 1 is closed correctly.
Step
1 Foreign object inside the duplex
path
2 Foreign object inside the duplex
path of the paper tray 1
3 Fuser cover installation failure
4 Back cover installation failure
5 Main PCB failure
Cause
Cause
2-66
Remedy
Remove the foreign object.
Re-assemble the T1/LT paper dust
cleaning roller.
Re-assemble the registration front
actuator.
Reconnect the registration front/rear
sensor PCB harness.
Replace the registration front/rear sensor
PCB ASSY.
Replace the main drive unit.
Replace the main PCB ASSY.
Remedy
Remove the foreign object.
Remove the foreign object.
Re-assemble the fuser cover.
Re-assemble the back cover.
Replace the main PCB ASSY.
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