Brother MFC-9130CW Service Manual page 99

■ Error code 7700
Jam 2-sided
Pull the paper tray completely out of the machine. Check inside the machine
towards the rear. 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.
Step
1 Foreign object inside the duplex
path
2 Fuser cover installation failure
3 Back cover installation failure
4 Main PCB failure
■ Error code 7900
Jam Manual Feed
Pull out the jammed paper from Manual Feed and press Start
After the manual feed sensor detects pass of paper fed from the manual feed slot, the
registration rear sensor does not detect paper pass after a set period of time. Or after the
manual feed sensor detects paper pass, the registration rear sensor detects paper pass within
a set period of time.
<User Check>
- Remove paper that is crammed in the manual feed slot.
- Check if the paper whose thickness is not prescribed is used.
- Remove the jammed paper.
- Check if paper is removed after manual feed printing is started.
Step
1 Foreign object inside the manual
feed path
2 Registration rear actuator that
has come off or that has been
caught
3 Registration clutch harness
connection failure
4 Registration front/rear/manual
feed sensor PCB harness
connection failure
5 Registration rear sensor failure
6 Registration clutch failure
7 Main PCB failure
Cause
Cause
2-60
Remedy
Remove foreign object.
Re-assemble the fuser cover.
Re-assemble the back cover.
Replace the main PCB ASSY.
Remedy
Remove foreign object.
Re-assemble the registration rear
actuator.
Check the registration clutch harness
connection and reconnect it.
Check the registration front/rear/manual
feed sensor PCB harness connection and
reconnect it.
Replace the paper feed unit.
Replace the registration clutch.
Replace the main PCB ASSY.
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