Brother MFC-B7720DN Service Manual

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Confidential
4.14.4Message indicating that the report is full does not disappear
<User Check>
• Output each report.
4.14.5Paper tray cannot be recognized
<User Check>
• Close the paper tray properly.
Step Cause Remedy
1 Main PCB failure Replace the main PCB ASSY.
Step Cause Remedy
1
Connection failure of the T1
paper feed sensor harness
(non paper empty sensor
models only)
Reconnect the T1 paper feed sensor
harness.
2
Connection failure of the T1
paper empty/paper feed
sensor harness
(paper empty sensor models
only)
Reconnect the T1 paper empty/paper feed
sensor harness.
3
T1 paper feed sensor PCB
failure
(non paper empty sensor
models only)
Replace the T1 paper feed sensor PCB
ASSY.
4
T1 paper empty/paper feed
sensor PCB failure
(paper empty sensor models
only)
Replace the T1 paper empty/paper feed
sensor PCB ASSY.
5 Main PCB failure Replace the main PCB ASSY.

Brother MFC-B7720DN Specifications

General

Brand	Brother
Model	MFC-B7720DN
Category	All in One Printer
Language	English