Brother MFC-7420 Fuser Removal Procedure
Below you will find the illustrated Brother MFC-7420 Fuser Removal Procedure. The main problem I see with these fusers is the pick fingers wears into the hot roller surface that causes a scratch in the roller and a gray line running down the paper. The good news is that the hot roller is easy to see when you lower or remove the back cover. If you look at the picture of the fuser below, the hot roller is the tan roller.
There are two types of fusers for this model. You can either go by the serial number or the thermistor cable. One has a white thermistor cable and the other has a gray cable. If you look at step 5., I have circled the cable in question.
DCP7020, MFC7420, MFC7820N, FAX2820, FAX2920, MFC7220, MFC7225N
SERIAL NUMBER IS BEFORE E5J929990 (old I style) – LM6721001
Brother MFC-7420 Fuser Unit – 110 / 120 Volt (Genuine) – $113.95
from: Precision Roller
DCP7020, MFC7420, MFC7820N, FAX2820, FAX2920, MFC7220, MFC7225N
SERIAL NUMBER IS AFTER E5J929990 – LM6722001
Brother MFC-7420 Fuser Unit – 110 / 120 Volt (Genuine) – $119.95
from: Precision Roller
1. Brother MFC-7420 Rear Cover
(1) Remove the rear cover.
NOTE: Remove the “A” section of the rear cover while opening the rear cover slightly.
2. Brother MFC-7420 Rear Chute Cover
(1) Remove the rear chute cover.
(2) Remove the paper eject actuator and the eject actuator spring.
3-4. Brother MFC-7420 Exit Assembly
(2) Remove the two bind B M4x12 taptite screws and the rear chute cover spring.
(3) Remove the inner chute.
NOTE: Re-assemble the inner chute while pushing onto the pinch roller of the inner chute
with the eject roller of the joint cover ASSY.
5. Brother MFC-7420 Fuser Removal
(1) Disconnect the heater harness connector and thermistor harness connector.
(2) Remove the two cup B M4x12 taptite screws, and then remove fixing unit.
The tricky part of this repair, for myself, is putting the exit assembly back in. This will take a little bit of patience. Also, if you have the exit assembly out, it might not hurt to clean the exit rollers inside of the machine. They are known troublemakers when they get dirty. Below you will find links to order in a replacement fuser or if you decide it’s time to move on then I’ve added a few replacement models below.
DCP7020, MFC7420, MFC7820N, FAX2820, FAX2920, MFC7220, MFC7225N
SERIAL NUMBER IS BEFORE E5J929990 (old I style) – LM6721001
Brother MFC-7420 Fuser Unit – 110 / 120 Volt (Genuine) – $113.95 Genuine LM6721001K Fuser Unit – 110 / 120 Volt for Brother MFC-7420; Fuser Assembly / Unit – Genuine Brother Fuser Assembly – Version I w/ White Connection Harness; Brother LM6721001K / LM4959001K / LM4959001 / LM4863001 / LM4573001 |
DCP7020, MFC7420, MFC7820N, FAX2820, FAX2920, MFC7220, MFC7225N
SERIAL NUMBER IS AFTER E5J929990 – LM6722001
Brother MFC-7420 Fuser Unit – 110 / 120 Volt (Genuine) – $119.95 Genuine LM6722001K Fuser Unit – 110 / 120 Volt for Brother MFC-7420; Fuser Assembly / Unit – Genuine Brother Fuser Assembly – Version S Type Fuser w/ Gray Thermistor Connection Harness; Brother LM6722001K / LM6313001 |
