Brother MFC5890CN - Main PCB

6-36
Confidential
6.1.9 Main PCB
Caution: Before replacement of the main PCB, back up the machine information and user
setting information, referring to Chapter 9, Section 9.4.11 "Backup of Machine
Information (Function code 46) (User-accessible)." After replacement, restore the backed
up information to the new PCB. Failure to do so requires replacing also the ink absorber
box and flushing box after replacement of the main PCB.
Caution: Before accessing the main PCB, make sure that the power cord
is unplugged from the
electrical outlet and the telephone line
is disconnected; otherwise, an electric shock could occur.
Caution: At the time of removal of the main PCB, untightening screws should be preceded by
disconnection of the harnesses and flat cables, and at the time of installation, connection of the
harnesses and flat cables, by tightening of screws. Observing this sequence prevents harnesses
and flat cables from getting crushed or damaged by screws or screwdrivers.
(1) Disconnect the following harnesses and flat cables from the main PCB
Caution: Do not remove the screws from the main PCB before disconnecting harnesses
and flat cables.
Note:
After disconnecting the flat cables, check that each cable is not damaged at its end or
short-circuited. When connecting the flat cables, do not insert them at an angle. After
insertion, check again that they are not at an angle.
- Ink cartridge detection sensor harness (7-wire)
- Ink empty sensor harness (9-wire)
- ASF* encoder harness (4-wire) (*Auto Sheet Feeder)
- Purge cam switch harness (2-wire)
- Cap lift cam switch harness (2-wire)
- Power supply harness (5-wire)
- PF encoder/registration sensor harness (7-wire)
- Paper feed motor harness (2-wire)
- ASF* motor harness (2-wire)
- Carriage motor harness (2-wire)
- Head flat cable 1 (13-wire)
- Head flat cable 2 (12-wire)
- Head flat cable 3 (11-wire)
- WLAN PCB harness (6-wire)*
1
*1 For wireless LAN-enabled model.
Main PCB
Power supply
harness
(5-wire)
Carriage motor harness
(2-wire)
Paper feed motor
harness
(2-wire)
PF encoder/
registration
sensor harness
(7-wire)
(Panel-main harness)
(5-wire)
(Color LCD flat cable)
(28-wire)
For debugging at the factory.
Do not disturb it.
(Document sensor PCB harness)
(5-wire)
Ink empty
sensor
harness
(9-wire)
Main-MJ (EXT) harness
(2-wire, black)
Main-MJ (LINE) harness
(2-wire, yellow)
ASF motor harness
(2-wire)
Ink cartridge
detection sensor
harness
(7-wire)
Purge cam switch
harness
(2-wire)
ASF encoder harness
(4-wire)
Cap lift cam
switch harness
(2-wire)
(LAN interface)
(CIS flat cable) (12-wire)
Head flat cable 1 (13-wire)
Head flat cable 2 (12-wire)
Head flat cable 3 (11-wire)
(CIS motor harness)
(4-wire)
(Speaker harness)
(2-wire)
(Battery harness)
(5-wire)
(ADF motor harness)
(4-wire)
(USB interface)
For debugging at
the factory.
Do not disturb it.
(Main_PCB_BHL9_A3_1)
WLAN PCB harness*1
(6-wire)