Main Pcb - Brother DCP-J552DW Service Manual

9.12 Main PCB

Note Before replacing the main PCB, backup the machine and user settings information (refer to
•
Chapter 5 "1.3.13 Backup of Machine Information (Maintenance mode
calibration data (refer to
Restoration of Head Calibration Data (Maintenance mode
PCB, restore the backed up information to the new PCB. If a backup cannot be done, you
will need to replace the ink absorber box and flushing box and reset the purge and flushing
counters.
Before starting work involving the main PCB, make sure that the power cord and
•
telephone line is unplugged from their outlets.
• Before removing the main PCB, disconnect the harnesses and flat cables first, then remove
the screws. Also, before reinstalling the main PCB, tighten the screws first, then connect
the harnesses and flat cables. Follow this sequence while making sure that harnesses and
flat cables are not damaged by the screws and the screwdriver.
(1) Disconnect the following harnesses and flat cables from the main PCB.
Note • Make sure that the main PCB is screwed in place while connecting and disconnecting
harnesses and flat cables.
• After disconnecting flat cables, check that each cable is not damaged at its end or short-
circuited. When connecting flat cables, do not insert them at an angle. After insertion,
check again that the cables are not at an angle.
Document scanning position
sensor harness (3-wire)
Carriage motor
harness (2-wire)
Document detection
sensor harness
(3-wire)
ADF motor harness
(2-wire)
Document scanner
motor harness
(4-wire)
ASF motor harness (2-wire)
Paper feed motor harness
(2-wire)
Wireless LAN PCB
harness (4-wire)
Power supply harness
(6-wire)
(USB interface)
Chapter 5 "1.3.25 Updating of Head Property Data and Backup/
Scanner cover
open sensor
harness (2-wire)
Speaker harness (2-wire)
LCD flat cable (50-wire)
Pressure roller release sensor
harness (3-wire)
PF/registration sensor
harness ASSY (7-wire)
CIS flat cable (12-wire)
Main PCB
ASF encoder
sensor harness
Purge cam switch
(4-wire)
harness (2-wire)
3-63
46)") and the head
68)"). After replacing the main
(USB interface)
(LAN interface)
Carriage flat cable 1
(20-wire)
Carriage flat cable 3
(7-wire)
Carriage flat cable 2
(8-wire)
Ink sensor flat cable
(16-wire)
Modem PCB harness
(11-wire)
Ink cartridge
cover sensor harness
(2-wire)
Disc guide sensor
harness (2-wire)
Confidential
(3_084)