Brother HL-L8250CDN Service Manual page 200

9.18 Main PCB ASSY
Note: Backup of machine information
Before starting disassembly work, back up the machine information and user setting
information. (Refer to
Chapter 5.) After replacing the PCB, restore the backup data to a new PCB.
(1) Disconnect the twenty two Connectors (CN2, CN3, CN4, CN7, CN8, CN9, CN10, CN11,
CN12, CN13, CN14, CN21, CN28, CN30, CN31, CN32, CN33, CN36, CN37, CN38,
CN39 and CN41) and three Flat cables (CN1, CN17 and CN27) from the Main PCB
ASSY.
Note:
- 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
that the cables are not at an angle.
Main PCB ASSY
"1.3.11 Backup of machine information (Function code 41)" in
CN30
CN33 CN31 CN28
CN36
CN37
CN38
CN39
CN40
CN32
CN27
Fig. 3-72
3-63
CN23 CN18
CN41
CN1
CN14
CN2
CN3
CN4
CN5
CN6
CN7
CN8
CN9
CN10
CN11
CN12
CN13
CN21 CN17
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