Chapter 4 Disassembly And Re-Assembly; Safety Precautions - Brother MFC8440D Service Manual

7/13/2019
CHAPTER 4
1.

SAFETY PRECAUTIONS

To avoid creating secondary problems by mishandling, follow the warnings and precautions below
during maintenance work.
( 1) A l w a y s t u r n o f f t h e p o w e r s w i t c h a n d u n p l u g t h e p o w e r c o r d f r o m t h e p o w e r o u t l et
before accessing any p arts inside the printer.
(2) Some parts insid e the printer are extremely hot imm ediately after the print er is
u s e d .
p r i n t e r , n e v e r t o u c h t h e r e d c o l o r e d p a r t s s h o w n i n t h e f o l l o w i n g f i g u r e s .
!
CAUTION:
(1) Be careful not to lose screws, washers, or other parts removed.
(2) Be sure to apply grease to the gears and applicable positions specified in this chapter.
(3) When using soldering irons or other heat-generating tools, take care not to accidentally
damage parts such as wires, PCBs and covers.
(4) Before handling any PCBs, touch a metal portion of the equipment to discharge any static
electricity charge on your body, or the electronic parts or components may be damaged.
(5) When transporting PCBs, be sure to wrap them in the correct protective packaging.
(6) Be sure to replace self-tapping screws correctly, if removed. Unless otherwise specified,
tighten screws to the following torque values.
TAPTITE, BIND or CUP B
TAPTITE, CUP S
SCREW
(7) When connecting or disconnecting cable connectors, hold the connector body, not the
cables. If the connector has a lock, release the connector lock first to release it.
(8) After a repair, check not only the repaired portion but also all connectors.
other related portions are functioning properly before operational checks.
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DISASSEMBLY AND RE-ASSEMBLY
W h e n o p e n i n g t h e f r o n t c o v e r o r re ar c o v e r t o a c c es s a n y p a rt s i n s i d e t h e
M3: 0.7N m

M4: 0.8N m

M3: 0.8N m

M3: 0.7N m

M4: 0.8N m

Brother 8840D Service Manual
MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN
WARNING
4-1
SERVICE MANUAL
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