Sony WH-1000XM4 Service Manual page 20

WH-1000XM4
DISASSEMBLY PROHIBITION AND PARTS REPLACEMENT
THAT AFFECT THE NOISE CANCELING FUNCTION
The precise noise canceling function of this unit is adjusted in the
production process.
Therefore, it is not possible to disassemble the portion aff ecting the
adjustment of the noise canceling function or to replace the single
parts aff ecting it.
Be sure to refer to the below before disassembling this unit.
• Disassembly Prohibition of Front Plate Portion
Do not disassemble the left and right front plate portion.
If disassembling the front plate portion, malfunction will occur in
adjustment value of the noise canceling function.
Note 1: Do not touch the rear resistor (left).
Noise canceling performance etc.
might be affected.
– Left front plate interior
(internal side) –
Disassembly of parts other
than ornament, MAIN L
board and NFC L board
are prohibited.
Note 2: Do not touch the rear resistor (right).
Noise canceling performance etc.
might be affected.
– Right front plate interior
(internal side) –
Disassembly of parts other
than ornament, SUB R board,
THM R board and lithium ion
storage battery are prohibited.
20
– Left front plate interior
(front side) –
Disassembly of parts other
than earpad, screen and
ornament fixing screw are
prohibited.
– Right front plate interior
(front side) –
Disassembly of parts other
than earpad, screen and
ornament fixing screw are
prohibited.
• Parts Replacement
It is not possible for replacement of left and right front plate portion,
or replacement of electret cap microphone only.
When the left and right front plate portion or electret cap micro-
phone is defective, replace with the SV headphones assy (EXPLOD-
ED VIEWS: Ref. No. HPN1) including them.
front plate portion (L-ch)
– Left front plate inner view –
electret cap
microphone
– L-ch –
SV headphones assy
(EXPLODED VIEWS: Ref. No. HPN1)
(Refer to "COMPONENT PARTS OF SV HEADPHONES ASSY"
on page 22 for component parts of SV headphones assy)
Sony CONFIDENTIAL
For Authorized Servicer
front plate portion (R-ch)
– Right front plate inner view –
electret cap
microphone
– R-ch –
SYS SET