Sony MDR-ZX770BN User manual

SERVICE MANUAL
Sony Video & Sound Products Inc.
9-896-156-02
2016H33-1
© 2016.08
MDR-ZX770BN/ZX770BT/
ZX780DC
SPECIFICATIONS
MDR-ZX770BN/ZX780DC
WIRELESS NOISE CANCELING STEREO HEADSET
MDR-ZX770BT
WIRELESS STEREO HEADSET
US Model
Canadian Model
MDR-ZX770BN/ZX770BT/ZX780DC
AEP Model
UK Model
Latin American Model
MDR-ZX770BN
E Model
Australian Model
Tourist Model
Russian Model
MDR-ZX770BN/ZX770BT
Ver. 1.1 2016.08
General
Communication system: BLUETOOTH Specification version 3.0
Output: BLUETOOTH Specification Power Class 2
Maximum communication range: Line of sight approx. 10 m
(30 ft)1)
Frequency band: 2.4 GHz band (2.4000 GHz - 2.4835 GHz)
Modulation method: FHSS
Compatible BLUETOOTH profiles2):
A2DP (Advanced Audio Distribution Profile)
AVRCP (Audio Video Remote Control Profile)
HFP (Hands-free Profile)
HSP (Headset Profile)
Supported Codec 3):SBC 4) , AAC 5) , aptX
Supported content protection method: SCMS-T
Transmission range (A2DP): 20 Hz - 20,000 Hz (Sampling
Included items:
Micro-USB cable (approx. 50 cm (19 3/4 in.)) (1)
Headphone cable (approx.1.2 m (47 1/4 in.)) (1)
Carrying pouch (1) (MDR-ZX770BN/ZX780DC only)
(MDR-ZX770BN/ZX780DC only)
(MDR-ZX770BN: US, Canadian, AEP, UK and Latin American/
ZX770BT: US and Canadian/ZX780DC only)
Reference Guide (1)
Quick Start Guide (1)
Other documents (1 set)
1) The actual range will vary depending on factors such as
obstacles between devices, magnetic fields around a
microwave oven, static electricity, reception sensitivity,
antenna’s performance, operating system, software
application, etc.
2) BLUETOOTH standard profiles indicate the purpose of
BLUETOOTH communications between devices.
3) Codec: Audio signal compression and conversion format
4) Subband Codec
5) Advanced Audio Coding
Wireless noise canceling stereo
headset (MDR-ZX770BN/ZX780DC)
Power source:
DC 3.7 V:Built-in lithium-ion rechargeable battery
DC 5 V: When charged using USB
Mass: Approx.245 g (8.64 oz)
Operating temperature: 0 °C to 40 °C (32 °F to 104 °F)
Usage hours:
When connecting via the BLUETOOTH device
Music playback time:
Max. 13 hours (NC ON), Max. 19 hours (NC OFF)
Communication time:
Max. 10 hours (NC ON), Max. 12 hours (NC OFF)
Standby time:
Max. 26 hours (NC ON), Max.150 hours (NC OFF)
When connecting via the headphone cable
Max. 24 hours (NC ON)
Note: Usage hours may be shorter depending on the
Codec and the conditions of use.
Charging time:
Approx. 2.5 hours
Note: Charging hours may be different depending on the
conditions of use.
Charging temperature: 5 °C to 35 °C (41 °F to 95 °F)
Receiver
Type: Closed, Dynamic
Driver units: 40 mm
Frequency response: 8 Hz - 22,000 Hz (when using the
headphone cable)
Maximum input: 100 mW (when using the headphone cable)
Impedance:
NC ON: 23 :(1 kHz) (when using the headphone cable)
NC OFF: 50 :(1 kHz) (when using the headphone cable)
Sensitivity:
NC ON: 98 dB/mW (when using the headphone cable)
NC OFF: 100 dB/mW (when using the headphone cable)
Microphone
Type: Electret condenser
Directivity: Omni directional
Effective frequency range: 100 Hz - 10,000 Hz
System requirements for battery
charge using USB
Personal Computer with pre-installed with any of the following
operating systems and USB port:
Operating Systems
(when using Windows)
Windows ®®
8.1 Pro
Windows
8.1 / Windows
8 / Windows
®®
8 Pro
Windows ®7
Home Basic / Home Premium / Professional / Ultimate
Windows Vista ®(Service Pack 2 or later)
Home Basic / Home Premium / Business / Ultimate
(when using Mac)
Mac OS X (version.10.3 or later)
Design and specifications are subject to change without notice.
frequency 44.1 kHz)
Rated power consumption: 1.5 W (Except US and Canadian models)
Wireless stereo headset (MDR-ZX770BT)
Power source:
DC 3.7 V:Built-in lithium-ion rechargeable battery
DC 5 V: When charged using USB
Mass: Approx.240 g (8.47 oz)
Operating temperature: 0 °C to 40 °C (32 °F to 104 °F)
(US and Canadian models)
Usage hours:
When connecting via the BLUETOOTH device
Music playback time: Max. 17 hours
Communication time: Max. 17 hours
Standby time: Max.450 hours
Note: Usage hours may be shorter depending on the
Codec and the conditions of use.
Charging time:
Approx. 2.5 hours
Note: Charging hours may be different depending on the
conditions of use.
Charging temperature: 5 °C to 35 °C (41 °F to 95 °F)
Receiver
Type: Closed, Dynamic
Driver units: 40 mm
Microphone
Type: Electret condenser
Directivity: Omni directional
Effective frequency range: 100 Hz - 10,000 Hz
Rated power consumption: 1.5 W (Except US and Canadian models)
5 °C to 35 °C (Except US and Canadian models)
Wireless noise canceling stereo headset (1)
Carrying case (1) (MDR-ZX780DC only)
USB charger (1) (MDR-ZX780DC only)
Wireless stereo headset (1) (MDR-ZX770BT only)
(MDR-ZX770BN/ZX780DC only)
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.
Photo: MDR-ZX770BN

MDR-ZX770BN/ZX770BT/ZX780DC
2
The BLUETOOTH word mark and logos are owned by the
Bluetooth SIG, Inc. and any use of such marks by Sony
Corporation is under license.
The N Mark is a trademark or registered trademark of NFC
Forum, Inc. in the United States and in other countries.
Microsoft, Windows and Windows Vista are registered
trademarks or trademarks of Microsoft Corporation in the
United States and/or other countries.
Mac and Mac OS are trademarks of Apple Inc., registered in the
U.S. and other countries.
iPhone is a trademark of Apple Inc., registered in the U.S. and
other countries.
The aptX mark and the aptX logo are trade marks of CSR plc
or one of its group companies and may be registered in one or
more jurisdictions.
Other trademarks and trade names are those of their respective
owners.
1. SERVICING NOTES ............................................. 3
2. DISASSEMBLY
2-1. Disassembly Flow........................................................... 4
2-2. Ear Pad............................................................................ 5
2-3. Cap Housing (L) Sub Assy (L-ch) .................................. 6
2-4. Front Plate (L) Sub Assy (DR1) (L-ch) .......................... 7
2-5. Ring (L), Electret Cap Microphone (MIC1) (L-ch)........ 8
2-6. NFC Module (RC-S711), MAIN Board (L-ch) .............. 9
2-7. Housing (L) (L-ch).......................................................... 10
2-8. Cap Housing (R) Sub Assy (R-ch).................................. 11
2-9. Front Plate (R) Sub Assy (DR2) (R-ch).......................... 12
2-10. Ring (R) (ZX770BN/ZX770BT/ZX780DC),
Electret Cap Microphone (MIC2) (R-ch)
(ZX770BN/ZX780DC)................................................... 12
2-11. SUB Board (R-ch) .......................................................... 13
2-12. Battery (R-ch) ................................................................. 14
2-13. Housing (R) (R-ch) ......................................................... 14
3. TEST MODE ............................................................. 15
4. EXPLODED VIEWS
4-1. Ear Pad Section............................................................... 17
4-2. Housing (L) Section........................................................ 18
4-3. Housing (R), Head Band Section.................................... 19
5. ACCESSORIES ....................................................... 20
TABLE OF CONTENTS
Ver. 1.1
MDR-ZX770BN/ZX770BT
MDR-ZX780DC
The BLUETOOTH word mark and logos are owned by the
Bluetooth SIG, Inc. and any use of such marks by Sony
Corporation is under license.
The N Mark is a trademark or registered trademark of NFC
Forum, Inc. in the United States and in other countries.
Microsoft, Windows and Windows Vista are registered
trademarks or trademarks of Microsoft Corporation in the
United States and/or other countries.
Mac and Mac OS are trademarks of Apple Inc., registered in the
U.S. and other countries.
iPhone is a trademark of Apple Inc., registered in the U.S. and
other countries.
Qualcomm® is a trademark of Qualcomm Incorporated,
registered in the United States and other countries, used with
permission. Qualcomm aptX™ audio is a trademark of
Qualcomm Technologies International, Ltd., registered in the
United States and other countries, used with permission.
Android and Google Play are trademarks of Google Inc.
Other trademarks and trade names are those of their respective
owners.
SAFETY-RELATED COMPONENT WARNING!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONC-
TIONNEMENT. NE REMPLACER CES COMPOSANTS QUE
PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DON-
NÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.

MDR-ZX770BN/ZX770BT/ZX780DC
3
SECTION 1
SERVICING NOTES
DESTINATION ABBREVIATIONS
The following abbreviations for model destinations are used in this
service manual.
• Abbreviations
AUS : Australian model
CND : Canadian models
JE : Tourist model
LA : Latin American model
RU : Russian model
CHECKING THE SERIAL NUMBER
The serial number of this unit can be checked on the rear side of the
housing the on the right unit.
Refer to the following figure.
Serial number label
NOTE FOR PARTS REPAIR OF BOARDS
When the boards installed in this unit are defective, replace the
complete mounted board or the whole parts including the complete
mounted board. The mounted parts cannot replace with single.
NOTE FOR REPLACING THE MAIN BOARD OR NFC
MODULE (RC-S711)
When replacing the MAIN board or NFC module (RC-S711), be
sure replace both simultaneously. It cannot replace either of one
of the MAIN board or NFC module (RC-S711). Among the repair
parts, the MAIN board and NFC module (RC-S711) are supplied
as one unit.
PROCESSING AFTER COMPLETION OF REPAIRS
After completion of repairs, be sure to perform the following pro-
cedure to initialize the unit.
Note 1: When this procedure is performed, all device pairing informa-
tion is erased and settings return to factory defaults.
When initializing the unit, it may be impossible to connect to
the iPhone and PC.
Procedure:
1. Press and hold the [POWER] button for 2 seconds or longer to
turn off the unit.
2. When pressing and holding the [POWER] button on the left
unit and the [NX/] button on the right unit simultaneously
for 7 seconds or longer, the lamp (blue color) flashes 4 times
and the settings return to factory defaults (initialization).
Note 2: All pairing information is deleted.
Blue
The SERVICING NOTES contains important information for servicing. Be sure to read this section before repairing the unit.

MDR-ZX770BN/ZX770BT/ZX780DC
4
SECTION 2
DISASSEMBLY
• This set can be disassembled in the order shown below.
2-1. DISASSEMBLY FLOW
SET
2-2. EAR PAD
(Page 5)
2-3. CAP HOUSING (L) SUB ASSY (L-ch)
(Page 6)
2-4. FRONT PLATE (L) SUB ASSY (DR1) (L-ch)
(Page 7)
2-6. NFC MODULE (RC-S711), MAIN BOARD (L-ch)
(Page 9)
2-7. HOUSING (L) (L-ch)
(Page 10)
2-5. RING (L),
ELECTRET CAP MICROPHONE (MIC1) (L-ch)
(Page 8)
2-8. CAP HOUSING (R) SUB ASSY (R-ch)
(Page 11)
2-9. FRONT PLATE (R) SUB ASSY (DR2) (R-ch)
(Page 12)
2-11. SUB BOARD (R-ch)
(Page 13)
2-12. BATTERY (R-ch)
(Page 14)
2-13. HOUSING (R) (R-ch)
(Page 14)
2-10. RING (R) (ZX770BN/ZX770BT/ZX780DC),
ELECTRET CAP MICROPHONE (MIC2) (R-ch)
(ZX770BN/ZX780DC)
(Page 12)
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
5
Note: Follow the disassembly procedure in the numerical order given.
2-2. EAR PAD
–R-ch –Note 2: Check the position of mark on top and
do not confuse the top and bottom.
Note 1: L-ch and R-ch can be similarly disassembled.
front plate
front plate ear pad
mark on top
housing
Inside color is [black].
2Remove the ear pad from the groove
between of front plate and housing.
3ear pad
1Pull the ear pad in the
direction of the arrow.
1Install the ear pad into the
groove between of front plate
and housing, then adjust the
ear pad to match the shape
of the groove of the housing.
2Massage surface of the ear pad
three times in the direction of the arrow.
3Massage surface of
the ear pad three
times in the direction
of the arrow.
ear pad
small curve
small curve
4Using a finger, insert it into
the area under the earpad,
hold and drag up in the
form earpad (anti-clockwise)
in the direction of the arrow.
5Using a finger, insert it into
the area under the earpad,
hold and drag up in the
form earpad (clockwise) in
the direction of the arrow.
–R-ch –
–Top view –
front plate
housing
+RZWRLQVWDOOWKHHDUSDG
$ERXWWKHGLIIHUHQFHLQWKHHDUSDGE\WKHPRGHO
(ZX770BN) (ZX770BT)
Inside color is [red].
(ZX780DC)
Inside color is [blue].
Note 3: When installing the earpad, confirm side of the earpad to ensure it is
definitely insert into the groove between plate front and housing.
Note 4: When installing the earpad, adjust
the shape of earpad.
Insert is flat. Insert is not fully.
OK NG
Insert is bumps up.
NG
nice egg shape askew
OK NG
OK NG
Note 6: When installing the earpad, both earpad need to adjust until
make sure small curve area must be at the bottom side.
Note 5: When installing the earpad,
adjust the shape of earpad and
confirm the direction of earpad
is facing up.
mark on top
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
6
2-3. CAP HOUSING (L) SUB ASSY (L-ch)
–L-ch –
JIG
When disassembling the unit, use the following jig.
Part No. Description
9-913-402-33 TOOL FOR DISASSEMBLING
1Set the cap housing (L)
sub assy facing up.
Note 3: Insert the jig from here.
Note 2: When using a jig, please
work so as not to injure
NFC module (RC-S711).
Note 1: When using a jig, please work
so as not to injure cap ring.
2 Insert the jig into the cap housing (L)
sub assy and raise it.
6 cap housing (L) sub assy
(ZX770BN/ZX780DC)
(ZX770BN/ZX780DC)
cap ring
total four claws
jig
3 All claws are removed while moving jig
in the direction of the arrow, and cap
housing (L) sub assy is removed.
5 cap ring
Note 4: When installing the cap housing (L) sub assy,
align four claws of cap housing (L) sub assy
with four holes of front (L) plate.
Note 5: When installing the cap ring,
align three pins of cap ring with
three holes of front (L) plate.
4Remove the cap ring and
cap housing (L) sub assy
in the direction of the arrow.
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
7
2-4. FRONT PLATE (L) SUB ASSY (DR1) (L-ch)
–L-ch –
4three screws
5Remove the front plate (L) sub assy
in the direction of the arrow.
7Remove the solder.
[natural]
6Remove two wires
from the claw.
7Remove the solder.
[red]
3screw
8front plate (L) sub
assy (DR1)
2NFC module block
(RC-S711)
1Peel off the
battery adhesive.
:LUH VHWWLQJ
MAIN board
claw driver cable
ditch
housing (L) block
[natural] [red]
%DWWHU\ DGhHVLYH VHWWLQJ
guide line
battery adhesive
1)& PRGXOH EORcN5&-6 VHWWLQJ
guide line
NFC module block
(RC-S711)
NFC module block
(RC-S711)
Note: When installing the front plate (L)
sub assy, align three holes of front
plate (L) sub assy with three screw
holes of housing (L) block.

MDR-ZX770BN/ZX770BT/ZX780DC
8
2-5. RING (L), ELECTRET CAP MICROPHONE (MIC1) (L-ch)
5Remove the microphone block
in the direction of the arrow.
4Remove the solder.
[red]
4Remove the solder.
[natural]
8electret cap microphone (MIC1)
7mic sheet
6mic holder
microphone
holder
:LUHVHWWLQJ
MAIN board
[natural]
[red]
(ZX770BN/ZX780DC)
–/FK–
2ring (L)
3button power sub ass
y
1claw
1claw
hole
hole
rib hole
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
9
2-6. NFC MODULE (RC-S711), MAIN BOARD (L-ch)
Note: When replacing the MAIN board or NFC module (RC-S711), be sure replace both simultaneously. It cannot replace either of one of the
MAIN board or NFC module (RC-S711). Among the repair parts, the MAIN board and NFC module (RC-S711) are supplied as one unit.
8Remove seven solders.
5Remove the jack from the hole.
–L-ch –
:LUHVHWWLQJ
:LUHVHWWLQJ
4screw
5Remove the connector from the hole.
9MAIN board
1sheet driver
(dressing)
2Remove two solders.
[blue]
7sheet (M)
8Remove three solders.
3NFC module
(RC-S711) block 6Remove the MAIN board block
in the direction of the arrow.
:LUHVHWWLQJ
MAIN board
MAIN board
MAIN board
relay cable
groove
[black]
relay cable
[green]
[red]
[red/natural]
[white]
[yellow]
[green/natural]
sheet (M)
wire [blue]
wire [blue]
sheet driver (dressing)
NFC module
two wires
MAIN board MAIN board
NFC module
MAIN board for repair (with NFC module)
Repair parts are supplied together with parts that include the NFC module and the MAIN board that connected by the wire.
When replacing the NFC module or the MAIN board, remove the wire from the MAIN board.
two solders
1RWHRIUHSODFLQJWKH1)&PRGXOHRUWKH0$,1ERDUG
Remove two wires
from the MAIN board.
=;%1=;'&
=;%1=;'&
=;%7
=;%1=;'&
MAIN board
relay cable
[red/green]
[black]
[blue]
[green]
[red]
[natural]
[red/natural]
[white]
[yellow]
[green/natural]
sheet (M)
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
10
2-7. HOUSING (L) (L-ch)
7housing (L)
1Remove the shaft of
head band assy from
the housing (L).
2Remove the shaft of head band
assy from the housing (L).
4power light guide
5NC light guide
6NC button
3Draw out the wire.
–L-ch –
(ZX770BN/ZX780DC)
1&EXWWRQVHWWLQJ
rib
hole
housing (L)
NC button
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
11
2-8. CAP HOUSING (R) SUB ASSY (R-ch)
–R-ch –
JIG
When disassembling the unit, use the following jig.
Part No. Description
9-913-402-33 TOOL FOR DISASSEMBLING
2 Insert the jig into the cap housing (R)
sub assy and raise it.
6 cap housing (R) sub assy
total four claws
jig
3 All claws are removed while moving jig
in the direction of the arrow, and cap
housing (R) sub assy is removed.
Note 2: Insert the jig from here.
Note 3: When installing the cap housing (R) sub assy,
align four claws of cap housing (R) sub assy
with four holes of front (R) plate.
1Set the cap housing (R)
sub assy facing up.
Note 1: When using a jig, please work
so as not to injure cap ring.
(ZX770BN/ZX780DC)
cap ring
(ZX770BN/ZX780DC)
5 cap ring
Note 4: When installing the cap ring,
align three pins of cap ring with
three holes of front (R) plate.
4Remove the cap ring and
cap housing (R) sub assy
in the direction of the arrow.
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
12
2-9. FRONT PLATE (R) SUB ASSY (DR2) (R-ch)
2-10. RING (R) (ZX770BN/ZX770BT/ZX780DC),
ELECTRET CAP MICROPHONE (MIC2) (R-ch) (ZX770BN/ZX780DC)
–R-ch –
3Remove the front plate (R) sub assy
in the direction of the arrow.
5Remove the solder.
[natural]
5Remove the solder.
[red]
4sheet driver
(dressing)
2three screw
s
1screw
7front plate (R) sub assy (DR2)
front plate (R) sub assy
(DR2)
6Remove two wires
from the claw.
:LUH VHWWLQJ  :LUH VHWWLQJ
SUB board
driver cable
driver cable
[natural] [red]
claw ditch sheet driver
(dressing)
–R-ch –
2ring (R)
1claw
1claw
hole
hole
4Remove the microphone
block in the direction of
the arrow.
3Remove the solder.
[red]
3Remove the solder.
[natural]
7electret cap microphone
(MIC2)
6mic sheet
5mic holder
:LUHVHWWLQJ
SUB board
[natural]
[red]
(ZX770BN/ZX780DC)
microphone
holder
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
13
2-11. SUB BOARD (R-ch)
+RZWRLQVWDOOWKH-2*EXWWRQ
:LUHVHWWLQJ
:LUHVHWWLQJ
8SUB board
5sheet (PWB)
SUB board
relay cable
SUB board
[green]
[red/green]
[red]
[green]
[black]
[red]
[blue]
[black]
JOG button
SUB board
hole
rib
[red/natural]
[green/natural]
[yellow]
[red/natural]
[white]
[yellow]
[green/natural]
[natural]
[white]
sheet (PWB)
relay cable sheet (PWB)
7JOG button
(ZX770BN/ZX780DC)
(ZX770BT)
2Remove the solder.
[black]
2Remove the solder.
[red]
–5FK–
1screw
rib
rib
4Remove the SUB board block
in the direction of the arrow.
3Remove the JOG button
from the hole.
Note: When installing the SUB board block,
align two holes of SUB board with
two ribs of housing (R).
[black] [red] SUB board
battery sub assy
6Remove three solders.
6Remove seven solders.
(ZX770BN/ZX780DC)
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
14
2-12. BATTERY (R-ch)
%DWWHU\VHWWLQJ
3battery (BAT1)
–5FK–
1Peel off the adhesive battery.
2Remove the battery (BAT1)
in the direction of the arrow.
battery (BAT1)
guide line
Note: If removing the battery adhesive tape
of battery (BAT1), can not be re-used
battery (BAT1).
Replace the new parts always.
2-13. HOUSING (R) (R-ch)
7housing (R)
1Remove the shaft of head band
assy from the housing (R).
–R-ch –
2Remove the shaft of head band
assy from the housing (R).
3Draw out the wire.
4volume button
6adhesive battery
5volume cushion
5volume cushion
9ROXPHEXWWRQVHWWLQJ
rib
hole
volume button
housing (R)
housing (R)
guide line
(center)
volume cushion
adhesive battery
$GKHVLYHEDWWHU\VHWWLQJ
9ROXPHFXVKLRQVHWWLQJ
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
15
SECTION 3
TEST MODE
NOISE CANCEL VOLUME ADJUSTMENT
(MDR-ZX770BN/ZX780DC only)
When the complete mounted board or driver section of this unit is
replaced, be sure to perform the noise cancel volume adjustment.
1. Preparation of adjustment
Prepare the following before adjustment.
• AF oscillator
• Amplifier
• Speaker
• Headphone cable (Supplied accessories)
Connection:
+
–
amplifier
speaker
AF oscillator
2. Setting the noise cancel volume adjustment mode
Procedure:
1. Headphone cable is connected to the [INPUT] jack in the state
of the power off.
To [INPUT] jack
Headphone
cable
–L-ch –
–R-ch –
No connection
2. While pressing the [NC] button, press and hold (2 seconds) the
[POWER] button.
Press the button as following order.
[VOL+] →[VOL+] (hold for 2 seconds) →[VOL–] →
[VOL–] (hold for 2 seconds) →[POWER] →[POWER] (hold
for 2 seconds)
Note: When operation is not completed within 1 minute or procedure
is mistaken, it does not enter the adjustment mode. Please turn
the power off and redo from step 1.
–L-ch –
[POWER]
button
[NC]
button
–R-ch –
[VOL+]
button
[VOL–]
button
3. Enter the noise cancel volume adjustment mode (L-ch), and
the LED of [NC] button blinks (cycle of the 500 ms).
–L-ch –
LED of [NC] button blinks
(cycle of the 500 ms)
3. Deactivating the noise cancel volume adjustment
mode
When the adjustment value is set and saved:
Press and hold (2 seconds) the [NC] button, and deciding the ad-
justment value, adjustment mode is released and it changes to the
normal mode.
When canceling without saving the adjustment value:
Press and hold (2 seconds) the [POWER] button to turn the power
off, or the headphone cable is pulled out to turn the power off.
4. Noise cancel volume adjustment operation
Procedure:
1. Enter the noise cancel volume adjustment mode, and the noise
cancel volume of a L-ch and R-ch will become a center value.
(Refer to “2. Setting the noise cancel volume adjustment
mode”)
2. Check that the LED of [NC] button blinks cycle of the 500 ms
and has become L-ch adjustment.
(R-ch adjustment blinking cycle of the 160 ms)
Slide the [NX/] button in the direction of [>](FF), it
will change to R-ch adjustment, and if it slide the direction of
[.](REW), it will change to L-ch adjustment.
–L-ch –
LED of [NC] button blinks
(cycle of the 500 ms)
–R-ch –
L-ch
adjustment
(REW)
3. Generate a sine wave of frequency (160 Hz) from a AF oscilla-
tor, and output it from the forward speaker.
4. Set this unit over your ears.
5. Press the [VOL+]/[VOL–] buttons and adjust it so the volume
for frequency 160 Hz is as quiet as possible.
Press the [VOL+] button, noise cancel volume increases 0.8
db.
Press the [VOL–] button, noise cancel volume decreases 0.8
db.
When noise cancel volume becomes the center value, the beep
sound of “Duhlala” sounds.
When noise cancel volume becomes the maximum or the mini-
mum, the beep sound of “Dun Dun” sounds.
– Continued on next page –
Ver. 1.1

MDR-ZX770BN/ZX770BT/ZX780DC
16
6. Remove the unit and slide the [NX/] button in the direc-
tion of [>](FF).
Check that the LED of [NC] button blinks cycle of the 160 ms
and has become R-ch adjustment.
–L-ch –
LED of [NC] button blinks
(cycle of the 160 ms)
–R-ch –
R-ch
adjustment
(FF)
7. Set this unit over your ears.
8. Refer to step 5 for R-ch adjustment, R-ch adjustment is the
same as L-ch adjustment.
9. After adjustment of both L-ch and R-ch is completed, press
and hold (2 seconds) the [NC] button and the adjustment value
is set.
If it set and saved, the beep sound of “Ding dong” sounds.
10. Press and hold (2 seconds) the [POWER] button to turn the
power off.
11. Press and hold (2 seconds) the [POWER] button to turn the
power on. Check that sound of frequency 160 Hz outputted
from the forward speaker is canceled as according to setting.

17
MDR-ZX770BN/ZX770BT/ZX780DC
SECTION 4
EXPLODED VIEWS
1 4-559-815-01 PAD, EAR (ZX770BN)
1 4-559-815-11 PAD, EAR (ZX780DC)
1 4-570-071-01 PAD, EAR (ZX770BT)
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
Note:
• -XX and -X mean standardized parts, so
they may have some difference from the
original one.
• Items marked “*” are not stocked since
they are seldom required for routine ser-
vice. Some delay should be anticipated
when ordering these items.
• The mechanical parts with no reference
number in the exploded views are not sup-
plied.
• Color Indication of Appearance Parts Ex-
ample:
KNOB, BALANCE (WHITE) . . . (RED)

Parts Color Cabinet’s Color
4-1. EAR PAD SECTION
• Front view
• Color variations
MDR-ZX770BN
(B) BLACK: All models
(L) BLUE : Except LA model
MDR-ZX770BT
(B) BLACK, (L) BLUE
MDR-ZX780DC
(B) BLACK
– R-ch –
– L-ch –
housing (L) section
1
1
Ver. 1.1

18
MDR-ZX770BN/ZX770BT/ZX780DC
60
58
56
57
55
59
61
62
MIC1
51
51
51
52
51
51
53
54
NFC module
(RC-S711)
(See Note 1)
included in Ref. No. 54
(ZX770BN/
ZX780DC)
(ZX770BN/ZX780DC)
(ZX770BN/
ZX780DC)
(ZX770BN/ZX780DC)
not
supplied
housing (R), head band section
not
supplied
MAIN
board
J101
DR1
not supplied
–R-ch –
–L-ch –
A
A
51 3-254-058-21 SCREW
52 A-2143-127-A BUTTON POWER SUB ASSY, SVX (for BLACK)
(ZX780DC)
52 X-2591-397-1 BUTTON POWER SUB ASSY (SV) (for BLACK)
(ZX770BN/ZX770BT)
52 X-2591-398-1 BUTTON POWER SUB ASSY (SV) (for BLUE)
(ZX770BN: Except LA/ZX770BT)
53 4-564-489-02 RING (L) (for L-ch) (for BLACK)
(ZX770BN/ZX770BT)
53 4-564-489-12 RING (L) (for L-ch) (for BLUE)
(ZX770BN: Except LA/ZX770BT)
53 4-564-489-21 RING (L) (for L-ch) (for BLACK) (ZX780DC)
54 A-2074-945-A MAIN BOARD, COMPLETE (SV)
(Including NFC module (RC-S711), WIRE,
SEAL SHEET, JACK) (ZX770BN) (See Note 1)
54 A-2074-946-A MAIN BOARD, COMPLETE (SV) (Including NFC
module (RC-S711), WIRE) (ZX770BT) (See Note 1)
54 A-2143-199-A MAIN BOARD, COMPLETE (SV)
(Including NFC module (RC-S711), WIRE,
SEAL SHEET, JACK) (ZX780DC) (See Note 1)
55 4-545-633-01 HOLDER, MIC
56 4-559-812-02 BUTTON, NC (NC) (ZX770BN)
56 4-559-812-11 BUTTON, NC (NC) (ZX780DC)
57 4-559-813-01 LIGHT GUIDE, NC (ZX770BN/ZX780DC)
58 4-559-814-01 LIGHT GUIDE, POWER
59 4-559-810-03 HOUSING (L) (for L-ch) (ZX770BN)
59 4-559-810-12 HOUSING (L) (for L-ch) (ZX780DC)
59 4-559-811-02 HOUSING (L) (for L-ch) (ZX770BT)
60 4-478-790-01 ADHESIVE, BATTERY
61 4-564-490-02 RING, CAP (ZX770BN)
61 4-564-490-11 RING, CAP (ZX780DC)
62 X-2591-395-2 CAP HOUSING (L) SUB ASSY (SV) (for L-ch)
(ZX770BN/ZX780DC)
62 X-2591-396-2 CAP HOUSING (L) SUB ASSY (SV) (for L-ch)
(ZX770BT)
DR1 A-2074-944-A PLATE, FRONT (L) SUB ASSY (SV) (for L-ch)
(Including DRIVER, DRIVER WIRE)
(ZX770BN/ZX770BT) (See Note 2)
DR1 A-2129-962-A PLATE, FRONT (L) SUB ASSY, SVX (for L-ch)
(Including DRIVER, DRIVER WIRE)
(ZX780DC) (See Note 2)
J101 1-779-881-11 JACK (INPUT) (Included in MAIN board)
(ZX770BN/ZX780DC)
MIC1 1-542-974-31 MICROPHONE, ELECTRET CAP (Including WIRE)
(ZX770BN/ZX780DC)
MIC1 1-852-043-11 MICROPHONE, ELECTRET CAP (Including WIRE)
(ZX770BT)
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
4-2. HOUSING (L) SECTION
• Rear view
Note 1: When replacing the MAIN board or NFC module (RC-S711), be sure
replace both simultaneously. It cannot replace either of one of the
MAIN board or NFC module (RC-S711). Among the repair parts, the
MAIN board and NFC module (RC-S711) are supplied as one unit.
Note 2: When replacing the front plate (L) sub assy (Ref. No. DR1),
refer to the “TEST MODE” (page 15).
Ver. 1.1

19
MDR-ZX770BN/ZX770BT/ZX780DC
(ZX770BN/ZX780DC)
(ZX770BN/
ZX780DC)
101
–R-ch –
–L-ch –
HB1
105
107
108
109
110
not
supplied
not
supplied
not
supplied
not
supplied
not
supplied
101
101
101
DR2
103
101
102 MIC2
BAT1
106
104
4-3. HOUSING (R), HEAD BAND SECTION
• Front view
Note 1: If removing the battery (Ref. No. BAT1) from battery adhesive,
can not be re-used it. Replace the new parts always.
Note 2: When replacing the front plate (R) sub assy (Ref. No. DR2),
refer to the “TEST MODE” (page 15).
101 3-254-058-21 SCREW
102 4-545-633-01 HOLDER, MIC (ZX770BN/ZX780DC)
103 4-559-824-01 BUTTON, JOG (., / Xb, >)
(ZX770BN/ZX770BT)
103 4-559-824-11 BUTTON, JOG (., / Xb, >) (ZX780DC)
104 A-2069-946-A SUB, BOARD, COMPLETE (ZX770BN/ZX780DC)
104 A-2069-948-A SUB, BOARD, COMPLETE (ZX770BT)
105 4-564-493-02 RING (R) (for R-ch) (for BLACK)
(ZX770BN/ZX770BT)
105 4-564-493-12 RING (R) (for R-ch) (for BLUE)
(ZX770BN: Except LA/ZX770BT)
105 4-564-493-21 RING (R) (for R-ch) (for BLACK) (ZX780DC)
106 4-478-790-01 ADHESIVE, BATTERY
107 4-559-823-01 BUTTON, VOLUME (+ VOLUME –)
(ZX770BN/ZX770BT)
107 4-559-823-11 BUTTON, VOLUME (+ VOLUME –) (ZX780DC)
108 4-559-822-01 HOUSING (R) (for R-ch) (ZX770BN)
108 4-559-822-11 HOUSING (R) (for R-ch) (ZX780DC)
108 4-564-494-01 HOUSING (R) (for R-ch) (ZX770BT)
109 4-564-490-02 RING, CAP (ZX770BN)
109 4-564-490-11 RING, CAP (ZX780DC)
110 X-2591-401-2 CAP HOUSING (R) SUB ASSY (SV) (for R-ch)
(ZX770BN/ZX780DC)
110 X-2591-402-2 CAP HOUSING (R) SUB ASSY (SV) (for R-ch)
(ZX770BT)
BAT1 1-853-017-13 BATTERY, STORAGE, LITHIUM
(E, AUS, JE, RU) (See Note 1)
BAT1 A-2075-160-B BATTERY SUB ASSY (SV)
(US, CND, AEP, UK, LA) (See Note 1)
DR2 A-2075-159-A PLATE, FRONT(R) SUB ASSY (SV) (for R-ch)
(Including DRIVER, DRIVER WIRE)
(ZX770BN/ZX770BT) (See Note 2)
DR2 A-2129-963-A PLATE, FRONT (R) SUB ASSY, SVX (for R-ch)
(Including DRIVER, DRIVER WIRE)
(ZX780DC) (See Note 2)
HB1 A-2074-932-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(for BLACK) (ZX770BN: E, AUS, JE, RU)
HB1 A-2074-933-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(for BLACK) (ZX770BN: US, CND)
HB1 A-2074-934-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(for BLACK) (ZX770BN: AEP, UK)
HB1 A-2074-935-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(ZX770BN: LA)
HB1 A-2074-937-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(for BLUE) (ZX770BN: E, AUS, JE, RU)
HB1 A-2074-938-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(for BLUE) (ZX770BN: US, CND)
HB1 A-2074-939-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(for BLUE) (ZX770BN: AEP, UK)
HB1 A-2074-940-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(for BLACK) (ZX770BT: E, AUS, JE, RU)
HB1 A-2074-941-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(for BLACK) (ZX770BT: US, CND)
HB1 A-2074-942-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(for BLUE) (ZX770BT: E, AUS, JE, RU)
HB1 A-2074-943-A HEADBAND ASSY (SV) (Including RELAY CABLE)
(for BLUE) (ZX770BT: US, CND)
HB1 A-2127-588-A HEADBAND ASSY (FOR SVX)
(Including RELAY CABLE) (for BLACK) (ZX780DC)
MIC2 1-542-974-31 MICROPHONE, ELECTRET CAP (Including WIRE)
(ZX770BN/ZX780DC)
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
Ver. 1.1

Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
MDR-ZX770BN/ZX770BT/ZX780DC
20
SECTION 5
ACCESSORIES
4-559-832-11 GUIDE, QUICK START (ENGLISH, SPANISH,
FRENCH) (ZX770BN: US, CND)
4-559-832-31 GUIDE, QUICK START (ENGLISH, RUSSIAN,
TRADITIONAL CHINESE, KOREAN)
(ZX770BN: E, AUS, JE, RU)
4-559-832-41 GUIDE, QUICK START (ENGLISH, FRENCH,
GERMAN, SPANISH, DUTCH, ITALIAN, POLISH,
HUNGARIAN) (ZX770BN: AEP, UK)
4-559-832-51 GUIDE, QUICK START (PORTUGUESE, GREEK,
CZECH, BULGARIAN, SLOVAK, SLOVENIAN,
ROMANIAN) (ZX770BN: AEP, UK)
4-559-832-61 GUIDE, QUICK START (ENGLISH, SPANISH,
PORTUGUESE) (ZX770BN: LA)
4-559-833-11 GUIDE, REFERENCE (ENGLISH, SPANISH,
FRENCH) (ZX770BN: US, CND)
4-559-833-32 GUIDE, REFERENCE (ENGLISH, RUSSIAN,
TRADITIONAL CHINESE, KOREAN)
(ZX770BN: E, AUS, JE, RU)
4-559-833-41 GUIDE, REFERENCE (ENGLISH, FRENCH,
GERMAN, SPANISH, DUTCH, ITALIAN, POLISH,
HUNGARIAN) (ZX770BN: AEP, UK)
4-559-833-51 GUIDE, REFERENCE (PORTUGUESE, GREEK,
CZECH, BULGARIAN, SLOVAK, SLOVENIAN,
ROMANIAN) (ZX770BN: AEP, UK)
4-559-833-61 GUIDE, REFERENCE (ENGLISH, SPANISH,
PORTUGUESE) (ZX770BN: LA)
4-564-472-11 GUIDE, QUICK START (ENGLISH, SPANISH,
FRENCH) (ZX770BT: US, CND)
4-564-472-31 GUIDE, QUICK START (ENGLISH, RUSSIAN,
TRADITIONAL CHINESE, KOREAN, UKRAINIAN)
(ZX770BT: E, AUS, JE, RU)
4-564-473-11 GUIDE, REFERENCE (ENGLISH, SPANISH,
FRENCH) (ZX770BT: US, CND)
4-564-473-32 GUIDE, REFERENCE (ENGLISH, RUSSIAN,
TRADITIONAL CHINESE, KOREAN, UKRAINIAN)
(ZX770BT: E, AUS, JE, RU)
4-596-342-11 MANUAL, INSTRUCTION (Operating Instructions)
(ENGLISH, FRENCH) (ZX780DC)
4-596-345-11 REFERENCE GUIDE (ENGLISH, FRENCH)
(ZX780DC)
502
Headphone cable (approx. 1.2 m) (1)
503
Carrying pouch (1)
501
Micro-USB cable (approx. 50 cm) (1)
(ZX770BN)
502
Headphone cable (approx. 1.2 m) (1)
503
Carrying pouch (1)
501
Micro-USB cable (approx. 50 cm) (1)
(ZX780DC)
501
Micro-USB cable (approx. 50 cm) (1)
(ZX770BT)
504
Carrying case (1)
505
USB charger (1)
Ver. 1.1
501 1-848-682-11 CABLE, CONNECTION (USB)
(Micro-USB cable (approx. 50 cm))
502 1-846-746-62 CABLE (WITH PLUG) (Headphone cable
(approx. 1.2 m)) (ZX770BN/ZX780DC)
503 4-564-470-01 POUCH, CARRYING (ZX770BN/ZX780DC)
504 4-539-657-01 CASE, CARRYING (ZX780DC)
0505 1-493-084-12 AC ADAPTOR (USB charger) (AC-UUD12)
(ZX780DC)
The components identified by mark 0
or dotted line with mark 0are critical for
safety.
Replace only with part number specified.
Les composants identifiés par une marque
0sont critiques pour la sécurité.
Ne les remplacer que par une pièce por-
tant le numéro spécifié.