Sony MDR-NC11A - Noise Canceling Headphone Service Manual Download Page 3

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MDR-NC11A

SECTION  2

GENERAL

Features

Noise canceling headphones reduce ambient noise,  and
provide a quieter environment to enhance audio
entertainment.  Ambient sound is synthesized with an
anti-sound signal produced by the noise canceling circuit,
and reduced.

Ultra compact earphones with 9mm driver unit fits
comfortably in the ear and closed type earphone structure
delivers deep bass sound.

Soft silicon rubber earbuds are used for stable and
comfortable fit in the ears.

Volume control function for easy connecting to your
portable audio player.

New earphone holder minimizes cord tangles during
strage.

Operates as passive headphones when noise canceling
circuit is not activated.

Plug adaptor is supplied to connect directly to stereo or
dual jack of inflight music services.

Installing a battery
1

Open the lid on the rear side of the battery box.

2

Insert one R03 (size AAA) battery by matching
the + and 

 on the battery to the + and 

 in the

battery box.

3

Close the lid.

Battery life

When to replace the battery

Replace the battery with a new one when the POWER
indicator dims.

Battery

Sony alkaline battery LR03/AM-
4 (N)

Sony battery R03/UM-4 (NU)

Approx. hours

40 hours

20 hours

Selecting the
earbuds

The M size earbuds are attached to the headphones before
shipment. If you feel the M size earbuds do not suit your
ears, replace them with the supplied S or L size earbuds.

Plug adaptor (supplied)

When connecting to dual or
stereo mini jacks of in-flight
musicservices.

PC-MP1HG
(not supplied)

When connecting to the
remote control of a
WALKMAN*, etc.

To headphone jack
on airplane seats

When connecting to the
headphone jack (stereo mini
jack) of a WALKMAN*, etc.

2

Wear the headphones marked 

R

 in your right

ear and the one marked 

L

 in your left ear. Push

the earbud into your ear carefully so that the
earbud fits the hole of your ear snugly.

Note

Unless the headphones correctly fit your ears, noise
canceling will not function.
Adjust the earbuds position to sit on your ear comfortably,
and push them into the inside of your ears so that they fit
your ears snugly.

3

Turn on the power of the headphones.
The power indicator lights in red.  The power
switch is located on the battery box.  When
power is turned on, ambient noise is reduced,
and you can listen to music more clearly at a
lower volume.

4

Turn on the power of the AV equipment.

5

Adjust the volume.
Turn the VOL control.
(If you turn down the volume, the sound does
not mute completely.)

Notes on using on the airplane

The supplied plug adaptor can be connected to dual and
stereo mini jacks.

Do not use the headphones when use of electronic
equipment is prohibited or when use of personal
headphones for inflight music services is prohibited.

If you have any questions or problems concerning the
system that are not covered in this manual, please consult
the nearest Sony dealer.

After listening to music

Turn off the power of the headphones.

Notes

The noise canceling function is only effective for noise in the
low frequency band.  Although noise is reduced, it is not
canceled completely.

Do not cover the microphone of the headphones with your
hands. The noise canceling function may not work properly.

The noise canceling function may not work properly unless
the headphones are put on firmly.

You can use the headphones even without turning on the
power.  In this case, the noise canceling function is not active,
and the headphones operate as passive headphones.

After you turn on the power of the headphones, you may hear
a slight hiss. This is the operating sound of the noise canceling
function, not a malfunction.

In a quiet place, or depending on certain noises, you may feel
that the noise canceling function is not effective, or that noise
is accentuated. In this case, turn off the power of the
headphone.

Interference noise can occur from nearby cellular phones.
Should this occur, locate the headphones further away from
the cellular phone(s).

Using the clip

You can fasten the battery box by its clip on a shirt pocket.

When carrying the headphones

You can attach the headphones to the supplied holder to
keep them together. The headphones and the battery box
can also be separately stored in the partitioned carrying case
(supplied).

While using the headphones, you can attach the holder to
the headphone cord.

Clip

Precautions

Clean the headphones with a soft dry cloth.

Do not leave the jackplug dirty otherwise the sound may
be distorted.

Be sure to bring the headphones to the Sony dealer when
requiring a  change of earbuds or repair work.

The CE mark on the unit is valid only for products
marketed in the European Union.

Do not leave the headphones in a location subject to direct
sunlight, heat or moisture.

Do not subject the headphones to excessive shock.

Handle the driver units carefully.

To clean the earbuds, first remove them from the
headphones, and then clean them with water and mild
detergent. After cleaning, dry each earbud carefully
before use.

The earbuds will need to be replaced from time to time. If
they are worn out by daily use or longtime storage,
replace them with new ones.

If you fell drowsy or sick while using these headphones,
stop use immediately.

Notes on headphones
Preventing hearing damage

Avoid using headphones at high volume.  Hearing experts
advise against continuous, loud and extended play.  If you
experience a ringing in your ears, reduce the volume or
discontinue use.

Do not use headphones while driving and
cycling, etc.

As headphones reduce outside sounds, they may cause a
traffic accident.  Also, avoid listening with your headphones
in situations where hearing must not be impaired, for
example, a railroad crossing, a construction site, etc.

Holder

Holder

Insert the 

#

 end first.

POWER

ON

OFF

Microphone

L

R

L

VOL

VO

L

dual jacks

stereo mini jacks

* WALKMAN is a registered trademark of Sony

Corporation.

Listening to music
1

Connect the headphones to the AV equipment.

This section is extracted from
instruction manual.

Summary of Contents for MDR-NC11A - Noise Canceling Headphone

Page 1: ...acity 50 mW Impedance 20 ohms at 1 kHz when the power is on 8 ohms at 1 kHz when the power is off Sensitivity 102 dB mW when the power is on 98 dB mW when the power is off Frequency response 10 22 000 Hz Frequency range of active noise attenuation 50 1 500 Hz more than 10 dB at 300 Hz Power source DC 1 5 V 1 R03 size AAA battery Mass Approx 47 g 1 7 oz including batterybox cord and battery Supplie...

Page 2: ...2 MDR NC11A SECTION 1 SERVICING NOTE red white black brown blue yellow green red main board conductor side WIRING DIAGRAM ...

Page 3: ...music Turn off the power of the headphones Notes The noise canceling function is only effective for noise in the low frequency band Although noise is reduced it is not canceled completely Do not cover the microphone of the headphones with your hands The noise canceling function may not work properly The noise canceling function may not work properly unless the headphones are put on firmly You can ...

Page 4: ...n on the POWER switch 3 With this headphones mounted adjust the RV1 L ch and RV51 R ch so that the volume from the speaker becomes lowest aurally Note When the headphones are not covered with the ear pieces completely the adjustment may not be performed correctly Make sure that the ear pieces cover the headphone completely Adjustment Location MAIN BOARD Component Side amplifier speaker AF oscillat...

Page 5: ...WER OFF Voltages are taken with aVOM Input impedance 10 MΩ Voltage variations may be noted due to normal produc tion tolerances Waveforms are taken with a oscilloscope Voltage variations may be noted due to normal produc tion tolerances Circled numbers refer to waveforms Signal path F LINE INPUT POWER ON J LINE INPUT POWER OFF Note on Printed Wiring Board X parts extracted from the component side ...

Page 6: ... 4 µs 70 mVp p 2 Q201 1 Base 200 mV DIV 20 µs DIV 36 4 µs 1 1 Vp p 4 Q201 2 Base 200mV DIV 20 µs DIV 36 4 µs 0 8 Vp p 3 Q201 1 Collector Q202 1 Base 200mV DIV 20 µs DIV 36 4 µs 0 8 Vp p 5 Q201 2 Collector Q202 1 Collector Q202 2 Base 200 mV DIV 20 µs DIV 36 4 µs 1 3 Vp p 7 Q202 2 Collector 5 mV DIV 20 µs DIV 36 4 µs 20 mVp p ...

Page 7: ...OWER S101 OFF ON POWER ON D201 DRY BATTERY SIZE AAA IEC DESIGNATION R03 1PC 1 5V MAIN BOARD CONDUCTOR SIDE P1 LINE INPUT RED WHT BLK VOL RV101 1 2 3 4 5 6 A B C D E 1 2 E L ch R ch BLU YEL GRN RED BRN GRN BRN BRN BRN L ch R ch RED HP1 MICROPHONE HEADPHONE Semiconductor Location Ref No Location D201 B 5 IC101 B 3 IC102 B 3 Q2 D 4 Q52 D 4 Q101 D 4 Q201 B 5 Q202 B 4 ...

Page 8: ... 100 6 3V 2 2k 6 8k 0 22 2200p 10k 0 22 18 10k 0 47 0 47 10k 0 22 18 0 22 0 22 10k 2 2k 6 8k 0 22 2200p 0 01 2200p 2200p 10 10V 4 7 0 1 0 1 4 7 10 10V 0 1 0 01 47k 0 0 1 10 10V 0 01 27 2200p 10k 2 2 8 2 220 4V 220 4V 8 2 2 2 0 1 2200p 10k 10k 0 047 4 7k 1k 2 7k 47k 1 2 2k 4 7k 470k 1 0 1 2 2k 1 LA4537M 500 500 1 820 4 7k 1 CL 196HR 10 10V 10 10V L ch R ch 1 2 1 2 POWER ON POWER AMP VIN VOUT S D GN...

Page 9: ...14 3 255 458 01 SCREW DIA 2 TAPPING HP1 A 1086 288 A HEADPHONE ASSY for BLACK HP1 A 1086 705 A HEADPHONE ASSY for BLUE HP1 A 1133 848 A HEADPHONE ASSY for WHITE P1 X 2109 406 1 CORD ASSY PLUG for BLACK BLUE P1 X 2109 407 1 CORD ASSY PLUG for WHITE Items marked are not stocked since they are seldom required for routine service Some delay should be anticipated when ordering these items The mechanica...

Page 10: ...10 25V C201 1 125 837 11 CERAMIC CHIP 1uF 10 6 3V C202 1 162 966 11 CERAMIC CHIP 0 0022uF 10 50V C203 1 162 966 11 CERAMIC CHIP 0 0022uF 10 50V C204 1 107 826 11 CERAMIC CHIP 0 1uF 10 16V LED D201 8 719 077 09 LED CL 196HR CD T POWER ON IC IC101 8 759 835 58 IC LA4537M TE L E IC102 6 707 191 01 IC TK70203CS2G0L SHORT JC101 1 216 864 11 SHORT CHIP 0 TRANSISTOR Q2 8 729 602 21 TRANSISTOR 2SC4154 F Q...

Page 11: ... ADJ CERMET 2 2K RV101 1 227 456 11 RES VAR CARBON 500 500 VOL SWITCH S101 1 771 337 21 SWITCH SLIDE POWER MISCELLANEOUS HP1 A 1086 288 A HEADPHONE ASSY BLACK HP1 A 1086 705 A HEADPHONE ASSY BLUE HP1 A 1133 848 A HEADPHONE ASSY WHITE P1 X 2109 406 1 CORD ASSY PLUG for BLACK BLUE P1 X 2109 407 1 CORD ASSY PLUG for WHITE ACCESSORIES 1 477 125 12 ADAPTOR PLUG DUAL for in flight use 3 046 415 11 PIECE...

Page 12: ...on at the upper right on the revised page allows you to jump to the next revised page Ver Date Description of Revision 1 0 2004 10 New 1 1 2005 08 Addition of US model Revision of electrical parts ENG 05002 1 2 2006 03 Addition of Canadian AEP E models 1 3 2006 11 Addition of EAR PIECE M on ACCESSORIES SPM 06129 ...

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