Sony MDR-NC11A Service Manual
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Sony MDR-NC11A Service Manual

Sony MDR-NC11A Service Manual

Noise canceling headphones
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SERVICE MANUAL
Ver. 1.3 2006.11
SPECIFICATIONS
General
Type
dynamic, closed
Driver units
9 mm dia
Power handling capacity
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
DC 1.5 V, 1 × R03 (size AAA) battery
Power source
Mass
Approx. 47 g (1.7 oz) including batterybox, cord, and battery
Supplied accessories
Sony R03 (size AAA) battery (1)
Earbuds (S × 2, M × 2, L × 2)
Holder (1)
Carrying case (1)
Plug adaptor for in-flight use* (single/dual) (1)
Operating Instructions (1)
* May not be compatible with some in-flight music services.
Design and specifications are subject to change without notice.
Sony Corporation
9-879-188-04
Personal Audio Division
2006K05-1
Published by Sony Techno Create Corporation
© 2006.11
MDR-NC11A
Note on chip component replacement
• Never reuse a disconnected chip componet
• Notice that the minus side of a teamtalum capacitor may be damaged by
heat
NOISE CANCELING HEADPHONES
US Model
Canadian Model
AEP Model
E Model
Tourist Model

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  • Page 1 Power source Mass Approx. 47 g (1.7 oz) including batterybox, cord, and battery Supplied accessories Sony R03 (size AAA) battery (1) Earbuds (S × 2, M × 2, L × 2) Holder (1) Carrying case (1) Plug adaptor for in-flight use* (single/dual) (1) Operating Instructions (1) * May not be compatible with some in-flight music services.

  • Page 2: Section 1 Servicing Note

    MDR-NC11A SECTION 1 SERVICING NOTE WIRING DIAGRAM brown blue yellow green white black main board (conductor side)

  • Page 3: Section 2 General

    20 hours Corporation. be distorted. • Be sure to bring the headphones to the Sony dealer when When to replace the battery Notes on using on the airplane requiring a change of earbuds or repair work. Replace the battery with a new one when the POWER •...

  • Page 4: Section 3 Electrical Adjustment

    MDR-NC11A SECTION 3 ELECTRICAL ADJUSTMENT NOISE CANCEL VOLUME ADJUSTMENT Connection: speaker AF oscillator amplifier – Procedure: 1. Generate a sine wave of specific frequency (250 Hz) from a AF oscillator, and output it from a speaker placed at the forward position.
  • Page 5 MDR-NC11A SECTION 4 DIAGRAMS • Note for Printed Wiring Board and Schematic Diagram Note on Printed Wiring Board: Note on Schematic Diagram: • X : parts extracted from the component side. • All capacitors are in µF unless otherwise noted. (p: pF) •...
  • Page 6 MDR-NC11A • Waveforms IC102 1 (S.D), Q202-2 (Collector) Q101 (Collector) 20 mVp-p 20 mVp-p 36.4 µ s 36.4 µ s 5 mV/DIV, 20 µ s/DIV 5 mV/DIV, 20 µ s/DIV Q201-1 (Base) 1.1 Vp-p 36.4 µ s 200 mV/DIV, 20 µ s/DIV...

  • Page 7: Main Board

    MDR-NC11A 4-1. PRINTED WIRING BOARD • Semiconductor Location Ref. No. Location D201 DRY BATTERY IC101 SIZE "AAA" MAIN BOARD (COMPONENT SIDE) (IEC DESIGNATION R03) IC102 1PC. 1.5V S101 Q101 POWER Q201 Q202 IC101 − 1 − 2 D201 POWER ON...
  • Page 8 MDR-NC11A Ver. 1.1 • See page 6 for Waveforms 4-2. SCHEMATIC DIAGRAM BOARD TP103 DRY BATTERY C111 SIZE"AAA" (IEC DESIGNATION R03) 2.7k 1PC. 1.5V VOUT (1/2) 0.047 (MICROPHONE) REGULATOR IC102 4.7k TK70203CS2G0L Q101 C114 C112 2SC4154TP DTA123YUA 0.01 BUFFER AMP...

  • Page 9: Exploded Views

    MDR-NC11A Ver. 1.2 SECTION 5 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they • Color variation may have some difference from the original are seldom required for routine service. Some BLACK : US, Canadian, AEP, E, Tourist one.

  • Page 10: Section 6 Electrical Parts List

    MDR-NC11A Ver. 1.1 SECTION 6 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they When indicating parts by reference parts list may be different from the parts are seldom required for routine service.

  • Page 11: Manual, Instruction

    MDR-NC11A Ver. 1.3 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-216-841-11 METAL CHIP 1/10W 1-216-825-11 METAL CHIP 2.2K 1/10W 1-216-800-11 METAL CHIP 1/10W 1-218-867-11 METAL CHIP 6.8K 0.5% 1/10W 1-216-825-11 METAL CHIP 2.2K 1/10W...

  • Page 12: Revision History

    MDR-NC11A REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2004.10...

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