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Sony MDR-NC11 Service Manual

Noise canceling headphones
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SERVICE MANUAL
Ver 1.1 2004.02
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 battery
box, cord, and battery
Supplied accessories
Earbuds (S × 2, M × 2, L × 2)
Holder (1)
Carrying case (1)
Plug adaptor for in-flight use (single/dual) (1)
Operating Instructions (1)
Design and specifications are subject to change without
notice.
Sony Corporation
9-873-539-02
2004B05-1
Personal Audio Company
C 2004.02
Published by Sony Engineering Corporation
MDR-NC11
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
NOISE CANCELING HEADPHONES
US Model
Canadian Model
AEP Model
E Model
Tourist Model

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  • Page 1 Holder (1) Carrying case (1) Plug adaptor for in-flight use (single/dual) (1) Operating Instructions (1) Design and specifications are subject to change without notice. NOISE CANCELING HEADPHONES Sony Corporation 9-873-539-02 2004B05-1 Personal Audio Company C 2004.02 Published by Sony Engineering Corporation...

  • Page 2: Section 1 General

    Sony battery R03/UM-4 (NU) 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.

  • Page 3: Section 2 Electrical Adjustment

    MDR-NC11 SECTION 2 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 for- ward position.

  • Page 4: Section 3 Diagrams

    MDR-NC11 SECTION 3 DIAGRAMS 3-1. BLOCK DIAGRAM POWER AMP HP1 (2/2) RV101 IC101 (HEADPHONE) (LINE INPUT) POWER (L-ch) R-CH R-CH (R-ch) NOISE CANCEL HP1 (1/2) VOLUME (L) (MICROPHONE) BUFFER AMP (L-ch) S101 POWER (R-ch) R-CH POWER AMP (IC101) B+ REGULATOR...

  • Page 5: Note For Printed Wiring Board And Schematic Diagram

    MDR-NC11 3-2. NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM • Waveforms Note on Printed Wiring Board: Note on Schematic Diagram: 1 IC102 1 (S.D), Q101 (Collector) 5 Q201-2 (Collector), Q202-1 (Collector), Q202-2 (Base) • All capacitors are in µF unless otherwise noted. pF: µµF •...

  • Page 6: Printed Wiring Board

    MDR-NC11 3-3. PRINTED WIRING BOARD DRY BATTERY SIZE "AAA" MAIN BOARD (COMPONENT SIDE) (IEC DESIGNATION R03) 1PC. 1.5V S101 POWER IC101 − 1 − 2 D201 POWER ON JC101 IC102 • Semiconductor 1B 2C Location Ref. No. Location 1C 1C...

  • Page 7: Schematic Diagram

    MDR-NC11 3-4. SCHEMATIC DIAGRAM • See page 5 for Waveforms. TP103 DRY BATTERY C111 SIZE"AAA" (IEC DESIGNATION R03) 2.7k 1PC. 1.5V VOUT (1/2) 0.047 (MICROPHONE) REGULATOR IC102 4.7k TK70203M Q101 C114 C112 2SC4154TP DTA123YUA 0.01 BUFFER AMP 1000p SWITCHING (L-ch) C201 2.2k...

  • Page 8: Section 4 Exploded View

    MDR-NC11 Ver 1.1 SECTION 4 EXPLODED VIEW NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they are seldom required for routine service. Some may have some difference from the original delay should be anticipated when ordering one.

  • Page 9: Section 5 Electrical Parts List

    SECTION 5 ELECTRICAL PARTS LIST MAIN NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark parts list may be different from the parts speci- are seldom required for routine service.

  • Page 10: Manual, Instruction

    MDR-NC11 Ver 1.1 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-216-841-11 METAL CHIP 1/16W 1-216-825-11 METAL CHIP 2.2K 1/16W 1-216-800-11 RES-CHIP 1/10W 1-218-867-11 RES-CHIP 6.8K 1/10W 1-216-825-11 METAL CHIP 2.2K 1/16W 1-216-833-11 METAL CHIP...

  • Page 11: Revision History

    MDR-NC11 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 2002.02...

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