Sony MDR-NC22 Service Manual
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Sony MDR-NC22 Service Manual

Sony MDR-NC22 Service Manual

Noise canceling headphones
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SERVICE MANUAL
Ver. 1.2 2007.02
SPECIFICATIONS
General
Type
dynamic, closed
Driver units
13.5 mm, dome type (CCAW adopted)
Power handling capacity
50 mW
20 Ω at 1 kHz
Impedance
(when the power is on)
8.5 Ω at 1 kHz
(when the power is off)
Sensitivity
102 dB/mW (when the power is on)
100 dB/mW (when the power is off)
Frequency response
8 – 22,000 Hz
Frequency range of active noise attenuation
50 – 1,500 Hz more than 12 dB at
200 Hz
Cord
1.5 m (59
neck-chain (including battery box)
Plug
Gold-plated L type stereo mini plug
DC 1.5 V, 1 × R03 (size AAA) battery
Power source
Mass
Approx. 39 g (1.4 oz) including battery
box, cord, and battery
Supplied accessories
Sony R03 (size AAA) battery (1) (US, Tourist models)
Earbuds (S × 2, M × 2, L × 2)
Carrying pouch (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
9-887-426-03
Personal Audio Division
2007B05-1
Published by Sony Techno Create Corporation
© 2007.02
1
/
in) OFC litz cord,
8
MDR-NC22
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
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
NOTES ON REPLACEMENT OF CSP (CHIP SIZE
PACKAGE) IC
Replacement of IC2 used in this set requires a special tool.
NOISE CANCELING HEADPHONES
US Model
Canadian Model
AEP Model
E Model
Tourist Model

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  • Page 1 Caution: The printed pattern (copper foil) may peel away if Supplied accessories the heated tip is applied for too long, so be careful! Sony R03 (size AAA) battery (1) (US, Tourist models) • Strong viscosity Earbuds (S × 2, M × 2, L × 2)

  • Page 2: Section 1 General

    Battery Approx. hours* The power indicator lights in red. The power switch is located on the battery box. When Sony alkaline battery LR03/AM- 50 hours* • Noise canceling headphones reduce ambient noise, and 4 (N) power is turned on, ambient noise is reduced,...

  • Page 3: Section 2 Disassembly

    MDR-NC22 SECTION 2 DISASSEMBLY • This set can be disassembled in the order shown below. 2-1. DISASSEMBLY FLOW 2-2. CABINET FRONT ASSY (Page 3) 2-3. LIGHT GUIDE PLATE (Page 4) 2-4. HEADPHONE ASSY, CORD (WITH PLUG) (LINE INPUT) (P1) (Page 4) 2-5.
  • Page 4 MDR-NC22 2-3. LIGHT GUIDE PLATE 2 light guide plate headphone assy MAIN board 1 Remove the headphone assy, MAIN board and cord (with plug) (line input) (P1) in the direction of the arrow. cord (with plug) (line input) (P1) 2-4. HEADPHONE ASSY, CORD (WITH PLUG) (LINE INPUT) (P1)

  • Page 5: Main Board

    MDR-NC22 2-5. MAIN BOARD 2 terminal battery (–) 1 Remove two solders of terminal battery (–). 5 MAIN board 4 terminal battery (+) 3 Remove solder of terminal battery (+).

  • Page 6: Section 3 Electrical Adjustment

    MDR-NC22 SECTION 3 ELECTRICAL ADJUSTMENT NOISE CANCEL VOLUME ADJUSTMENT Connection: speaker AF oscillator amplifier – Procedure: 1. Generate a sine wave of specific frequency (200 Hz) from a AF oscillator, and output it from a speaker placed at the forward position.

  • Page 7: Section 4 Diagrams

    MDR-NC22 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 8 MDR-NC22 • Waveforms • IC Block Diagrams IC2 LM4916LDX/NOPB Q201 (Base-1) IN A 1 – OUT A SE/BTL 860 mVp-p CLICK-POP & SD 2 37.5 µ s MODE CONTROL MUTE 3 LOGIC 500 mV/DIV, 20 µ s/DIV BIAS BYPASS 4...
  • Page 9 MDR-NC22 4-1. PRINTED WIRING BOARD • Semiconductor Location Ref. No. Location MIC1 (L-CH) MAIN BOARD (SIDE A) MIC51 D101 (R-CH) D201 L101 D101 RV51 (L-CH) C102 IC101 MONITOR C107 SP51 IC102 (R-CH) S301 S101 Q101 POWER Q102 Q102 OFF t ON...
  • Page 10 MDR-NC22 • See page 6 for Waveforms. • See page 6 for IC Block Diagrams. 4-2. SCHEMATIC DIAGRAM BOARD Q103 Q201,202 DTA123JE LED DRIVE D101 L101 POWER ON DETECT Q201 R201 RB161M-20TR 47µH UMA4N-TR Q101 2SB1689 R103 DC/DC CONVERTER P101...

  • Page 11: Exploded Views

    MDR-NC22 SECTION 5 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they may have some difference from the original are seldom required for routine service. Some one. delay should be anticipated when ordering •...
  • Page 12 MDR-NC22 5-2. CABINET CENTER SECTION Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 2-695-979-02 CABINET, BATTERY (BLACK) 2-695-985-01 TERMINAL BATTERY (+) 2-695-979-12 CABINET, BATTERY (WHITE) A-1215-440-A MAIN BOARD, COMPLETE 2-695-979-22 CABINET, BATTERY (PINK) 4-220-438-21 PIECE (M), EAR (M size) (for BLACK)

  • Page 13: Electrical Parts List

    MDR-NC22 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 14 MDR-NC22 Ver. 1.2 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-240-714-91 METAL CHIP 1/20W < VARIABLE RESISTOR > 1-240-707-91 METAL CHIP 1/20W 1-227-413-21 RES, ADJ, CERMET 100K 1-240-707-91 METAL CHIP 1/20W RV51 1-227-413-21 RES, ADJ, CERMET...
  • Page 15 MDR-NC22 MEMO...

  • Page 16: Revision History

    MDR-NC22 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 2006.10...

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