Sony MDR-NC500D Servise Manual page 10
Noise canceling headphones
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Also See for MDR-NC500D:
- User manual ,
- Product information (88 pages) ,
- Operating instructions manual (27 pages)
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MDR-NC500D
1 AMP Gain Adjustment
Connection:
1. Connect resistors (22 kΩ, 330 Ω + 270 Ω) and capacitor (100 µF) to the TP184, TP478. (Refer to Fig. 2)
2. Connect a resistor to (39 Ω) the TP182, TP183. (Refer to Fig. 2)
3. Connect a resistor to (39 Ω) the TP282, TP283. (Refer to Fig. 2)
– MAIN Board (Side B) –
39 Ω
TP182
level
C
TP282
39 Ω
TP283
D
level
Adjustment:
– L-CH –
1. Connect an audio analyzer (output impedance: 600 Ω) to A and B in Fig. 2.
2. Input the signal (1 kHz, 0 dBv) from the audio analyzer.
3. Adjust RV182 so that C level in Fig. 2 (between TP182 and TP478) is –2.6 dBv ± 0.1 dB. (Refer to Fig. 3)
– R-CH –
4. Remove the one side of resistor (22 kΩ) of the TP184, and connect to TP284. (Refer to Fig. 3)
5. Input the signal (1 kHz, 0 dBv) from the audio analyzer.
6. Adjust RV282 so that the D level in Fig. 2 (between TP238 and TP478) is –2.6 dBv ± 0.1 dB. (Refer to Fig. 3)
10
RV282
adjustment parts
TP183
TP284
R211
RV101
TP203
RV182
RV201
TP184
R111
TP103
TP478
Do not touch in
this adjustment.
15°
0°
–15°
nearby mechanical center
Fig. 3. Adjusted position (reference)
SL201
100 µF
22 kΩ
330 Ω
600 Ω
SL101
270 Ω
measure
and
(R-CH) level
Fig. 2
RV182, RV282
audio analyzer
A
OUT
IN
output impedance: 600 Ω
signal: 1 kHz, 0 dBv
B
(L-CH)
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