Sony MDR NC60 - Headphones - Binaural, Руководство по обслуживанию

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9
MDR-NC60
Figure 2
Procedure:
1. Check that the volume position of RV1 (L-CH) and RV101 (R-CH) are mechanical center.
– L-CH –
2. Connect an audio analyzer (impedance: 600
Ω
) to
A
and
C
in figure 2.
3. Connect the audio analyzer to the lead wire of TP2 and the resistor of TP916.
4. Input the signal (60 Hz, +10dBv) from the audio analyzer.
5. Adjust RV2 so that
D
level in figure 2 (between TP2 and TP916) is –21 dBv
±
0.2 dB.
– R-CH –
6. Connect an audio analyzer (impedance: 600
Ω
) to
B
and
C
in figure 2.
7. Connect the audio analyzer to the lead wire of TP102 and the resistor of TP933.
8. Input the signal (60 Hz, +10dBv) from the audio analyzer.
9. Adjust RV102 so that the
E
level in figure 2 (between TP102 and TP933) is –21 dBv
±
0.2 dB.
Figure 3. Adjusted position (reference)
TP3
TP903
TP904
TP905
TP915
TP916
TP913
level
level
TP2
(GND)
(GND)
RV2
RV1
– ML BOARD (SIDE A) –
TP932
TP930
TP933
TP102
TP103
RV101
RV102
– MR BOARD (SIDE A) –
39
Ω
connect lead
wire to TP2
connect lead
wire to TP102
39
Ω
22
Ω
270
Ω
270
Ω
330
Ω
330
Ω
600
Ω
22
Ω
audio analyzer
OUT
IN
impedance: 600
Ω
output: 60 Hz, +10 dBv
A
B
C
D
E
mechanical center
adjustment part
adjustment part
measure
D
(L-CH)
and
E
(R-CH) level
mechanical center
RV2 (L-CH) RV102 (R-CH)