4
MDR-NC11A
SECTION 3
ELECTRICAL ADJUSTMENT
NOISE CANCEL VOLUME ADJUSTMENT
Connection:
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.
2. Mount this headphones on the ear, and turn on the
[POWER]
switch.
3. With this headphones mounted, adjust the RV1 (L-ch) and
RV51 (R-ch) so that the volume from the speaker becomes
lowest aurally.
Note:
When the headphones are not covered with the ear pieces completely, the
adjustment may not be performed correctly.
Make sure that the ear pieces cover the headphone completely.
Adjustment Location:
– MAIN BOARD (Component Side) –
+
–
amplifier
speaker
AF oscillator
NOISE CANCEL
RV51 (R-ch)
VOLUME ADJUSTMENT
RV1 (L-ch)
S101
[POWER]
OFF
t
ON