Section 2 Electrical Adjustment; Main Board (Component Side) - Sony MDR-NC11 Service Manual

Noise canceling headphones

Hide thumbs Also See for MDR-NC11:

Table of Contents

NOISE CANCEL VOLUME ADJUSTMENT

Connection:

AF oscillator

–

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.

2. Mount this set on the head, and turn on the

3. With this set mounted, adjust the RV1 (L-ch) and RV51 (R-

ch) so that the volume from the speaker becomes lowest au-

rally.

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) –

NOISE CANCEL

RV51 (R-ch)

VOLUME ADJUSTMENT

RV1 (L-ch)

SECTION 2

ELECTRICAL ADJUSTMENT

speaker

amplifier

[POWER]

switch.

S101

[POWER]

OFF t ON

MDR-NC11

Table of Contents