Pioneer A-7 서비스 매뉴얼 - 페이지 5

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42 SPEAKERS A/B INDICATORS

These light when one of the SPEAKERS switches has been

depressed.

(3) MODE INDICATOR

BALANCE

INDICATOR

(3 LINE STRAIGHT INDICATOR

This lights when the LINE STRAIGHT-OFF switch has been

released to ON in place of the BALANCE, MODE and TONE

indicators.

TONE INDICATOR

This lights when

the tone control circuitry has been ac-

tuated,

(2 LOUDNESS

INDICATOR

This lights when the LOUDNESS siwtch has been set to ON.

SUBSONIC

FILTER INDICATOR

This lights when the SUBSONIC FILTER switch has been set

to ON.

(3 BALANCE CONTROL

This is used to adjust the balance of the sound from the left

and right channels. When rotated clockwise from its center

position, the volume of the left (L) channel is reduced; when

rotated counterclockwise, the volume of the right (R) chan-

nel is reduced.

To adjust the balance, first set the BALANCE control to its

center position, set the MODE selector to MONO and rotate

the control so that the sound seems to be coming from the

midpoint between the left and right speakers.

@0) SPEAKERS SWITCHES

These are used to select the speakers through which you will

listen to the sound. When one of the switches is depressed,

the corresponding speaker indicator will light to indicate that

the selected speakers are now working.

The sound is heard from the speakers connected to

the speaker A terminals.

The sound is heard from the speakers connected to

the speaker B terminals.

No sound will be heard when SPEAKERS A and B switches

are both released. This is the position at which the sound can

be heard through the headphones.

@) SUBSONIC FILTER SWITCH

The subsonic filter with the 15 Hz cutoff frequency is ac-

tuated when this switch is depressed to the ON position (the

SUBSONIC

FILTER indicator lights).

This filter serves to attenuate frequencies lower than,

20 Hz

with a 6 dB/oct slope and, therefore, it can be used to sup-

press the ultra-low-range noise which is generated by record

warp and other factors. This noise cannot actually be heard

by the ear but it can cause cross modulation distortion and

even speaker damage. Use this switch when required during

record play.

Q2) LOUDNESS SWITCH

The bass and treble sound is emphasized when this switch is

depressed to the ON position (LOUDNESS

indicator lights)

under low volume listening conditions.

When the volume of sound is low, the capability of the ear to

pick up the bass and treble sound drops off, compared with

high volume listening conditions.

The LOUDNESS

switch

compensates for this characteristic of the ear. The bass and

treble are emphasized when the switch is set to ON and the

sound comes alive even when the volume is low.

@) REC OUT 1, 2 INDICATORS

These indicate the tape deck which is recording in accor-

dance with the position selected by the REC OUT SELEC-

TOR switch.

@) PROTECTION-RED INDICATOR

This lights in red or green, depending on the operating mode

of the power protection circuit.

@5) REC SELECTOR INDICATOR

@6) MUTING INDICATOR

This lights in accordance with the position of the MUTING

switch.

FUNCTION

INDICATORS