Technics ST 9600 Service Manual

Page 2

1 LOCATION OF CONTROLS

Q) FM STEREO INDICATOR @IaAND SELECTOR/PINK NOISE ®SoonI=M ANTENNA TERMINALS

® FM TUNING METER CHECK SWITCH @750FM ANTENNA TERMINALS

@ FM/AM SIGNAL STRENGTH METER @TUNING CONTROL @AM ANTENNA TERMINAL

(4) POWER SWITCH MAM ANTENNA COIL @AI: ou-rpu-r TERMINALS

(5) AF OUTPUT LEVEL CONTROL ® RECORDING OUTPUT TERMINALS ® LINE OUTPUT TERMINALS (T0 PLAYBACK

@ MPX HI

CD FM MUTING & SERVO TUNING ® PLAYBACK INPUT TERMINALS ITO @LINE INPUT TERMINALS (TO RECORDING
SWITCH OUTPUT TERMINALS OF TAPE DECK) OUTPUT TERMINALS OF AMPLIFIERI

@TAPE DECK RECORDING/FLAy_ ®ACH MPX OUTPUT TERMINAL @FM MULTIPATH OUTPUT TERMINALS
BACK SWITCH ® 7SDCOAXIAL FM ANTENNA SOCKET @VOLTAGE SELECTOR SWITCH

(Except Set for Australia)

T iFM IF AMPLIFIER LC.

FM DISCRIMINATOR
CIRCUIT FM RF CIRCUIT

p; TUNING GANG

AM CIRCUIT

) iiirDlSCRlMlNATOR
AMPLIFIER |,C.

PINK NOISE CIRCUIT

FM MUTING CIRCUIT
MUTING RELAYi
POWER FUSES

AF AMPLIFIER |.C.

LOW PASS FILTER

AUTO HI»BLEND

CIRCUIT FM MPX I C.

I LOW-NOISE RECORDING AND PLAYBACK

When making an ordinary recording of an FM broadcast, the tuner output is transmitted to the amplifier, and the
Signal taken from the recording terminals of the amplifier is recorded and played back. When this method is used,
any noise which is generated within the tuner, as well as FM noise, is recorded also. Then, during playback, the
.sound also includes the tape-noise component.

This unit, in order to reduce this noise component, includes special recording and playback circuitry. And, in
addition, the Operation of one switch also makes it possible to record and playback in the usual way if desired.

What path the FM signal will follow to the tape deck for recording, playback and monitoring, depending Upon the
setting of the recording/playback switch of this unit, is shown on the following page.

The frequency response Of the FM signal which has been subjected to PM MPX is a high level, high-frequency signal.
FM none is included in this signal, and tape noise will also be included in a signal which has passed through the tape
deck. Generally, because the higher the frequency, the higher the noise, the signal is recorded as it is after FM MPX,
and, by subjecting the playback signal to deemphasis, the FM signal will assume a flat response and the noise level
can, at the same time, be reduced. A

(Tape noise can be reduced by approximately 10 dB/lO kHz lower than when recording in the usual way.)

E ST-9600