Rear Panel Connections - Tascam 122 Service Manual

I
122
tm)
OUTPUT control
This knob is used to adjust the level ofthe signals
delivered from the OUTPUT jacks on the rear
panel. Both channels are adjusted together. The
readings of the VU meters are not affected by
this control.
4D
Function switches
MONITOR switch
This switch selects the signals fed to the head­
phones (PHONES) jack and the OUTPUT jacks,
and is indicated by the VU meters.
SOURCE: Selects the input connected to the
II N E 1 (rear) or II N E 2 (front) jacks. The levels
displayed by the VU meters depend on the set­
ting of the INPUT controls.
TAPE: Selects the signal from the tape. The
levels displayed by the VU meters are the levels
of the signals recorded on the tape; they are not
affected by the setting of the OUTPUT control.
Note: For tape playback the MON ITO R switch
must be in the TAPE position.
NR SYSTEM switch
DOLBY SYSTEM/NR: Selects the built-in Dolby
Noise Reduction circuit. This position is used to
make a Dolbyized recording or to reproduce a
Dolby-encoded cassette.
DOLBY SYSTEM/N R + HX: Selects the Dolby
Noise Reduction circuit and also the Dolby
Headroom Extension (HX) circuit which gives
greater headroom in recording. Tapes recorded
with the switch in this position can be played
back with the switch in the same position or in
the DO LBY SYSTE M/N R position.
dbx (EXT)/OUT: Use this position to record or
reproduce without noise reduction or when
USING THE OPTIONAL RX-8 DBX NOISE
REDUCTION UNIT.
INPUT switch
This switch selects the signals fed to the record ­
ing circuit for recording.
II N E 1: Selects the signals applied to the rear
panel LINE IN j3cks.
LI N E 2: Selects the signals applied to the front
panel LIN E 2 jacks.
TEST: Use this position when setting the bias
and recording level calibration controls using a
separate signal generator.
SPEED switch
HIGH: Selects a tape speed of
3-3/4
ips.
STANDARD: This selects the normal cassette
tape speed of 1-7/8 ips.
EQ switch
Selec;:ts the equalization characteristics of the
122 to match the type of tape being used.
NORMAL: The equalization is 120 /J.s.
Co (Cr02): The equalization will match cobalt
or chromium dioxide tape.
M ETA L: The equalization will match metal tape.
Note: The EQ switch should be set to match the
tape for both recording and playback.
BIAS switch
Selects the factory-preset bias levels to match
the type of tape being used for recording (with
the BIAS/REC CALIBRATION button in the
PRE -S ET position).
NO RMAL: The bias will match normal low-bias
tape.
Co (Cr02 ): The bias will match cobalt or chrome­
equivalent tape.
METAL: The bias will match metal tape.
Note: The bias has no effect during playback,
by it must be set correctly when recording to get
optimum performance from the tape being used.
4B
VU meters
A PEAK LED is provided in each meter; this
lights to warn of overload at +8 dB input level
which could result in distorted recording.
• TAPE COUNTER
2-2. REAR PANEL CONNECTIONS
OUTPUT (R, L) jacks
LINE 1 (R, L) jacks
DBX UNIT terminals
These eight RCA pin-terminals are used for the
connection of the optional RX-8 dbx noise re ­
duction unit. If the RX-8 is not used, the U-link
plugs provided must be left in place.
DBX UNIT CONTROL SIGNAL socket
This is· a special socket which feeds the control
signal to the optional RX-8 dbx noise reduction
unit.
REMOTE CONTROL Socket .
Allows connection of the optional TEAC RC­
90 Remote Control unit.
5