Operating instructions

4.2.3 Playback of Initial Tracks
1. Rewind the tape to the beginning of the recording by pressing SEARCH
ZERO on the Auto Locator (if the Tape Timer was reset at the beginning
of the recording session) or by pressing the REWIND button.
2. Set the ALL SAFE switch on the Remote Control Unit to the ALL SAFE
position to avoid accidentally erasing recorded tracks. The ALL SAFE
indicator will become illuminated.
3. Set the Output Selector switches for the recorded tracks to the REPRO
position or press the ALL REPRO button. The REPRO indicator for the
tracks being reproduced will become illuminated.
4. Press the PLAY button. The signal on the tape will be reproduced by the
Reproduce head and fed to the Output connectors.
5. Adjust the monitor level at the mixing console.
4.2.4 Sel·Rep Recording (Overdubbing)
Overdubs are performed when it is necessary to add additional tracks
synchronized with material already recorded on other tracks. During Sel·Rep
(Selective Reproduction) playback the recorded material is reproduced by the
record head making it possible to add (overdub) tracks without delay caused
by the space between the Record and Reproduce heads (as in normal
playback). When overdubs are recorded, the recorded tracks are played in
Sel·Rep and monitored through the mixing console. The new material is then
recorded in synchronization with the existing tracks.
A variation of this technique involves an insert, or punch-in, of new material
to replace or add to a previously recorded track. This method is discussed in
§ 4.2.5 Sel·Rep Recording (Punch-Ins).
NOTE: For rehearsal of an overdub, see § 4.2.6.
1. Press the ALL SEL·REP button on the Remote Control Unit.
2. Move the ALL SAFE switch to its OFF position (adjacent red indicator
off).
3. For the channels to which new material is to be added, set the
READY/SAFE switches to the READY position (red indicator above
flashes). For the other channels (channels not to be recorded), set the
READY/SAFE switches to the SAFE position (red indicator above off).
NOTE: When the tape is stopped, the input of any tracks set to Ready mode
will be monitored unless SW1-2 on the TRANSPORT CONTROL PCB
Assembly is off (see § 2.1 Step 2).
4. Press the PLAY and RECORD buttons to begin recording. The input
signal from the channels being recorded and the signal from the tape
from the record head and sync amp on those tracks not being recorded
will be monitored.
5. To end the recording, press the STOP button. As a further precaution,
engage the ALL SAFE switch to prevent accidental erasure of those
channels set to Ready mode.
MTR-90III Operation and Maintenance Manual
October 1990
Section 4 Operation
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