Operating instructions

4.2.9 Spot Erasure
The Spot Erase function is available for erasing short lengths of unwanted
tracks.
1. Search for the portion of tape to be erased in Cue mode or by rotating
the top of the capstan motor by hand.
2. Mark the beginning and the end of the portion of the tape to be erased
with a grease pen.
3. Press the STOP button.
4. Set the READY/SAFE switch to the READY position for the channel to be
erased. Set all other channels to SAFE.
5. Press the SPOT ERASE button. (The SPOT ERASE and STOP lamps will
blink.)
6. Move the tape slowly by rotating the top of the capstan motor by hand.
7. Press the CUE button just before the beginning of the portion to be
erased reaches the erase head. (Keep pressing both the SPOT ERASE
and CUE buttons. Both lamps will illuminate.)
8. Keep the tape moving until the end of the portion to be erased comes in
front of the erase head, then release the buttons. (Continue moving the
tape slowly for an instant.)
9. The erase current slowly diminishes thus leaving no noise on the tape.
4.2.10 Variable Speed Mode
By setting the Speed Mode Selector on the CB-147 Remote Control to VARI,
the Record/Playback tape speed can be adjusted from the selected speed
over a range of approximately ±20% (approx. ±2 tones). The actual tape
speed can be calculated by multiplying the selected tape speed by the
percentage of variation indicated on the PITCH CONTROL digital readout and
adding or subtracting that value from the base speed; or it can be read
directly from the Speed Display screen when the SPEED DISPLAY switch is
set to the IPS position (press the SPEED DISPLAY button to turn on the
Speed Display screen). Variable speed can used to "tune up" new or old
tracks during overdubs, to change tempos, to bring a song into vocalist's
range, to squeeze or stretch a program to fit a particular time slot, etc.
1. Set the Speed Mode Selector switch on the Remote Control unit to the
VARI position.
2. Use the PITCH CONTROL on the Remote Control unit to vary the capstan
speed as desired. Turning the PITCH CONTROL counter-clockwise
causes the speed to decrease, turning it clockwise causes the speed to
increase.
3. To exit Vari mode, set the Speed Mode Selector switch to the FIX
position.
MTR-90III Operation and Maintenance Manual
October 1990
Section 4 Operation
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