Teac TD-240A - Digital Zero Function; Setting Digital Zero

7.DIGITAL ZERO FUNCTION
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7. DIGITAL ZERO FUNCTION
This function makes the indicated value zero instantly by a key operation.
1) Perform digital zero.
2) When the indicated value becomes zero, digital zero is completed.
ZERO
Setting of Digital Zero
Digital zero will not work when the calibration value LOCK is
turned off.
It only works when the calibration value LOCK is turned on.
If you turn off the power, digital zero will be reset.