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3. Control Signal Level
[START]
Voltage [V]
Chart-4: Signal Level of START line
[KEY]
Voltage [V]
Chart-5: Signal Level of KEY line
AT-140 Pin Configuration
5
0
More than 350 ms*
Less than 1V to start tuning
*For “Tuner Through” function ;Less than 250 ms
Approximately 5V
5
0
Automatic Tuning Process
Grounded
Approx. 5V
Time
Time
