Key Sensor Measurement & Sensor Height Adjustment - Yamaha AvantGard N3 Maintenance Handbook

N3, N2, N1, NU1
KEY SENSOR MEASUREMENT & SENSOR HEIGHT ADJUSTMENT
The following cases require N3, N2, N1, and NU1 keyboard and action adjustment.
1. When playing performance is not satisfactory due to lack of evenness of action/keyboards movement and control.
2. When a problem was found in generation of electronic sounds and required to be checked along with other problems.
3. When the keyboard or key action has been damaged.
Always perform key sensor measurement after making these repairs and adjustments.
KEYBOARD RELATED PROBLEM REPAIR FLOW: HYBRID PIANOS
Or is keyboard action mechanism
Replace parts, adjust keyboard & action,
adjust sensor height
Make the key sensor measurements
Sensor system overview
The AvantGrand N3, N2, N1 detect keyboard play information via key sensors and hammer sensor, and on the NU1 only via key
sensors. Pedal play information is detected in all cases by pedal sensors. Keyboard movement data detected by each sensor is converted
into keyboard speed (volume) & sounding timing data & muting timing data on the sensor circuit board and then sent to the DM circuit
board as an electronic sound source to produce music sounds.
Sensor unit overview and adjustment methods
Though constant height adjustments are not normally required, if the sensor unit was replaced or if the sensor and keyboard positions
have drastically changed due to key or keyboard adjustments then the sensor unit height must be checked and adjusted.
Defi nition of term
· REST : Position when the keyboard is not pressed.
· END : Position when the keyboard is lightly pressed to the bottom of the key.
· K1/K2/K3/K4 : Four threshold values between the REST position and END position when a key is pressed. While the value
· M1/M2 : Two threshold values between the REST position and END position when a hammer is in motion. The
6
Problem occurs
Is part damaged?
defective?
YES
of the END is 10 mm, the threshold values are K1 = 2.7 mm, K2 = 4.5 mm, K3 = 6.3 mm and K4 = 8.1 mm.
distance between the M1 and M2 is 10 mm while that between the M2 and END is 1 mm.
NO
Make the key sensor measurements
NO
Repair is complete
Is problem eliminated
or improved?
YES