Yamaha b2-Silent Manuel de maintenance - Page 6
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Test Mode
This series features a test program that verifies key sensor and pedal sensor point of detection of
performance information.
The test mode is useful for checking the point of detection and assessing the cause for problems
described below.
⋅ Sound produced by the tone generator is uneven, or the volume changes improperly, etc.
⋅ Pedal effects operate abnormally.
Etc.
Starting the Test Mode
Switch the power OFF. Connect a pair of headphones.
Hold down the 1A, 3B, and 4C white keys and switch the power
ON keeping the keys held down for about 2 seconds before releasing.
The test mode will not start if the keys are held for a shorter or longer amount of time.
Key Sensor
Slowly depress a white key and make sure that the point at which the buzzer sounds is at the following
key positions.
K1
Buzzer sound 1
K2
Buzzer sound 2
K3
Buzzer sound 3
K4
Buzzer sound 4
Pedal Sensor
Damper
With the pedal not pressed..........................................The buzzer sound is not produced.
Pedal slightly depressed..............................................Buzzer(*1) sounds continuously.
Pedal depressed to the half-way point ........................Buzzer(*2) sounds intermittently.
Pedal depressed further (close to the stroke end).......Buzzer(*3) sound is quick and intermittent.
The (*2) buzzer sounds when the damper around key 49 moves slightly away from the string
(1+/-0.5mm).
Soft
With the pedal not pressed........The buzzer is not produced.
With the pedal depressed..........Buzzer sounds when the hammer rail is at 2 or 3mm from the
Use the sensor adjustment screw to adjust the point at
which the soft pedal sensor activates the buzzer.
SW Box Self-Test
⋅ Connect a pair of headphones, then switch on the power.
⋅ Push the self-test switch located on the backside of the switch
box, to start the SW Box self-test.
1 SW Box and Sensor Unit Communications Test
⋅ When the test starts, the two units automatically commu-
nicate with each other.
C Major chord plays if communication is successful.
C minor chord plays if communication is unsuccessful.
⋅ The "Black Key" Etude plays continuously while the test is in progress.
2 AD Test
⋅ Detects reverb knob rotation and damper pedal depth, then produces a chromatic scale.
⋅ During Self-Test,
⋅ Rotating the reverb knob clockwise produces a chromatic scale from low to high (counter
clockwise rotation produces a chromatic scale from high to low).
⋅ Pressing the damper pedal produces a chromatic scale from low to high (releasing the
pedal produces the scale from high to low).
about 2.7mm of key depth
about 4.5mm of key depth
Buzzer sounds 3 and 4 should be produced until the stroke end of key
depth
start position.
6
SW Box Self-Test Switch
Rear
PDL
KEY
DC IN 12V