Electronical Check By Maintenance Mode - Yamaha disklavier IV / Pro Series Maintenance Handbook

6. Regular field servicing

6 - 5. Electronical check by Maintenance mode

Hammer sensor height adjustment is not necessary on Mark IV models. Calibration compensates certain
sensor height differences instead. Sensor positions are provided by software after the calibration was done
and it will be shown graphically in the ' Piano test ' below. No beep tones sound.
Key sensor height adjustment is necessary only when you replace it ( 4.2mm space between sensor top and the
bottom surface of black keys when they are depressed fully). The measurement is more important than former
models. The 4 sensor points and its end will be provided of software after the calibration.
The following things will be observed when you check the graphical sensor positions of the test.
New depressed
51 Key
key data comes
on top
46 Key
42 Key
1) The bar graph starts from below zero or exceeds end
value.
--> No calibration procedure was done after its
mechanical / positional adjustment.
2) The bar graph does not reach to the end or the bar
moving seems not linearly.
--> Shutter is dirty or broken. You will see
the error message during sensor calibration
full mode.
3) No signal (bar) appears.
--> Check All Connection check.
4) If one of damper or shift signal does not appear,
small sensor board for each pedal might not be connected
to the main pedal board or be damaged. Sostenuto
sensor is a switching one and bar comes full or zero
and it is on the main pedal board. --> See 6-2.
All connection check is not active while the system is working.
CSP board collects new status for each connection when the
system has been turned on from off or standby.
Provided key sensor points
K1, K2, K3, K4,
KS
HS
Provided hammer sensor points
M1, M2,End (End = string position)
M1, M2,End (Quiet mode positions)
MHB23 MKIV/PRO DIOV1.05, SCV.1.01 PAGE.23
End
Damper (R)
Sostenuto
Shift (L)
Provided pedal half
point position