DU1A
17
Key sensor unit
[041S]
15.
HAMMER SENSOR Circuit Board and HAMMER EMISSION
Circuit Board
(Time required: About 15 minutes each)
15-1
Open the top board (front). (See procedure A-1.)
15-2
Remove the upper board (front). (See procedure A-2.)
15-3
Remove the fallboard. (See procedure A-3.)
15-4
Remove the keyboard holder. (See procedure A-4.)
15-5
Remove the action unit. (See procedure A-6.)
15-6
HAMMER SENSOR Circuit Board:
Remove the two (2) screws marked [81G]. The HAMMER
SENSOR circuit board can then be removed.
(Fig.4, Photo.5)
15-7
HAMMER EMISSION Circuit Board:
Remove the two (2) screws marked [91G]. The HAMMER
EMISSION circuit board can then be removed. (Fig.4)
∗
The HAMMER SENSOR and HAMMER EMISSION
circuit boards may be removed without removing the
hammer sensor unit.
[91G]
[81G]
Hammer sensor unit
HAMMER SENSOR
HAMMER EMISSION
Front view
(Fig.4)
[81G]: Flat Head Tapping Screw-P 3.0X10 MFZN2BL (VL280200)
[91G]: Pan Head Tapping Screw-P 3.0X20 MFZN2BL (VZ630500)
16.
Key Sensor Unit
(Time required: About 27 minutes)
16-1
Open the top board (front). (See procedure A-1.)
16-2
Remove the upper board (front). (See procedure A-2.)
16-3
Remove the fallboard. (See procedure A-3.)
16-4
Remove the keyboard holder. (See procedure A-4.)
16-5
Remove the complete keyboard.
16-6
Remove the eight (8) screws marked [041S]. The key
sensor unit can then be removed. (Fig.5)
∗
When removing the keyboard, take care not to damage
the key shutter on each key. (Photo.6,7)
Key
(Photo.6)
Key shutter (V8891900)
(Photo.7)
(Fig.5)
[041S]: Truss Head Tapping Screw-1 4.0X20 MFZN2BL (03747290)
Front view
(Photo.5)
[81G]
Hammer
HAMMER SENSOR
