Yamaha DISKLAVIER MX1Z Service Manual page 11

13. HAMMER EMISSION Circuit Board,
HAMMER SENSOR Circuit Board
13-1 Open the top board. (Fig. 1)
13-2 Remove the upper front board. (See Procedure A-1.)
13-3 Remove the keyboard cover. (See Procedure A-2.)
13-4 Remove the key stop rail. (See Procedure A-3.)
13-5 Remove the action unit. (See Procedure A-5.)
13-6 Remove the hammer sensor unit. (See Procedure B-12.)
13-7 Remove the three (3) screws marked [E] and the fiber
cover. The HAMMER SENSOR circuit board can then be
removed. (Fig. 6)
13-8 Remove the two (2) screws marked [14G] and the fiber
cover. The HAMMER EMISSION circuit board can then
be removed. (Fig. 6)
14. Key Sensor Unit
14-1 Open the top board. (Fig. 1)
14-2 Remove the upper front board. (See Procedure A-1.)
14-3 Remove the keyboard cover. (See Procedure A-2.)
14-4 Remove the key stop rail. (See Procedure A-3.)
14-5 Remove the action unit. (See Procedure A-5.)
14-6 Remove the keyboard.
14-7 Remove the eight (8) screws marked [48S]. The key
sensor unit can then be removed. (Fig. 7)
15. KEY SENSOR Circuit Board,
KEY EMISSION Circuit Board
15-1 Open the top board. (Fig. 1)
15-2 Remove the upper front board. (See Procedure A-1.)
15-3 Remove the keyboard cover. (See Procedure A-2.)
15-4 Remove the key stop rail. (See Procedure A-3.)
15-5 Remove the action unit. (See Procedure A-5.)
15-6 Remove the key sensor unit. (See Procedure B-14.)
15-7 Remove the two (2) screws marked [29G]. The KEY
SENSOR circuit board can then be removed. (Fig. 8)
15-8 Remove the two (2) screws marked [26G] and the screw
marked [30G]. The KEY EMISSION circuit board can
then be removed. (Fig. 8)
Hammer sensor unit
[E]x3
Hammer sensor unit
[14G]: Pan Head Tapping Screw-P 3.0x6 MFZN2BL (EP630180)
Key sensor unit
[48S]: Truss Head Tapping Screw-1 4.0x12 MFZN2BL (03747270)
KEY EMISSION
[30G]
[26G]: Flat Head Tapping Screw-P 3.0x10 MFZN2BL (VL280200)
[29G]: Pan Head Tapping Screw-P 3.0x20 MFZN2BL (VZ630500)
[30G]: Pan Head Tapping Screw-S 3.0x5 MFZN2BL (VH838200)
HAMMER SENSOR
HAMMER EMISSION
[14G]x2
(Fig. 6)
[48S]
(Fig. 7)
KEY SENSOR
[29G]
Key sensor unit
[26G]
(Fig. 8)
MX1Z
11