Yamaha Tyros4, Service Manual

Page: 19 / 173

19
Tyros4
[S03J]
CN2
LCD UPPER CASE
LCL
LCR
[S03K]
CN2 CN2
Fig. 16
D
[S03L]
D
LCD UPPER CASE CRYSTAL DISPLAY
Fig. 17
22. LCL Circuit Board
(Time Required: About 7 minutes)
22-1 Separate the upper case unit and lower case unit.
(See procedure 1.)
22-2 Remove the LCD unit. (See procedure 20.)
22-3 Remove the LCD lower case assembly and gear.
(See procedure 21.)
22-4 Lift the stopper of the CN2 connector as shown in Fig. 16
and then remove the
fl at cable and ferrite core. (Fig. 16)
22-5 Remove the five (5) screws marked [S03J]. The LCL
circuit board can then be removed. (Fig. 16)
23. LCR Circuit Board
(Time Required: About 7 minutes)
23-1 Separate the upper case unit and lower case unit.
(See procedure 1.)
23-2 Remove the LCD unit. (See procedure 20.)
23-3 Remove the LCD lower case assembly and gear.
(See procedure 21.)
23-4 Remove the four (4) screws marked [S03K]. The LCR
circuit board can then be removed. (Fig. 16)
24. Crystal Display
(Time Required: About 7 minutes)
24-1 Separate the upper case unit and lower case unit.
(See procedure 1.)
24-2 Remove the LCD unit. (See procedure 20.)
24-3 Remove the LCD lower case assembly and gear.
(See procedure 21.)
24-4 Lift the stopper of the connector at the portion [D] as
shown in Fig. 17 and then remove the flat cable and
ferrite core. (Fig. 17)
24-5 Remove the four (4) screws marked [S03L]. The crystal
display can then be removed. (Fig. 17)
When connecting to the connector, pay attention
not to insert the cable inversely.
25. Keyboard Assembly
(Time Required: About 9 minutes)
25-1 Separate the upper case unit and lower case unit.
(See procedure 1.)
* Be sure to remove the DM cover.
25-2 Remove the eight (8) screws marked [S14B] and five
(5) screws marked [S05R]. The MK unit can then be
removed. (Fig. 18)
* Be sure to loosen the cord holder marked [18] and
release the flat cable (PC sensor) from the cord
holder before lifting the keyboard. (Fig.18)
If the keyboard is lifted without releasing the flat
cable from the cord holder, the flat cable or the
sensor may be damaged.