Yamaha KB-180 Service Manual page 11

8. PNR Circuit Board
(Time required: About 6 minutes)
8-1 Remove the lower case assembly. (See procedure 1.)
8-2 Remove the thirteen (13) screws marked [210J]
and six (6) screws marked [210K]. The PNR circuit
board can then be removed. (Fig. 10)
9. Speaker Grilles L and R
(Time required: About 3 minutes)
9-1 Remove the lower case assembly. (See procedure 1.)
9-2 Set the eight (8) hooks [A] parallel to the groove in
the upper case assembly and remove the SP grille
L. (Fig. 1, Fig. 6)
* The speaker grille R can be removed in the
same manner.
• Lower case assembly
<Top view>
[200A]
Speaker L
C1
[200B]
C2 B2 C3
[200B] [200B]
Keyboard assembly
[200A]: Bind Head Tapping Screw-B 4.0X10 MFZN2W3 (WE974500)
[200B]: Bind Head Tapping Screw-P 3.0X20 MFZN2W3 (WF492000)
[200C]: Bind Head Tapping Screw-P 3.0X20 MFZN2W3 (WF492000)
10. PB Circuit Board and Wheel Assembly
(Time required: About 2 minutes)
10-1 Remove the lower case assembly. (See procedure 1.)
10-2 Remove the two (2) screws marked [210N] and
remove the PB circuit board with the wheel assembly
attached. (Fig. 10)
10-3 Pull out the wheel assembly from the PB circuit
board. (Fig. 11)
11. Speakers
11-1 Remove the lower case assembly. (See procedure 1.)
11-2 Remove the four (4) each screws marked [200A]
to the right and left. The speakers to the right and
left can then be removed. (Fig. 12)
PB
B3 C4
[200B]
Fig. 12
KB-180/SKB-180
(Time required: About 3 minutes)
Wheel assembly
Fig. 11
[200A]
C5 C6
[200B] [200C]
Speaker R
11