Yamaha Portable Grand DGX-220 Service Manual page 12

DGX-220/YPG-225
6. AM (AMJK 1/6), AMJK 4/6 and AMJK 5/6 Circuit
Boards
(Time required: About 6 minutes)
* The AMJK 4/6 and AMJK 5/6 circuit boards are connected to the
AM (AMJK 1/6) circuit board via wirings.
6-1 Remove the lower case assembly. (See procedure 1.)
6-2 Remove the master volume knob from the control panel. (Fig.8)
6-3 Remove three (3) screws marked [180D]. The AMJK 4/6 circuit
board can then be removed from the upper case. (Fig.6)
6-4 Remove two (2) screws marked [180E]. The AMJK 5/6 circuit board
can then be removed from the upper case. (Fig.6)
6-5 Remove seven (7) screws marked [180F]. The AM(AMJK 1/6),
AMJK 4/6 and AMJK 5/6 circuit boards can then be removed. (Fig.6)
7. PNR (PN 1/5) and PN 2/5 Circuit Boards
(Time required: About 6 minutes)
* The PN 2/5 circuit board is connected to the PNR (PN 1/5) circuit
board via a wiring.
7-1 Remove the lower case assembly. (See procedure 1.)
7-2 Remove the encoder knob from the control panel. (Fig.9)
7-3 Remove four (4) screws marked [180H]. The PN 2/5 circuit board
can then be removed from the upper case. (Fig.6)
7-4 Remove twelve (12) screws marked [180I]. The PNR (PN 1/5) and
PN 2/5 circuit boards can then be removed. (Fig.6)
8. PNL(PN 3/5) Circuit Board
(Time required: About 8 minutes)
8-1 Remove the lower case assembly. (See procedure 1.)
8-2 Remove the AM(AMJK 1/6), AMJK 4/6 and AMJK 5/6 circuit boards. (See procedure 6.)
8-3 Remove ten (10) screws marked [180G]. The PNL (PN 3/5) circuit board can then be removed. (Fig.10)
12
Upper case
(Fig.10)
[180]: Bind Head Tapping Screw-B 3.0X8 MFZN2W3 (WE774300)
MASTER VOLUME
(Fig.8)
Cloth
(Fig.9)
[180G]
PNL
(PN 3/5)
Cloth
Encoder knob