Upper Case Side - Yamaha Portatone PSR-740 Service Manual

Upper case side

INV
[240A] [250A] [240A] [250A]
[250C] [250C]
[250A]
Shield cover L
[240A] [250A]
Fig.2
[240]: Bind Head Tapping Screw-P 3.0 X 8 MFZN2Y (EP600280)
[250]: Bind Head Tapping Screw-P 3.0 X 6 MFZN2Y (VK600130)
7. PN(WH1), PN(WH2) and PN(WH3) Circuit Boards
7-1 Remove the lower case assembly. (See procedure 1.)
7-2 PN(WH1) Circuit Board (PSR-640):
Remove the two (2) screws marked [190A]. The wheel
assembly can then be removed. Remove the wheel with
the spring from the wheel assembly. (Fig.3)
7-3 PN(WH2) Circuit Board (PSR-740):
Remove the two (2) screws marked [190B]. The
PN(WH2) circuit board can then be removed with the
wheel. Remove the wheel from the PN(WH2) circuit
board. (Fig.3)
7-4 PN(WH3) Circuit Board (PSR-740):
Remove the two (2) screws marked [190C]. The wheel
assembly can then be removed. Remove the wheel with
the spring from the wheel assembly. (Fig.3)
Shield cover U
Upper case side
[250A] [250B]
[240G]
Speaker
DM
〈Tweeter〉
[240G]
Keyboard assembly
[270B]
[30]: Bind Head Tapping Screw-P 3.0 X 8 MFZN2BL (EP630220)
[190]: Bind Head Tapping Screw-P 3.0 X 8 MFZN2Y (EP600280)
Fig.3
[240]: Bind Head Tapping Screw-P 3.0 X 8 MFZN2Y (EP600280)
[250B]: Bind Head Tapping Screw-P 3.0 X 6 MFZN2Y (EP600130)
[270B]: Bind Head Tapping Screw-P 3.0 X 25 MFZN2Y (VK228100)
MIC
[240B]
[240B]
[250A]
MIC-JACK
[240A] [250A] [240C]
[240D] AM AM
[240E] (PSW) (VR)
[240G]
Speaker
〈Tweeter〉
[240G]
[240F]
AM ( AM )
PN
(WH2)
[240D]
PN
(WH3)
(WH1)
MKS3
[190B] [190C] 〈PSR-740〉 〈PSR-640〉
[30] [270B]
X 2 X 2
8. Speakers(Tweeter)
8-1 Remove the lower case assembly. (See procedure 1.)
8-2 Remove the four (4) screws marked [240G]. The right
and left speakers(tweeter) can then be removed. (Fig.3)
9. Keyboard Assembly
9-1 Remove the lower case assembly. (See procedure 1.)
9-2 Remove the two (2) screws marked [270B]. The keyboard
assembly can then be removed. (Fig.3)
10. PN(PN1), PN(PN2), PN(PN3), PN(PN4) and
PN(ENC) Circuit Boards
10-1 Remove the lower case assembly. (See procedure 1.)
10-2 Remove the DM circuit board. (See procedure 2.)
10-3 Remove the one (1) screw marked [240H]. The shield
cover U can then be removed. (Fig.3)
10-4 Remove the AM(AM) circuit board. (See procedure 6-2.)
10-5 Remove the keyboard assembly. (See procedure 9.)
10-6 PN(PN1) Circuit Board:
Remove the one (1) screw marked [190D]. The PCB
bracket can then be removed. (Fig.4)
Remove the six (6) screws marked [190E]. The angle
brackets can then be removed. (Fig.4)
Remove the thirty (30) screws marked [190F]. The
PN(PN1) circuit board can then be removed. (Fig.4)
10-7 PN(PN2) Circuit Board:
Remove the four (4) screws marked [190G]. The
PN(PN2) circuit board can then be removed. (Fig.4)
PN(PN3) Circuit Board:
10-8
Remove the five (5) screws marked [190H]. The
PN(PN3) circuit board can then be removed. (Fig.4)
10-9 PN(PN4) Circuit Board:
Remove the two (2) screws marked [190F] and the two
(2) screws marked [190I]. The PN(PN4) circuit board
can then be removed. (Fig.4)
10-10 PN(ENC) Circuit Board:
Remove the three (3) screws marked [190J]. The
PN(ENC) circuit board can then be removed. (Fig.4)
When removing the PN(ENC) circuit board, the ENC
knob will be removed simultaneously.
PN
PN
( PN1 )
[190A]
PN
( PN2 )
LCD U
Back-lit assembly
LCD L
[190F] [190G] [190M] [190K]
[190M]
X 30 X 4 X 4 [190L] X 4 [190H] X 5
[190D]
PCB bracket
[190F] [190E] [190E] [190F]
PN
X 3
( ENC )
PN
Angle bracket Angle bracket
[190M]
[190M]
( PN4 )
[190]: Bind Head Tapping Screw-P 3.0 X 8 MFZN2Y (EP600280)
Fig.4
PSR-740/PSR-640
PN
( )
PN3
[190I]
X 2
11