8
CIRCUIT BOARD LAYOUT
PSR-740/PSR-640
Upper case
LCD U
LCD L
Pitch bend wheel
Modulation wheel
( PSR-740 only
)
Keyboard assembly
Lower case
Floppy disk drive
( FDD
)
AM
( HP
)
Speaker L
( Woofer
)
JACK
Speaker R
(Woofer)
Speaker R
(Tweeter)
(AM)
( PSW
)
Speaker L
<
Tweeter
>
( VR
)
<
PSR-740 only
>
MKS3
MK-L
( PN2
)
( ENC
)
( PN1
)
LCD L
LCD U
Back-lit assembly
( PN3
)
( PN4
)
( WH2
)
( WH3
)
<
PSR-740
>
<
PSR-640
>
( WH1
)
q
q
w
w
e
e
r
r
t
y
y
u
i
o
!0
!0
@4
@5
@6
@6
@7
@1
@8
#0
@9
#0
#1
#2
#2
@5
@4
!2
!3
!4
!4
!5
!5
!1
!6
!7
!8
!9
@0
@0
@0
@1
@2
@3
AM
DM
<
PSR-740 only
>
MIC
AM
AM
PN
PN
PN
PN
PN
PN
PN
PN
MK-H
MIC-JACK
INV
@2
@3
Summary of Contents for PortaTone PSR-640
Page 4: ...4 PSR 740 PSR 640 ...
Page 22: ...22 PSR 740 PSR 640 DM Circuit Board PSR 640 Component side Pattern side 2NA V350510 1 2 1 ...
Page 27: ...27 PSR 740 PSR 640 ...
Page 28: ...28 PSR 740 PSR 640 ...
Page 32: ...32 PSR 740 PSR 640 ...
Page 33: ...33 PSR 740 PSR 640 ...