Casio MP-2000 Service Manual page 35

In case of QT-7063D
1 Connect a loop back connector on Customer display stand unit.
2 Connect a testing customer display to Display signal connector.
3 Apply +24V DC to the AC adaptor jack.
TXD
DSR
RXD
DTR
PCB
Loop back connector Display signal connector
AC adaptor jack
CN3
5
9
4
8
3
7
2
6
1
PRINTER
Female
5
9
4
8
3
7
2
6
1
HOST
Male
Sub PCB
Loop back connector circuit diagram
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5
9
4
8
3
7
2
6
1
5
9
4
8
3
7
2
6
1
Loop back connector