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Toshiba HX- MU 901 keyboard
Technical information
Version 1.1
By HansO, 2001
Checked and enhanced by Bas Kornalijnslijper
The information in this article is gathered by opening up a well-functioning
HX-MU901 musical keyboard and checking all connections. No guarantee is given
that this information is correct. You may use this information at your own risk.
1 Specification ..........................................................................................................2
2 Parts........................................................................................................................2
2.1 Key print ........................................................................................................2
2.2 Multi sensor print...........................................................................................2
2.3 Wiring............................................................................................................2
3 Circuit diagram of key print...................................................................................2
4 Block diagram of multi sensor print......................................................................4
5 Connections to multi sensor...................................................................................5
5.1 Circuit diagram of multi sensor.....................................................................5
6 Wiring....................................................................................................................6
6.1 Key-print15 pen connector out part to multi sensor print..............................6
6.2 Key print15 pen connector in line part to multi sensor print.........................6
6.3 External connector.........................................................................................7
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1 Specification
• Musical keyboard with 49 keys
• multi sensor
• can be used with Toshiba HX- MU900 MSX music module
• same connector as NMS1160 Philips keyboard but not compatible
2 Parts
The parts of the keyboard are:
2.1 Key print
A printed circuit underneath the keys with:
• 15 pen connector: 8 out lines, 7 in lines
• 49 switches underneath the keys
• 49 diodes
• a printed circuits that implements the matrix as shown in the circuit diagram
• 49 diodes
2.2 Multi sensor print
A printed circuit underneath the multi sensor with wires from keyboard print to
connection print at multi sensor
• Connector for in lines (7)
• Connector for out lines (8)
• Two connectors for outside wiring
• Connector for multi sensor (flexible wires)
2.3 Wiring
Wiring connects all prints and the external connector
3 Circuit diagram of key print
On the next page sthe circuit diagram is shown. Shown in landscape!
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4 Block diagram of multi sensor print
8 red
1 green
Out lines
keyboard
To external
connector 2
1
Multi sensor
14 diodes
10 brown/white
1 black
8
greenwhite
1 violet
7 red
In lines
keyboard
To external
connector 1
1 red
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5 Connections to multi sensor
The multi sensor is connected with a flexible 16 line wire to the multi sensor print. It
shares some of the in lines as scanning matrix lines and has two separate out lines
(black and white from external connector 2).
The numbering for the multi sensor connector seen from the bottom side of the print
is shown in the next figure.
5.1 Circuit diagram of multi sensor
Notes:
• Numbering of the diodes is the numbering of the multi sensor connector
• Numbers at the top are the numbers of the external connector 2
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6 Wiring
6.1 Key-print15 pen connector out part to multi sensor print
Connects:
• print connector out lines keyboard to
• external connector 1
Pen Key print 15 pen connector
out part
To external connector 1 Pen
1 Red Red 8
2 Blue Red/white 7
3 Black Orange 6
4 White Orange/white 5
5 Yellow Yellow 4
6 Orange Yellow/white 3
7 Violet Green 2
8 Green/white Green/white 1
6.2 Key print15 pen connector in line part to multi sensor print
Connects:
• Key print connector in lines part
• to external connector 2
• multi sensor
Key
print
Multi
sensor print
Key print15 pen connector
in part
To external
connector 2
9 7 Red Black 1
10 6 Blue Blue 2
11 5 Black Blue/white 8
12 4 White Purple 7
13 3 Yellow Light green 5
14 2 Orange Grey 4
15 1 Violet Light blue 3
brown 6
White 9
Brown/white 10
Notes
• Pens 1 to of the external conenctor are connected via diodes to the multi
sensor
• External connector pens 6, 9 and 10 are for the multi sensor, see that
paragraph
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6.3 External connector
Pen Pen
1 Brown 2 Brown/white
3 Red 4 Red/white
5 Orange 6 Orange/white
7 Yellow 8 Yellow/white
9 Green 10 Green/white
11 Blue 12 Blue/white
13 Violet 14 Light green
15 Grey 16 Light blue
17 White 18 Pink
19 Black 20 Shielding
Notes:
These wires are not connected to the keyboard switches:
• Wire 18 (pink) is not connected in the keyboard
• Wire 20 (shielding) is only connected to the chassis
When one of the wires in the cable is broken, you can substitute the broken one with
either wire 18 or 20
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