Boss Dr. Rhythm DR-100 User Manual

Boss DR-110 MIDI Interface Manual

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Assembly

The converter comes in two parts - the unit itself and the connector to be installed in the DR-

110. The main unit comes either assembled or as a kit. With both, the connector needs to be
installed in the DR-110.

Tools required

• Screwdriver

• Soldering iron

• Drill

• File or preferably rotary tool

• Multimeter (recommended)

Constructing the Unit

Solder the components to the PCB as per the

diagram to the left. The order of soldering is
not particularly important, but a good order
would be: large chip socket, 8 trigger resistors,
8 transistors, the diode, the 2 other resistors,
then the remaining chip, switch, MIDI port and
10-way connector.

The 8 resistors beside the chip and the one
beside the 10-way connector should all be
10kΩ (Brown Black Orange). The resistor

beside the MIDI port should 220Ω (Red Red

Brown).

The legs of the transistors must be bent to fit
in the holes. The easiest way is to line up two
legs into the correct holes and then turn the
transistor until the third lines up. The
transistors may sit at different heights
depending on how far they are pushed in.

The resistors can be inserted in either
direction, but the other components must be
inserted in the direction shown. Ensure the
black band of the diode faces towards the MIDI
port and the 8 pin chip has its dot aligned
towards the semicircle in the picture.

The controller chip can now be inserted for
testing.

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To ensure the PCB has been soldered correctly,

the next step is to make and then install the
connector for the DR-110 and check the two
units work together. This step is very delicate
and involves separating and stripping the end
of the wires of the ribbon cable so they line up
with the pins mentioned in the next section.

Refer to the next section for fitting it in the
unit.

The final step is to affix the PCB to the

enclosure. The controller chip will need to be
removed for this.

The PCB should be aligned with the enclosure
lid so the edge of the PCB is just within the lip
of the lid, as shown to the left. Guide marks
should be drawn onto the lid through the bolt
holes. These holes should then be drilled and
the PCB bolted in place. The three short bolts
included are for this. Care must be taken not to
tighten them too much as that could
potentially damage the board.

Once this is done, the controller chip can be

inserted into the socket.

Then the lid can be aligned with the case and
guide marks for the 10-way connector slot can
be made. There are many ways to remove the
plastic of the slot, but the fastest seems to be
to use wire cutters to cut away as much plastic
as possible and then file it down to neaten it

up. Once that is removed, the lid should fit into

the case.

Next, a hole can be made in the case for the
MIDI port. There is no simple way to locate the
hole other than measuring or estimating its
position. A stepped drill bit is the best way to
make the hole.

Finally, the lid and PCB can be screwed in place
onto the case.

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