Tubbutec SH-1oh1 User manual

Tubbutec SH-1oh1
Midi retrofit and feature extension for Roland SH-101
Installation Manual
http://tubbutec.de
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Contents
Contents 2
1 Installation of the SH-1oh1 mod 3
1.1 Opening the SH-101 . . . . . . . . . . . . . . . . . . . . . . 3
1.2 CheckVoltage.......................... 3
1.3 Replacing the CPU with the socket . . . . . . . . . . . . . . 4
1.4 Solderingwires ......................... 4
1.5 Installation of SH-1oh1 processor . . . . . . . . . . . . . . . 4
1.6 Installing midi sockets . . . . . . . . . . . . . . . . . . . . . 5
1.7 Cutting the yellow battery wire . . . . . . . . . . . . . . . . 7
1.8 Pitch bend calibration . . . . . . . . . . . . . . . . . . . . . 8
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3
Disclaimer
Please note: When following this construction manual properly, damage to
the SH-101 synthesizer can be ruled out.
The following installation requires some soldering. It is not compli-
cated and only basic soldering skills are needed. However please practice
on something else then your expensive synthesizer.
Tubbutec is not responsible for any damage caused by improper instal-
lation.
1 Installation of the SH-1oh1 mod
The SH-1oh1 has been designed to make installation as simple as possible.
The original SH-101 CPU needs to be desoldered and replaced with a socket.
Additionally some wires need to be soldered to points on the SH-101 circuit
boards. In order to install the midi sockets you may need to drill holes into
the plastic case of the SH-101.
1.1 Opening the SH-101
Unplug all external connection from the SH-101. Then remove all the screws
on the bottom plate. The plate now comes off.
1.2 Check Voltage
An important first step is to check the voltage of the processor to make
sure it is not higher than 5.5V. If the SH-101 is calibrated correctly this is

41. INSTALLATION OF THE SH-1OH1 MOD
usually the case, however it is advised to measure the voltage between pin
20 (GND) and pin 40 (VCC) of the processor. It should be about 5.3V. If
is is higher than 5.5V adjust VR1 (D/A width) until it is about 5.3V. A
calibration as described in the SH-101 service manual will be necessary in
this case after installing the mod.
A voltage higher than 5.5V may destroy the SH-1oh1.
1.3 Replacing the CPU with the socket
As a first step the original cpu needs to be desoldered. Fortunately it is
only soldered on one side of the board so desoldering is relatively easy.
Remove all screws holding the brown ’SH-101 SYNTH BOARD’ in
place.After removing the two connectors on the opposite side of the key-
board, the board folds up.
You can now use a soldering iron and desoldering pump to desolder the
40 pin CPU. You may also use solder wick to remove the solder. Take out
the CPU and keep it. It can later be put back into circuit if desired for
some reason..
You can now solder the 40 pin socket in place of the CPU.
1.4 Soldering wires
Four wires need to be soldered to points on the SH-101 circuit boards. These
are the green, red, yellow and orange wires. They are already cut to the
correct length, stripped and tinned to make things easy for you. Pictures 1
and 2 show the positions of the wires. The red wire is for filter control, the
green for pitch bend, yellow for volume accent and orange goes to +15V.
Please do not omit the orange wire. The red wire’s soldering point is located
on the board beneath the SH-101 processor board between the ENV MOD
and VCF MOD faders. The green wire’s soldering point is located on the
bender board beside the keyboard. The yellow and orange wires need to be
soldered to the brown processor board.
When soldering the yellow wire to the middle pin of TR28 make sure to
not create any shorts.
1.5 Installation of SH-1oh1 processor
Put the SH-1oh1 board into the socket as shown in picture 1. Make sure to
not bend or break any of its pins. Now connect the wires to the SH-1oh1

1.6. INSTALLING MIDI SOCKETS 5
Figure 1: SH-1oh1 processor board placement and orange wire location
Figure 2: Location of yellow and red wires
using the connectors. The red and green wires should be on top. The color
codes on the SH-1oh1 show the wire’s correct positions. Do not interchange
them!
You can use the color codes provided on the SH-1oh1 to install the
socket’s connectors properly. The midi in connector with black and white
wires is placed in the lowest position with the black wire facing up. The
midi out connector is placed beside it with the grey and purple wires facing
up. The uppermost connector is placed with the red and green wires facing
up.
1.6 Installing midi sockets
The midi sockets can be installed in various ways as they can be detached
from the SH-1oh1 board. You can install them from inside the case or on
the outside. You can also of course not drill any holes at all and just put
them in the battery compartment. The socket with two wires (black and
white) is the midi in socket, the one with the three wires is midi out.

61. INSTALLATION OF THE SH-1OH1 MOD
Figure 3: Location of the green wire
Figure 4: Stencil for the connector holes
Figure 5: Hole location marked and drilled
Location of the sockets is also your choice, we recommend the space
below the MODULATOR text. (See picture)
Use the stencil provided to mark the location of the holes, then drill
with a wood or metal drill. Use a stepping drill for the large hole.

1.7. CUTTING THE YELLOW BATTERY WIRE 7
Figure 6: Holes drilled to final size and connectors installed
Ø 14
Ø 14
Ø 3.5mm
Figure 7: Drill aid for midi sockets
Figure 8: Cutting the yellow battery wire
1.7 Cutting the yellow battery wire
If you want to use your SH-1oh1 with batteries the yellow wire coming from
the battery compartment needs to be cut. This makes sure the circuit draws
no power when switched off and increases battery life. Image 8 shows where
to cut. There are two yellow wires: one that connect the upper with the
lower battery compartment. The other one is part of the wiring harness.
Only cut the one which is part of the wiring harness.

81. INSTALLATION OF THE SH-1OH1 MOD
1.8 Pitch bend calibration
After the installation of the SH-1oh1 the pitch bend signal needs to be
calibrated if it was installed. To do this play an A and send midi pitch
bend commands to the SH-1oh1 until the 101 is in tune. While it is in
tune switch to the config menu by pressing TRANPOSE + HOLD, press
U&D and then press the second highest keyboard key. You can now exit
the config menu by pressing TRANSPOSE.