4
1. 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
