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Testing
Since there are two sections, we will test each one in turn. The easiest and the best to test first
is the LFO function. Simply flip the LFO/EG switch into the LFO mode. Set all the UP and
DOWN pots to their minimum, and make sure the MOTM’s bypass function is off. Now set
the UP/DOWN control to position 7. The Output LED should now start to move between
two different colours. One cycle should take about a second or so. Adjust UP/DN and see if
the Output LED flashes with varying rates. If it doesn’t then switch off and check everything
again.
If this is OK, then set the module to EG mode and set it to AR and GATED mode. Set the
UP/DN pot to level 7. Now press the GATE button and keep your finger there. Does the
GATE and SET LEDs light up immediately? Does the OUT LED quickly rise in brightness?
Now let go of the GATE switch. The GATE and SET LED should go out, and the OUT LED
diminish over a short time.
Now flip it to AD mode, now press GATE again. The GATE LED should stay on, the SET
LED should stay on whilst the OUT LED rises. Then should go out as the OUT LED
diminishes.
Now set the module to RESETABLE and AR mode. Briefly pressing gate should make the
OUT LED rise, and stay on. Pressing RESET should slowly extinguish it.
Check that the UP and DOWN pots on the OMS-820 actually do what they should. They
should simply replicate the ones on the MOTM-820.
If that all works, you should have a completely working module.
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