EFM Synthesizers EFM Mad Mouse Pro, Assembly And Setup Manual, Page: 10 / 27

If you have a scope. Measure Pins 15 and 16 of U5. You should see the PIC clock running at about 10MHz.. Pin-3 of U9 is
multiplexed data ( looks like a changing staircase) when a midi key is played.
PIC U5 Pins 15 & 16 10MHz 4051 U9 Pin 3 (C3 midi-kbd) 4051 U9 Pin 6
4051 U9 Pin 8 4051 U9 Pin 9 4051 U9 Pin 10
With a digital probe or scope you should see a low going pulse on pin-6 of U4 when a midi key is played. If not power down and
reverse the wires going to the midi jack then try again. Your keyboard may or may not generate midi clock
6N138 U4 Pin 5 Midi Clock 6N138 U4 Pin 5 Midi Data
Set your meter to DC Volts.
Measure the voltage on pin-7 of U7. Adjust T1 until it's -10.56VDC.
Measure the voltage on the GATE and CV outputs when you play the keyboard.
PAD-I is Pitch-CV 1V/Oct .
PAD-L is Pitch-Bend and should be 0-5VDC as the PB lever is applied.
PAD-M is a 0-5VDC gate.
PAD-P is 0-5VDC as the MOD lever is applied.
PIN-8 of U10 is 0-5VDC glide-gate when two keys are played.
Unplug the transformer.