PC board # R-10


This module may easily be tested using a monitor amp. Plug the output (square) of the top—most POSITIVE SLEW into the amp. Turn the internal frequency control fully clock-wise (lower of the two knobs). Patch pulse output into the main input (diamond). You should now hear a sawtooth wave at about 2000 cps, or two octaves above middle C. Un-patch the patchcord from the diamond input jack and re-patch first into the "start" pulse input, and then into the "sustain" pulse input. In both instances, you should have heard a sawtooth slightly lower i in pitch than previously. Leave patched into the "sustain" input, and patch a new patch cord from the blue output into the VC input. You should hear an upward change in pitch as the processing knob is turned right, and a lowering of pitch as it is turned towards the left. The processing knob is, of course, the knob just above the internal rate control. Turn the internal rate control over its range. The module should work from above 2000 cps. to well below a cycle each ten seconds. Tune the SLEW to 2000 cps. Un-patch the monitor amp from the blue output and repatch into the pulse output. You should hear a pulse wave from this output. This completes the test for the top-most POSITIVE SLEW. Repeat the above procedure to test the bottom SLEW. Note that the bottom SLEW is tuned an octave below (1000Cps.) the top unit. This allows the bottom most SLEW to output much slower sub-sonic frequencies, well below a cycle each 20 seconds.

Please refer to troubleshooting prolcedures if this module does not pass some of the tests above.