Sequential prophet 5 - Page 118

32. Select patch 5-1 and switch scope timebase to 0.5 ms/div.
33. Alternately key C3 and C5 and trim V1-R414. OSC 1A HI V/OCT so tailing edge of both notes is
centered on the scope. See Waveforms 4-3A and B.
34. Since these adjustments interact, repeat steps 32-35 until no improvement is possible.
35. Probe the remaining oscillators, and trim as in steps 32 - 36. For the five OSC Bs, trim R408 V/OCT
and R412 HI V/OCT.
36. Select patch 5-2 and switch scope timebase to 2 ms/div.
37. Now close-up the Prophet and let it sit for 10-15 minutes before continuing. It is not necessary
to replace the cabinet screws. Ideally, continue in a very warm room to more closely simulate
operating conditions. Final tuning must be done as quickly as possible, to minimize frequency
drift from changing temperature.
38. Probe the ten OSC sawteeth and trim their V/OCfc for centered falling edge while keying CO
and C5.
Waveforms 4-3
OSCILLATOR TUNING, steps 32-35
4-12