Sequential PROPHET-600 - 1-9 MIDI

c. Press RECORD (on the Prophet).
d. Start recorder in record mode.
e. Alter three seconds, press TO TAPE.
f. Check that the record level is 0 dB or slightly into the red.
g. When FROM TAPE blinks, stop recorder and rewind.
h. To verify, start playback.
i. Press FROM TAPE.
j. When FROM TAPE goes out, stop the recorder. The programs have been
recorded and verified.
k. Leave some space on the tape between the program file and the beginning of
the sequence file.
l. If used, note tape counter setting or reset to 000 (as your prefer).
m. Press RECORD.
n. Start recorder in record mode.
o. After three seconds, press TO TAPE.
p. Press either SEQ I or 2 (within 3 seconds of TO TAPE).
q. When FROM TAPE blinks, stop recorder and rewind.
r. To verify, start playback.
s. Press FROM TAPE.
t. When FROM TAPE goes out, stop the recorder. The sequences have been
recorded and verified.
5. If you can work with the user's programs, fine. Otherwise load the standard Factory
Programs:
a. Load the Factory Program cassette and rewind to start.
b. Press RECORD (on the Prophet).
c. Start recorder in play mode.
d. Press FROM TAPE.
e. When the FROM TAPE LED goes out, stop the recorder.
6. Check that your favorite Factory Programs sound as they should. (Programs 11
through 18 are similar to the Prophet-5.) If all voices in a program seem wrong or
somehow altered, suspect memory or the monophonic sample/holds. If one or
occasional notes are bad, suspect a voice or one of its four sample/holds (OSC A, OSC
B, FILTER, AMP).
7. To check the power on/reset circuit, randomly switch power off and on a few times.
Check again that a few programs haven't been altered.
8. Play and listen to the tuning. If a Prophet-600 is claimed to be out of tune, you must
first assume that the scaling procedure—which has been published in the Operation
Manual—has been incorrectly performed. A poorly-scaled machine exhibits greater
"beating" between voices, particularly as the PITCH wheel is rotated to its extremes.
If tuning is the main service problem, allow the instrument to warm-up thoroughly (ft -
1 -hour) then perform the scaling procedure (see page 1-11). In the meantime, continue
with functional testing.
9. Select programs with short envelope timings and check that every key works. Strike
every key hard and fast, to try to uncover bouncing contacts. Identify any scratchy or
intermittent keys by applying masking (or other low-tack) tape.
10. Test all PROGRAM SELECTS and PROGRAM display segments, by selecting
programs 00, 11, 22, 33 ...99.
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