In the tune test, each
voice oscillator is checked against A-440. The error is displayed on the LED
display (00-99), with negative values being indicated when all three
PROGRAM, PARAMETER, and VALUE LEDs light. Three display digits equals one
DAC bit. All voices must read within two DAC bits (six digits) of each other
for each key tested. Otherwise may indicate a bad voice.
1. If the
610 [Six-Trak] is Rev. A (serial numbers 1-900), a small modification maybe
required (or may have already been performed):
a. Cut trace at
U146-2.
b. Jumper U146-2 to U146-6.
2. Hold CONTROL RECORD
and press SELECT 9. (enables the tune test)
3. Center the PITCH
wheel.
4. Hold CONTROL RECORD and press SELECT 3. (initalize PITCH
wheel)
5. Hold CONTROL RECORD and press SELECT 8. (selects the basic
patch)
6. Hold CONTROL RECORD and press SELECT 6 (manually tune) If
when doing this procedure a voice is found to be out of the six-digit range,
manually return and check the voice agian. If the voice then tunes fine,
accept it but keep your eye on it for unreasonable drifting.
7.
While holding C2, watch the display, and adjust MASTER TUNE for the closest
indictaion to 00. (The knob will operate in units of three). After
adjusting, do not readjust unit the test is finished.
8. While in
the tune test, pressing the same note advance the voice assignment so you
can test all six voices one after the other by just pressing the key.
9. Check that all voices are within six digits of each other (at
C2).
10. Check all voices at each of the white keys in this octave
and at C3 and C4 (highest key).
11. Select PARAMETER 00 COARSE
FREQUENCY, and adjust its value to maximum (48).
12. Check each voice
at each C.
13. Check each note in the top octave.
14. If the
display read +/- 99, the voice tuning it too far out of range for the
computer to measure.
15. To exit test, CONTROL RECORD + SELECT 9, or
reset.
