decimal equivalent of a binary number, with each digit in the binary number
corresponding to a particular voice. For example, if the display reads
"
BAD
OSC 63
", it
would be broken down like this:
Decimal number -
63
Value of binary digits -
32 16 6 4 2 1
Binary equivalent -
1 1 1 1 1 1
Corresponding bad voices -
V6 V5 V4 V3 V2 V1
So if the display reads
"BAD OSC 63"
this means that all six of the voices
have failed the Oscillator section of the tuning. Now if the display reads
"BAD
WAVE 24*,
it would be broken down like this:
Decimal number -
24
Value of binary digits
32 16 6 4 2 1
Binary equivalent-
0 1 1 0 0 0
Corresponding bad voices -
— V5 V4 — — —
With
“BAD WAVE 24
“
Voices four and five have failed the waveform Calibration.
Note: When trying to display the tuning failures, be sure to watch the display,
because the failure displays are only shown for a short time.
When tuning failures are encountered, run the CALIBRATE function two more
times, If there are
no
more failures after the third attempt, Tuning is OK. This will
happen most often when the unit is cold.
3, DAC CALIBRATION -
To enter this mode, the MATRIX-6 must be in
MASTER EDIT parameter select mode. With parameter "52 CALIBRATE"
displayed. first press and hold the D button. Next, press and hold the C button
then press and hold the B button. The MATRIX-6 is now in DAC CALIBRATJOIM
mode and all three held buttons can be released. the display should read
"TUNING...'.
Caution:
Be careful not to short any pins when zeroing the DAC.
With a DVM in the millivolt range, set the DAC output to 0.000 volts. The DAC output is
measured al pin 6 of U712 on the Voice board. Connect the DVM ground to the
ground leg of C13 (the leg toward rear of unit). C13 is directly behind U704. Adjust
the DAC output to zero by turning the trimmer located directly behind U712.
To exit DAC CALIBRATION mode press the MASTER button.
Note: After zeroing the DAC, the MASTER EDIT parameter number
"
52 CALIBRATE" must be performed.
4. HFO CALIBRATION -
To enter the High Frequency Oscillator Calibration
mode, the MATRIX-6 must be in the MASTER EDIT parameter select mode.
MATRIX - Service Manual E C C
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