Oberheim Matrix-6 Service Manual

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 8 4 2 1
Binary equivalent - 111111
Corresponding bad voices - V6 V5 V4 V3 V2 V1
So if the display reads "BAD OSC 63 M this means that all six of the voices
have failed the Oscillator section of the tuning. Now if the display rea 's "BAD
WAVE 24 ", it would be broken down like this:
Decimal number - 24
Value of binary digits - 32 16 8 4 2 1 '
Binary equivalant - 0 1 10 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 CALIBRATION
mode and all three held buttons can be released. The display should read
"TUNING...". H y
Caution: Be careful not to short any pins when zeroing the DAC.
With a DVM in the millivolt range, sot the DAC output to 0.000 volts. The DAC
output is measured at 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 preformed.
4. HFO CALIBRATION - To enter ihe High Frequency Oscillator Calibration
mode, the MATRIX-6 must be in the MASTER EDIT parameter select mode.
MATRIX-6 Service Manual
ECC / Oberheim - Los Angeles, CA 90064 - Part U 950060 Page 2

Oberheim Matrix-6 Specifications

General

Polyphony	6 voices
Oscillators	2 DCOs per voice
Keyboard	61 keys
Memory	100 patches
MIDI	Yes
Type	Analog
Year Released	1985
Envelopes	3