Oberheim Matrix-6(R) -1985    Weight = ? Lbs. Number manufactured = ? MSR = $1695/$999(R)


User Manual: Manual Manor
Reset Proceedures: N/A
Operating System code:
MIDI or other control protocol: Youngmonkey.ca
Software related Links: Overacker
Patches or knob settings: Overacker
Circuit Overview: below
Scematics/Service Manual: Manual Manor
Common Service Issues/Tips: below
Parts Sources: Keys knobs semiconductors misc
Uncommon chips/modules used: 68B09 CPU, 82C54 Timers, AM6012 DAC, CEM3396 voice
Modifications:
General Info Links: Vintage Synth Explorer





Circuit Overview:
     Analog subtractive with digital control galore. 12DCO 6 voice.

Service Tips:
     The schematics online are very sketchy quality. I extrapolated from this page on the Matrix 1000 what the CPU was since I'm fairly sure they use the same chip. I was hard pressed to read that detail in the poor scan until seeing that.

Here is a quote from a post in the synth DIY group from Lorne Hammond as a troubleshooting pathway:

Three options:

1) Have you had it all recalibrated?  At Master Edit, Push A, select
parameter 52  Push D when you see "52 calibrate", at "ready?" Push Yes.
That will do the HFOs, VCF frequency, pulse width, resonance amount and VCA2
levels and give error messages if there are problems:  Bad HFO/VCF?RES?VCF
**.  The ** is the number of the voice that has the problem but it binary. 

2) Processor reset.  AC power off, push the red store button and hold down
while powering up.  Display flickers, release store, blank screen and then a
display of "00".

3) Power supply okay?  Usual caveats about don't get yourself killed, you do
know what your doing? Etc.
J03 is the power supply connector on the power supply board, you should see
thee measurements at the connector:
Pin 1		-5 volts   200mv
Pin 3,4 	+5A volts   "
Pin 5,6	+5B volts	"
Pin 7,8	+12 volts  500mv
Pin 9,10	-12 volts    "
And -42 vots tolerance -41v- -45v behind the flourescent display,
noncmponent side at the point labelled -42.

Lorne in Canada

Parts:
Aside from some of the Curtis chips and maybe CPU I stock everything all the time electronically. I've gotten the chips when needed from other techs or off ebay. Knobs may be difficult to find exact replacement. The switches are available from analogdiehard@att.net I hear.
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