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Oberheim Xpander - Service Manual

Oberheim Xpander
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Summary

Dual Microprocessor Interface

Gate and CV Inputs

VCO Temperature Compensation

High Resolution DAC

VCO and VCF Frequency Tuning

Pulse Width Calibration

Filter Resonance Calibration

Dual VCO CEM 3374

Signal Processor CEM 3372

Dynamic FM Implementation

Multi Function VCF

Test and Calibration

Power Supply Test

Checks specific voltage levels at the power supply connector for proper operation.

Main Processor ROM and RAM Test

Voice Processor ROM and RAM Test

LEDs Test

Vacuum Fluorescent Display Test

VFD Brightness Adjustment

4 Volt Reference Test

DAC Calibration

DAC Monotonicity Test

Analog to Digital Converter Calibration

DYM Method

Calibrates the ADC using the DVM's internal reference voltage.

Summary

Dual Microprocessor Interface

Gate and CV Inputs

VCO Temperature Compensation

High Resolution DAC

VCO and VCF Frequency Tuning

Pulse Width Calibration

Filter Resonance Calibration

Dual VCO CEM 3374

Signal Processor CEM 3372

Dynamic FM Implementation

Multi Function VCF

Test and Calibration

Power Supply Test

Checks specific voltage levels at the power supply connector for proper operation.

Main Processor ROM and RAM Test

Voice Processor ROM and RAM Test

LEDs Test

Vacuum Fluorescent Display Test

VFD Brightness Adjustment

4 Volt Reference Test

DAC Calibration

DAC Monotonicity Test

Analog to Digital Converter Calibration

DYM Method

Calibrates the ADC using the DVM's internal reference voltage.

Oberheim Xpander Specifications

General IconGeneral
TypeAnalog Synthesizer
Polyphony6 voices
Oscillators2 VCOs per voice
ControlMIDI
Synthesis TypeAnalog Subtractive
VCA1 per voice
Memory100 patches
ModulationExtensive modulation matrix
Year Released1984
FiltersMulti-mode filter per voice
Envelopes3 per voice
KeyboardNo keyboard
InputsCV/Gate
OutputsIndividual voice outputs

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