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Service Manual (Xpander)

Cover

Table Of Contents: 1

Introduction: 2

Mechanical assembly: 3

Xpander circuitry overview: 4, 5

Theory of operation:

Switching power supply: 6, 7
Dual microprocessor interface: 8, 9
Step encoder 10, 11
Vacuum fluorescent displays: 12, 13
Gates and CVs in: 14, 15
VCO temperature compensation: 16, 17
High resolution DAC: 18, 19
VCO and VCF frequency tuning: 20
Pulse width calibration: 20
Filter resonance calibration: 21
Dual VCO CEM 3374: 22
Signal processor CEM 3372: 23
Dynamic FM implementation: 24, 25
Multi function VCF: 26, 27
Smoothing sample and hold: 28, 29
Programmable panning: 30, 31

Test and calibration: 32, 33, 34, 35

Miscellaneous (software reset & version number, untune): 36, 37, 38

Schematics and parts layout: 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59

Oberheim part number cross reference: 60, 61, 62, 63, 64, 65, 66, 67, 68

Engineering change orders: 69, 70. 71, 72

Appendix: 1, 2, 3, 4, 5, 6, 7, 8

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