Service Manual (Xpander)
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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