Oberheim xpander service manual 2
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Page 1
AB EOFIQN EN §
Intrndncuan Page 2
Mechamca} assamhlg . Page 3
Xpander circumg uvemew .. Page 4
Theurg a! operalian
Swuchmg pgwer supplg., . Page 5
Dual mcruprucessar Interface . Page B
Step eucugerm ,, . .. . .. Page IO
Vacuum flunrescsmdlspiays . Page 12
Gems and CVS In .. W Page IA
VCD temperature compensation . Page m
vah resuluuon DAC ,, Page 18
VCD and VCF (requencg (unmg Page 20
Pulse width calvbrahgn ., . . Page 20
Film resonance calibration .. Page 2
Dual VEU CEH 3374 ., . Page 22
Blgnal pracessgr CEH 3372 , . Page 23
Dgnanuc FM vmplememaunn . Page 24
Mum thUUfl VEF H Fags 26
Smoothmg sample and hold. . a V ., .. Page 25
Prngrammame pannmg ..... . .. Page 30
Test and cahbraiian ,, ., . . Page 32
Mvscellanegus (snflware res averston number, unlune), Page 35
Schemaucs and parts \aguul . ., ., ., Page 39
Uberhevm part number cross reference, Page 60
Engineering change urders page 69
xpanaer servme manual Page x
Page 2
INTRODUCTION
The deslgn ohvlusopng aehmd the Xaander was to vnclude all the
features at a modular syntheslzer m a programmable and easy to use
lnstrument At the same time reliamhtg, accuracy, and Base at servlcmg
have been a prime concern through everg step at the design The result vs
the most complete and accurate analog oolgphonm synthesizer ever built,
despite the mclusion at 6 trlmmers
Besxdes the schematics and the calibration procedure, this manual
includes basic explanatlons of some ol the ltoander's clrcults We hope that
deeplte thelr simplicity they will lead you to a Better understanding m the
Xpander and therefore to taster and easier sarvlcmg
All ot the Kpahder general operation procedures are cantam In the
Xpander Owner's Manual
When ordering spare parts {ram Uberhelm ElecllUMDS, always minus:
the Uherheim mart number (see the Uherhevm part number cross
reference at page 60). Thls wull speed do your order and avmd oossrole
EI'FUTS
Warnina: To avoid loss of data Save customer'5
data on taggprior to any technical servicing;
Meander servme manual Page 2