Table of Contents
1
INTRODUCTION ............................................................................................................................... 4
1.1
T
RACKING
D
OWN
V
OICES
............................................................................................................ 4
1.2
I
S
A
NYTHING
R
EALLY
W
RONG
?................................................................................................... 4
1.3
D
OES THE INSTRUMENT NEED A CALIBRATION
?............................................................................ 4
1.4
C
ARD
S
UMMARY
.......................................................................................................................... 6
1.4.1
Mixer Card.............................................................................................................................. 6
1.4.2
VCO Card ............................................................................................................................... 6
1.4.3
VCF Card................................................................................................................................ 6
1.4.4
DAC Card ............................................................................................................................... 6
1.4.5
DIGIMOD Card...................................................................................................................... 6
1.4.6
ANAMOD 1 Card.................................................................................................................... 6
1.4.7
ANAMOD 2 Card.................................................................................................................... 6
1.4.8
CPU Card ............................................................................................................................... 6
1.4.9
Pot Panel................................................................................................................................. 7
1.4.10
Switch Panel....................................................................................................................... 7
1.4.11
Jack Bay ............................................................................................................................. 7
1.4.12
Power Supply ..................................................................................................................... 7
1.4.13
Keyboard ............................................................................................................................ 7
1.5
S
IGNAL
F
LOW
D
IAGRAMS
............................................................................................................. 8
2
MIXER CARD................................................................................................................................... 10
2.1
T
HEORY OF
O
PERATION
.............................................................................................................. 10
2.2
VCA
O
PERATION
....................................................................................................................... 10
2.3
H
EADPHONES
............................................................................................................................. 11
2.4
N
OISE
......................................................................................................................................... 11
2.5
C
ALIBRATIONS
........................................................................................................................... 11
3
VCO CARD ....................................................................................................................................... 12
3.1
T
HEORY OF
O
PERATION
.............................................................................................................. 12
3.2
VCO
O
PERATION
....................................................................................................................... 12
3.3
A
UTO
T
UNE FUNCTIONALITY
...................................................................................................... 13
3.4
DC
V
OLTAGES
............................................................................................................................ 14
3.5
C
ARD
P
IN
S
IGNALS
..................................................................................................................... 14
3.5.1
Inputs .................................................................................................................................... 14
3.5.2
Outputs.................................................................................................................................. 14
3.6
T
ROUBLESHOOTING
T
IPS
............................................................................................................ 14
3.6.1
Step 50-71: Waveform Tests................................................................................................. 15
3.6.2
Step 72-73: Sync Check......................................................................................................... 15
3.6.3
Step 74-75: Linear FM Check............................................................................................... 15
3.6.4
Step 76-79: Modulation Test................................................................................................. 15
3.7
T
YPICAL
P
ROBLEMS
A
ND
S
OLUTIONS
........................................................................................ 15
3.7.1
Letter “A” appears ............................................................................................................... 15
3.7.2
Letter “B,” “C” or “D” appears ......................................................................................... 16
3.7.3
Letter “E” appears or other pulse width problems .............................................................. 16
3.7.4
No sub octave ........................................................................................................................ 16
4
VCF CARD ........................................................................................................................................ 17
4.1
T
HEORY OF
O
PERATION
.............................................................................................................. 17
4.2
VCF
O
PERATION
........................................................................................................................ 17
4.3
C
ALIBRATIONS
........................................................................................................................... 18
4.4
VCO
M
ULTIPLEXING
S
YSTEM
.................................................................................................... 19
4.5
DC
V
OLTAGES
............................................................................................................................ 19