Advertisement
ELEX K2 (Hohner Stringvox) (r3): Wiring Diagram
Mains
Fuse
Top
(220/240V AC)
(T500mA)
Pedal Board
Panel
(DIN 41622-16)
9
–26
8
–15
GND
7
6
GND
+12
5
4
+13
3
2
+20
+27
1
PSU
(with K2-0)
43K 5%
The PSU as drawn here is
The extra (pink)
specific to the K2r3 as seen;
wire to ground
earlier revisions had
from the sustain
different wiring connectors
pedal socket
and layouts.
may not have
Terminal numbers given
been used in
here are my additions.
earlier revisions.
Ground tag strip:
Without desoldering or cutting the
lacing the exact location of ground
wires on tag terminals cannot be
determined, but they're commoned.
Sust.
Piano
Gen. Vol.
Piano
/Harp
Bass
General
(DIN-5-180)
(TS)
(TS)
(TS)
(TS)
Pitch
3
Tn
Tn
Tn
Tn
S
T
S
T
S
T
S
T
5
1
100K
5%
13
Strings (bass) decay
12
Cello (bass) decay
11
Bass audio normal return
1
shields
1
K2-14
10
PH(B) audio output
9
+20
1
1
shields
8
Strings (bass) audio
7
Cello (bass) audio
1
shields
6
PHB (bass) audio
5
PHB (bass) audio return
4
strings treble busbar +20
K2-110
3
ensemble busbar +20
2
Bass audio output
(an earlier revision may have
1
shield
had a K2-11 board here)
Keydeck Chassis
F1 F 1 G1 A 1 A1 B 1 B1
C1 C 1 D1 E 1 E1
F2 F 2 G2 A 2 A2 B 2 B2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
a
b
49a 50a 51a 52a 53a 54a 55a 56a 57a 58a 59a 60a
62
63
ensemble
strings bass
busbar
busbar
(+20)
(F1–E2) (+20)
1
1
sustain pedal
2
+13
3
PHB (bass) audio
4
shield / GND
5
–26
6
7
Strings (bass) audio
8
Strings (bass) decay
9
Cello (bass) decay
10
Cello (bass) audio
11
GND
12
GND
13
4R7 5%
+13
14
–15
2 × 27K 5%
K2-6
12
shield
11
the pedal input is labelled
general volume (pedal)
10
shield
"Gen. Vol." but it only affects
9
all strings audio output
22K 5%
the strings voices.
8
GND
7
+27
5
–13
4
+13
2
shield + foil shields
1
all strings audio
Terminal numbers for the M175
connector are my additions.
Earlier revisions did not use the
red and blue wires to pins 4 & 5.
I/O
In one earlier revision, the bass
Panel
pedal connector and pitch trimmer
were located on the underside.
This is the 16-pin type connector,
but one socket is blanked.
The DIN-5-180 connector has only
three connections; a DIN-3-180
plug is normally used.
K2-3
C2 C 2 D2 E 2 E2
F3 F 3 G3 A 3 A3 B 3 B3
C3 C 3 D3 E 3 E3
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
61 × K2-1
K2-2
3 × K2-20-2
M175
K2-10
K2-13
Extensive Mains Power Wires in sheath
F4 F 4 G4 A 4 A4 B 4 B4
C4 C 4 D4 E 4 E4
F5 F 5 G5 A 5 A5 B 5 B5
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
M174
K2-7
designed c.1975–79 ELEX S.p.A. (Excelsior)
drawn 2024 electropict
14
Strings (treble) decay
15
Cello (treble) decay
16
shield
This pin 16 connects to
17
all strings audio
all the shields at this end
of K2-14 and part of
18
+27
K2-110. It is grounded
in the M175 when its
16
connector is in.
16
K2-9
16
Audio signal directions are
marked at terminals with
19
solid pointers:
19
bass pedal audio
Decay control signal
16
directions are marked with
16
empty pointers:
16
shield
20
Cello (treble) audio
16
shield
21
Strings (treble) audio
16
shield
PHB (treble or all) audio
22
Board viewed from
underside.
C5 C 5 D5 E 5 E5
F6
The numbers here are
original but key notes
56
57
58
59
60
61
are added for reference.
strings treble (F3–F6)
64
busbar (+20)
65
PHB Off busbar (–26)
66
PHB On busbar (GND)
61
PH (treble) audio
15
4
6
GND
16
Strings (treble) audio
17
Strings (treble) decay
18
Cello (treble) decay
Cello (treble) audio
19
11
20
GND
21
pitch
13
+13V to pitch trimmer
OS-5
Some K2r3s
(ELEX/Excelsior
branded?) and all
earlier revisions
have a single-pole
power switch
and may have
only one pair of
wires running
to it. (This may
depend on
original national
market.)
Earlier revisions had a different
"Matrix" board in place of the M175,
and mostly different daughterboards.
The K2-20-2 and M174 boards are new in r3.
Advertisement
