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4
Appendix
4.1
I
A
NTERNAL
CCESS
1 Remove six screws from the back cover.
2 Remove the top cover.
This provides access to all internal adjustments.
3 For option card installation, slide the circuit board
out toward the back to remove it from the bottom
cover.
Telex Communications, Inc., Made in U.S.A.
AUX
J4B
J1B
J3B
J2B
2 WIRE SYSTEM
4 WIRE SYSTEM
Figure 9. Location of screws for disassembly.
RV202
Figure 10. Locations of internal controls.
4.2
M
D
S
ODE
IP
WITCH
S301 controls the operating mode for System B and
S302 controls the operating mode for System A.
Settings are summarized in Table 4
16 SSA-424 U
M
SER
ANUAL
AUX
J5 POWER
+5V 3A
+15V 1.6A
-15V 0.3A
J4A
+5V
RTN
+15V
-15V
J1A
J3A
RTN
J2A
4 WIRE SYSTEM
RV201
S301
S302
RV102
RV101
S
ETTINGS
Table 4. Mode DIP Switch Settings
S
S
S
S
S
i w
i w
i w
i w
i w
c t
c t
c t
c t
c t
h
h
h
h
h
S
S
S
S
S
e
e
e
e
e
t t
t t
t t
t t
t t
n i
n i
n i
n i
n i
g
g
g
g
g
s
s
s
s
s
1 1 1 1 1
2 2 2 2 2
3 3 3 3 3
4 4 4 4 4
C
d (
A
O
f f
O
f f
O
f f
O
f f
U
a
m
a
c
C
S
s
e
i w
9
0
O
n
O
f f
O
f f
O
f f
h
e
n
o
c
o
h t
i s
c
o
C
S
O
n
O
f f
O
f f
O
n
e
n
u
n
C
O
f f
O
f f
O
n
O
f f
i S
s
e
Half-duplex Definition: Only one side of the line
can talk at a time and the other side must wait until
the first side is done talking before responding.
Full-duplex Definition: Both sides of the line can
talk simultaneously.
4.3
L
D
EVEL
ISPLAY
This is a factory preset adjustment and
should not require readjustment.
1 On the front panel, set the 4W LEVEL REF SEL
controls to -10dB.
2 Set the 2W CHAN SEL switches to 1.
3 Input a 1kHz, -10dBu test signal at J1A (System
A) or J1B (System B). (Pin 1, signal common;
pin 2, signal high.)
4 Adjust RV101 (System A) or RV201 (System B)
while watching the top display (TO4W). All of the
green displays should be lit and no amber
displays should be lit.
5 Remove the test signal.
D
D
D
D
D
e
e
e
e
e
s
s
s
s
s
c
c
c
c
c
i r
i r
i r
i r
i r
t p
t p
t p
t p
t p
o i
o i
o i
o i
o i
n
n
n
n
n
o
f n
g i
r u
t a
o i
n
, 1
H
a
f l
F /
l l u
D
u
l p
x e
M
o
e
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l u
: ) t
u
o t
m
a
c i t
a
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s
w
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h
e
s
b
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e
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n
m
o
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s
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l u
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u t
t a
o i
n
s
w
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e
e r
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e
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h
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n
o
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s l
o
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w
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e
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o
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s
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o
f n
g i
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t a
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, 2
S
w
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h
e
d
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l l u
D
u
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x e
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h
e
s
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a
t f
r e
c
o
n
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t a
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n
b
e
g
n i
s
o
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n i l
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S
a t
s y
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f
l l u
d
u
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m
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e
u
s
e
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o
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a
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n
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p
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, n
w
h
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m
t t i
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n
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s r
t a
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n
w
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n
p
e
o
p
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a
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k l
n i
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e
r p
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e r
d
o
p
r e
t a
n i
g
m
o
d
e
f
r o
m
a
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t a
o i
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, s
a
n
d
p
r a
c i t
l u
r a
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f
r o
a f
s
, t
c
o l
o
d r
n i
t a
o i
, n
e t
a
m
o
p
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t a
o i
n
. s
o
f n
g i
r u
t a
o i
n
, 3
L
o
c
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d
F
l l u
D
u
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a
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e
a
s
c
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g i
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t a
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b
t u
o
n
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a
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d -
u
l p
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m
o
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t i
s
a t
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h t
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p
o
w
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o
w
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f n
g i
r u
t a
o i
n
, 4
H
a
f l
F /
l l u
D
u
l p
x e
M
o
d
m
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r a
o t
c
o
f n
g i
r u
t a
o i
n
, 1
b
t u
i w
h t
h
g i
n
t i s
i v i
. y t
C
ALIBRATION
d
e
e
. s
h
e r
s i
M
o
d
: e
x e
3
9 -
h t
e
- 4
n
l i t
6
- 0
. s
T
h
s i
d r
o i
d
s
f o
r u
l a
T
h
s i
s i
y n
s
- e
M
o
d
: e
y h
r b
d i
t a
m
o
d
e
: e
h
r e
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