Table of Contents
Advertisement
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-424A 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
O
p
e
n
O
p
e
n
O
p
e
n
O
p
e
n
C
o l
e s
d
O
p
e
n
O
p
e
n
O
p
e
n
C
o l
e s
d
O
p
e
n
O
p
e
n
C
o l
e s
d
O
p
e
n
O
p
e
n
C
o l
e s
d
O
p
e
n
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
c s
c s
c s
c s
c s
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
C
o
n
g i f
u
a r
o i t
n
, 1
H
f l a
F /
l l u
D
u
l p
x e
M
o
d
d (
e
a f
l u
: ) t
A
u
o t
m
i t a
a c
y l l
s
w
t i
h c
s e
b
e
w t
e
e
n
m
o
d
U
e s
l u f
n i
s
u t i
a
o i t
s n
w
h
e
e r
h t
e
e r
s i
h
g i
a
m
b
e i
t n
n
o
s i
. e
l A
o s
u
e s
l u f
w
h
e
n
h t
e
a
o c
s u
c i t
e f
e
d
b
c a
. k
C
o
n
g i f
u
a r
o i t
n
, 2
S
w
t i
h c
e
d
F
l l u
D
u
l p
x e
S
w
t i
h c
e
f s
o r
m
h
f l a
d
u
l p
x e
o t
l u f
d l
u
l p
e s
o c
n
s d
a
t f
r e
o c
v n
r e
a s
o i t
n
b
e
i g
s n
o
n
i w
e r
n i l
. e
S
a t
s y
n i
l u f
d l
u
l p
x e
m
o
d
e
u
9
0
e s
o c
n
s d
a
t f
r e
o c
v n
r e
a s
o i t
n
e c
a
e s
h
l e
s p
o t
e k
e
p
h t
e
n i l
e
q
u
t e i
d
r u
n i
g
p
e
n
o
o c
v n
r e
a s
o i t
, n
w
h
e l i
p
r e
m
t i
n i t
g
n
t a
o c
v n
r e
a s
o i t
n
w
h
e
n
p
e
o
p
e l
a
e r
a t
k l
n i
. g
h t
e
r p
f e
r e
e r
d
o
p
e
a r
n i t
g
m
o
d
e
f
r o
m
a
y n
s
u t i
a
o i t
n
, s
a
n
d
p
a
i t r
u c
a l
l r
f y
r o
a f
, t s
l c
o c
o
d r
n i
a
o i t
, n
e t
a
m
o
p
e
a r
o i t
n
. s
C
o
n
g i f
u
a r
o i t
n
, 3
L
c o
e k
d
F
l l u
D
u
l p
x e
S
a
m
e
s a
o c
n
g i f
u
a r
o i t
n
, 2
b
t u
o
n
e c
a
e
t n
r e
f s
l l u
d -
u
l p
x e
m
o
d
e
i ,
s t
a t
s y
n i
h t
u
i t n
p l
o
w
r e
d -
o
w
. n
C
o
n
g i f
u
a r
o i t
n
, 4
H
f l a
F /
l l u
D
u
l p
x e
M
o
d
S
m i
l i
r a
o t
o c
n
g i f
u
a r
o i t
n
, 1
b
t u
w
h t i
h
g i
e s
n
t i s
i v i
. y t
C
ALIBRATION
e
e
. s
h
e r
s i
M
o
d
: e
x e
3
9 -
h t
e
- 4
i t n
6 l
- 0
. s
T
h
s i
d r
o i
s d
f o
r u
l a
T
h
s i
s i
s o
- e
M
o
d
: e
y h
r b
d i
t a
m
o
d
e
: e
h
r e
Advertisement
Table of Contents
