16 SSA-424 U
SER
M
ANUAL
4
Appendix
4.1
I
NTERNAL
A
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.
AUX
J4B
J3B
J2B
J1B
J1A
J2A
J3A
J4A
AUX
4 WIRE SYSTEM
4 WIRE SYSTEM
2 WIRE SYSTEM
Telex Communications, Inc., Made in U.S.A.
RTN
+5V
RTN
+15V
-15V
-15V 0.3A
+15V 1.6A
+5V 3A
J5 POWER
Figure 9. Location of screws for disassembly.
RV102
RV101
RV202
RV201
S301
S302
Figure 10. Locations of internal controls.
4.2
M
ODE
D
IP
S
WITCH
S
ETTINGS
S301 controls the operating mode for System B and
S302 controls the operating mode for System A.
Settings are summarized in Table 4
Table 4. Mode DIP Switch Settings
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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
EVEL
D
ISPLAY
C
ALIBRATION
✏
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.
Содержание SSA-424
Страница 4: ...4 SSA 424 USER MANUAL...
Страница 18: ......
