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Turn the tone off by typing the following
commands. The first command will turn it off:
<F2>
<F2>
<F2>
Successful completion of this tests verifies basic
operation of the following:
•
Line A input circuitry
•
Speaker A power amplifier circuitry
•
PC and Logic Board's ability to control the cross-
point audio matrix switches on the Audio Matrix
Board
•
Volume Controller Box select volume control and
its related cabling
•
VU meter circuitry
2.
Send LINE B Input Audio to SPEAKER B
Remove the RJ-11 modular plug from the LINE A
jack and connect it to the LINE B balanced input.
The balanced input is the two outside contacts on
the RJ-11 modular jack (yellow and black wires in
a modular cable).
Verify the 1 kHz tone is heard in Speaker B. If not,
send the LINE B input to the SPKR B output by
typing the following command:
<F2>
Adjust the unselect speaker (Speaker B) volume
knob up and down and verify the volume changes.
Turn the tone off by typing the following
command:
<F2>
Successful completion of this tests verifies basic
operation of the following:
•
Line B input circuitry
•
Speaker B power amplifier circuitry
•
PC and Logic Board's ability to control the cross-
point audio matrix switches on the Audio Matrix
Board
•
Volume Controller Box unselect volume control
and its related cabling
6770
<Enter>
7770
<Enter>
8730
<Enter>
6641
<Enter>
6640
<Enter>
Send Mic Audio To LINE A & LINE B Outputs
3.
If necessary, connect a headset to operator headset
jack box. Verify this jack box is connected to the
OPERATOR HEADSET connector on the Audio
Matrix Board (#1).
Terminate the Audio PA Board's (#1) LINE A
balanced output terminals with a 600-ohm resistor.
The balanced output is the two center-most
contacts on the RJ-11 modular jack (red and green
wires in a modular cable). Connect an oscilloscope
across this load resistor.
Send operator headset mic audio to the LINE A
output by typing the following commands:
<F2>
<F2>
Speak into the headset's mic and verify the audio
signal is present on the LINE A balanced output.
Maximum signal level is approximately 6 Vp-p.
Turn the operator headset mic-to-LINE A audio off
by typing the following command:
<F2>
Verify mic audio is no longer on the LINE A
balanced output.
Move the LINE A balanced output 600-ohm
termination to the LINE B balanced output.
Send operator headset mic audio to the LINE B
output by typing the following command:
<F2>
Speak into the headset's mic and verify the audio
signal is now present on the LINE B balanced
output. Maximum signal level is approximately 6
Vp-p.
Turn the operator headset mic-to-LINE B audio off
by typing the following commands. The audio
should turn off after the first command is entered:
<F2>
<F2>
Verify mic audio is no longer on the LINE B
balanced output.
Successful completion of this tests verifies basic
operation of the following:
•
operator headset mic input circuitry
•
Line A and B output circuitry
LBI-39055
6331
<Enter>
1001
<Enter>
1000
<Enter>
2001
<Enter>
6330
<Enter>
2000
<Enter>
23
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