Ericsson LBI-39055 manual Send Line B Input Audio to Speaker B

LBI-39055

❏Send the LINE A input to the SPKR A output by typing the following commands:

<F2> 6771 <Enter>

<F2> 7771 <Enter>

<F2> 8731 <Enter>

NOTE

If no headset is connected to the Audio Tower the initial audio matrix switch settings will route the LINE A input to the SPKR A output. Therefore, in this case, execution of the above commands is not necessary.

❏Verify the 1 kHz tone is heard in Speaker A. CTEST's VU meter should indicate yellow.

❏Adjust the select speaker (Speaker A) volume knob up and down and verify the volume changes. This knob is the left-most volume knob on the Volume Controller Box.

❏ Turn the tone	off	by typing the following
commands. The first command will turn it off:
<F2>	6770	<Enter>
<F2>	7770	<Enter>
<F2>	8730	<Enter>

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> 6641 <Enter>

❏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>	6640	<Enter>

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

3.Send Mic Audio To LINE A & LINE B Outputs

❏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> 6331 <Enter>

<F2> 1001 <Enter>

❏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> 1000 <Enter>

❏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.

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