Valcom V-1921, Руководство пользователя

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Out
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Control
(Tip/A)
(Ring/B)
(-24VDC)
(Gnd)
Valcom -24VDC
Power Supply
One-Way
Amplified
Speaker
FIGURE 1: TYPICAL CONNECTIONS
NOTE: Do not connect this speaker directly to a
25/70/100 Volt amplifier as damage to both the
amplifier and speaker may occur.
A V-1095 may be used to allow the use of
Valcom self-amplified speakers on 70V speaker
lines.
TROUBLESHOOTING CHART
SYMPTOMS ACTIONS
1. No audio from speaker 1a. Check that volume control is turned up (Clockwise).
1b. Using a lineman's test set, check for the proper audio level on the
Tip and Ring leads and if necessary also at the source.
2. Low volume from speaker 2a. Check that volume control is turned up.
2b. Check voltage at the speaker assembly when in use, -18 to
-24VDC required.
2c. Using a lineman's test set, check for the proper audio level on Tip
and Ring leads. It is possible that some low-level audio will be
heard with only one side of Tip and Ring connected.
3. Loud squeal (Feedback) 3a. Turn down (Counter-clockwise) volume of the speaker.
3b. Increase the distance between the telephone and speaker.
3c. Install a noise canceling handset on the telephone in severe
problem areas.
3d. Add a V-9964, Digital Feedback Eliminator.