Clear KB-702 User Manual download pdf (Page 19)

KB-702/KB-702GM TWO-CHANNEL SPEAKER STATIONS

3-3

TROUBLESHOOTING

SYMPTOM CAUSE SOLUTION

System does not operate. Ta l k

button does not light.

No intercom connection to the

KB-702. If the EB7-4W four-wire

option module is connected, the

KB-702 may not be receiving AC

power.

Check connections and cable.

The KB-702 has an internal failure. Unit requires servicing.

Speaker does not operate. Ta l k

button lights amber when

pressed.

Speaker switch turned off, volume

knob turned all the way down, or

channel switch set to unused channel.

Adjust controls appropriately.

Speaker plug or wiring has come loose. Make sure speaker is connected

internally.

Plug P3 missing on circuit board. Plug P3 must be installed in jack J3 if

the EB-TW or EB7-4W options are

not used.

Hum or buzz in system Inductive pickup caused by close

proximity of this speaker station or

connected stations to power lines or

transformers.

Relocate the offending unit or wiring.

If the cable run is exceptionally long,

consider adding and using the

EB7-4W four-wire option module.

(Requires an additional four-wire

interface at the opposite end of the

“long run.”)

System feedback (Acoustical) Intercom level control at this station or

another station is set too high.

Adjust.

Sidetone null control at this station or

another station is not adjusted

correctly.

Adjust. Refer to the chapter

“Operation.”

Channel not terminated. Set the main station or power supply

termination switch for that channel to

the on position.

Channel switch set to an unconnected

channel.

If only one intercom line is connected,

set option switch #1 to the on or closed

position to link both channel switch

positions to the same intercom line.

A headset extension cord was used. Headset extension cords are not

recommended.

VOX problems (KB-702GM

only)

Stays tripped (amber light on).

Sensitivity set too high.

Tu r n VOX sensitivity control in a

counter-clockwise direction.

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Clear KB-702 User Manual Page 19

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