User manual

Clear-Com Intercom Systems KB-211/KB-211GM Two-Channel Speaker Stations

Rev. A

Scenario 2

The KB-211 has an internal failure.

Solution: Unit requires servicing.

•

Speaker does not operate, but the Talk Light comes on when Talk

button is pressed

Scenario 1

The Speaker switch is turned off, the volume knob is turned all the way down,

or the channel switch is set to the unused channel.

Solution: Adjust controls appropriately.

Scenario 2

The speaker plug or wiring has come loose.

Solution 2: Make sure speaker is connected internally.

Scenario 3

Plug P3 is missing on circuit board.

Solution: Plug P3 must be installed in J3 jack if the EB-TW or EB-4W options

are not used.

• Hum or buzz in the system.

Scenario 1

Inductive pickup caused by close proximity of this speaker station or

connected stations to power lines or transformers.

Solution: Relocate the offending unit or wiring. If the cable run is exceptionally

long, consider adding and using the EB-4W 4-Wire Option Module. (Requires

an additional 4-wire interface at the opposite end of the “long run.”)

• System feedback (Acoustical).

Scenario 1

Intercom Level control at this station or another station is set too high.

Solution: Adjust.

Scenario 2

The Sidetone control at this station or another station is not correctly adjusted.

Solution: Adjust. Refer to “5—Sidetone Control” on page 4.

Scenario 3

Channel not terminated.

Solution: Set the Main Station or Power Supply termination switch for that

channel to the ON position.

Scenario 4

The Channel switch set to an unconnected channel.