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Pub. 42004-615L2
Model 670-801-EX and 670-801-UL SmartSeries Amplifiers Page: 9 of 15
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NOTE: If acoustical feedback occurs between the speaker associated with the amplifier and the handset
on a nearby station, the speaker can be muted by moving the violet wire on the enclosure on TB1 to
terminal 7.
Figure 7. Wiring Detail