40
1838-065 Issued 3-19
Version D
4.3 Relay 2 Jumper
This jumper sets the contacts on relay number TWO at either Normally Open (NO) or Normally Closed (NC). The jumper is set
to NO from the factory.
4.4 Speaker Volume, Microphone and Feedback
Speaker, microphone and feedback ONLY need to be adjusted when a DKS Remote Call Station is connected to the 1838.
Speaker volume, microphone volume and feedback all interact with each other to affect the audio performance.
1.
Locate the speaker volume, microphone volume and feedback adjustments on circuit board (see previous page).
2. Set the speaker volume about 1/3 from full counter-clockwise.
3. Set the microphone volume to 1/2.
4. Place a phone call from the remote call station to a resident. If feedback occurs, turn the speaker volume
counter-clockwise until it ceases.
5. While the resident is still on the line, ask them to remain silent. Locate and move the feedback tone ON/OFF
jumper to to the ON position
(see previous page).
A tone will now be heard in the speaker. Rotate the feedback
adjustment throughout its range while listening to the sound coming from the speaker. When the sound is
minimum, this is the correct setting. Move the feedback tone ON/OFF jumper back to to the OFF position.
6. Speaker volume and microphone volume may now be adjusted to desired levels. If both are set too loud,
feedback may result. For louder speaker volume, the microphone volume may need to be decreased. For louder
microphone volume, the speaker volume may need to be decreased.
7. Normal setting for both speaker volume and microphone volume is about 1/2.
8. After setting these adjustments, place some test calls. If feedback occurs, microphone and/or speaker volume
will need to be reduced.
MIC
VOL
321
FEED
BACK
321
321
SPK
VOL
TONE ON
TONE OFF
16AC16ACBAT1NO1NC1C
2RY2C
AZIMC
5VDCIMDSPKRCOMMICPSWCGNDPHONE
Main Terminal
Relay 2 Connection
Com
Contact – 30 Volt, 3 Amp max.
NC
NO
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