DoorKing 1833 PC Programmable - Manual (Page 49)

1835-065-E-7-13 47
This adjustment is only on the 1834/1835 wall mounts and all the 1837 models. This is adjusted at the
factory and should NOT be adjusted in the field.
4.4 Backlite Cutoff
3 2 1
BACKLITE
CUTOFF
4.1 Speaker Volume, Microphone and Feedback
Speaker volume, microphone volume and feedback all interact with each other to affect the audio performance of the system.
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 telephone entry system to a resident. If feedback occurs, turn the speaker volume
counter-clockwise until it ceases.
5. While the tenant is still on the line, ask them to remain silent while rubbing your finger over the microphone
hole on the face plate. 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.
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
3 2 1
FEED
BACK
3 2 1
3 2 1
SPK
VOL
4.2 Click Sensitivity - Use for Rotary-Dial Phones ONLY
1. Locate the click sensitivity adjustment on circuit board (see previous page).
2. If rotary dial phones are NOT used, set the click sensitivity to FULL counter-clockwise to disable this feature. If
rotary dial phones are in use, proceed to step 3.
3. Place a phone call from the telephone entry system to a resident with a rotary dial type phone. After they
answer, ask the resident to dial 9 while you adjust the click sensitivity potentiometer (the resident may have to
dial 9 several times for you to obtain the correct adjustment). When the door or gate opens, this is the correct
adjustment for the click sensitivity.
4. Note: Adjusting the click sensitivity too high (potentiometer fully clockwise) could cause the system to respond
to loud noises while it is in use. If this happens, rotate the click sensitivity potentiometer counter clockwise 1/8
turn and re-test the system. You may have to perform this step several times to find the correct adjustment.
CLK
SEN
LCD display is adjusted at the factory and should NOT need to be re-adjusted. If it does, Let the system run for at
least 10-minutes before making any display contrast adjustments.
4.3 LCD Display Contrast - 1834, 1835 and 1837
1. Locate the contrast adjustment on your chosen model (see previous page).
2. Turn the contrast potentiometer clockwise to lighten, counter-clockwise to darken until the display is satisfactory.
CONTRAST
or
3 1
CONTRAST
3 1