Jumper settings, Ohm line termination, Level adjustments – GAI-Tronics 10959-908 Rack-Mount Audio Messenger Interfaces User Manual
Page 14: Display brightness, Telephone line levels, Party line levels (model 10959-908 only), Date and time set up, Date set up
Pub. 42004-487A
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ODEL
10959-906
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10959-908
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ACK
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UDIO
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ESSENGER
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Jumper Settings
600-Ohm Line Termination
The unit can terminate the 600-ohm line with 600 ohms for impedance matching. P5 on the termination
board in position 1-2 terminates the line to 600 ohms. P5 in position 2-3 (default) does not terminate the
line.
Level Adjustments
Display Brightness
R237 on the Main PCBA adjusts the brightness of the LCD display on the front of the assembly.
Telephone Line Levels
Two potentiometers located on the Telephone Interface PCBA adjust the input and output audio levels.
The Receiver Volume potentiometer, R36, adjusts the audio level from the telephone line. The Transmit
Volume Potentiometer, R1, adjusts the audio level to the telephone line.
Party Line Levels (Model 10959-908 Only)
Two potentiometers located on the Page/Party
®
Interface PCBA adjust party line audio levels. The Party
Volume potentiometer, R66, adjusts the audio level to the party line. The Party Sidetone Potentiometer,
R30, adjusts the sidetone level from the party line.
Page Line Levels (Model 10959-908 Only)
Two potentiometers located on the Page/Party
®
Interface PCBA adjust page line audio levels. The Page
Volume potentiometer, R39, adjusts the audio level to the page line. The Page Monitor Potentiometer,
R69, adjusts the monitor level of audio activity from the page line.
Date and Time Set Up
Date Set Up
Push buttons on the top edge of the Main PCBA of the unit allows for date set up. Complete the
following procedure to set the date. Refer to Figure 5 for the locations of the push buttons on the Main
PCBA.
• Press
• Press