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Speaker Level
1.
After the Remote Board is set up so that the remote
consoles are transmitting and receiving properly with
the Desk Top Station radio, adjust the intercom levels
on the Remote Interface Board:
a. Adjust R325 for the proper station speaker level
from the remote console microphone.
2.
Replace the Desk Top Assembly cover with the two
(2) screws loosened previously.
INSTALLING THE KEYPAD BOARD
OPTION (MDX ONLY)
1.
Loosen the two (2) captive screws holding the top
cover on the Desk Top Station Assembly. Remove the
cover.
2.
Mount the Keypad Board onto the Interconnect
Board, plugging it in so that P207 and P208 seat di-
rectly on the horizontally oriented pins of J207 and
J208 on the Interconnect Board.
3.
Connect the end of W9 marked "keypad" onto the
keypad pins. Plug the other end onto J401 of the Key-
pad Board. Observe keyed pins of W9.
4.
When remote options are used, connect cable W8 to
P2 of the Remote Board. Connect the other end to
J402 of the Keypad Board. Orient plug at J402 so the
pin with no wire is toward J208.
5.
On Remote Interface Board connect jumpers as fol-
lows:
P303 on J303 pins 2 and 3
P304 on J304 pins 2 and 3
P305 on J305 pins 2 and 3
P306 on J306 pins 2 and 3
P307 on J307 pins 2 and 3
6.
Replace Desk Top Assembly cover with the two (2)
screws loosened in Step 1.
INSTALLING THE CLOCK/VU MODULE
OPTION
1.
Loosen the two (2) captive screws holding the top
cover on the DeskTop Station Assembly. Remove the
cover.
2.
Remove the four (4) screws securing the Front Cap.
3.
Remove the four (4) screws securing the Control
Panel.
4.
Remove P106 from the Power LED, note polarity. On
Control Panel remove P1 of W6 from J1.
5.
Install new 904861G5 or G6 by reversing the order of
steps 1-4.
CLOCK SETTING INSTRUCTIONS
The following separate items may be set: 12/24 hr display
mode, hours, minutes, and display intensity. The time keeping
stops when in any of the set modes. The clock seconds (not
displayed) are set to zero any time a display is altered. Thus, if
setting to the nearest second is desired, the operator must set
the time one minute ahead of the presetn time then wait for the
reference clock to advance to the displayed time before exiting
the set mode. To set the clock:
NOTE
The VU meter bar graphic display is inactive during the
time setting mode.
• Press SW1 approximately 1 sec.
A "12__" or "24__" will display indicating the display
mode. Press SW2 to alternate between modes. When
the correct mode is displayed.
• Press SW1 approximately 1 sec.
The time will display (no flashing colon) with hours
intensified. Press SW2 to advance the hours. Holding
SW2 down will auto increment at about 3 counts per
second. Note the dot in the upper left indicates PM.
When the correct hour is displayed.
• Press SW1 approximately 1 sec.
The time will display with minutes intensified. Press
SW2 to advance the minutes. When the correct min-
utes are displayed.
• Press SW1 approximately 1 sec.
The time will display at the set intensity (no flashing
colon). SW2 changes the intensity. Four intensities
are available. When the correct intensity is displayed
and the reference clock advances to the next minute.
• Press SW1
The colon will now flash and the time keeping contin-
ues.
VU METER TEST/CALIBRATION
TEST
Apply a 1 kHz tone at OVRMS to J101-1 DESK MIC HI
and J101-2 DESK MIC LO. Ground J101-3 DESK MIC
PTT. No LEDs should be lit. Increase 1 kHz tone level. The
LEDs should turn on one at a time. All green/yellow LEDs
should be lit at a level of 100 mV. All red LEDs should be lit
at a level of 175 Mv.
CALIBRATION
The VU meter should have been calibrated at the factory. If
the dot at the lower right hand corner of the display is lit,
then calibration must be performed.
LBI-38977
If the calibration must be changed, a calibration mode is en-
tered by removing power from the unit, then while holding
down SW1, powering the unit. The unit will display a 3 digit
number. Supply a 107 mV 1 kHz signwave to the Desk Mic
Hi input (J101-1 & 2) and ground the Desk Mic PTT input
(J101-3). The bar graph will operate. SW1 will increase the
gain (decrease the displayed number) while SW2 will de-
crease the gain. These switches must be tapped, not held to
set the gain. The range of the displayed number is 80 to 205
with 128 being the default (typical calibration value). In-
crease the gain until one red bar lights, then decrease the
gain until this red light goes out. This is the ideal calibration
point. To exit the calibrate mode and store this calibration
constant and the key, press and hold down SW1 for about 5
seconds. The module will resume normal operation.
3
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