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7835C Initial Power-Up Sequence
Before connecting power, check that the following have been completed:
Y
16.5VAC / 40VA transformer connected to terminal block positions 1 & 2
Y
P2 in the correct position for zone 1 & 2 trigger levels (zone mode only)
Y
P3 in the correct position for zone or ECP operation
Y
Antenna installed
Apply power by plugging in the 16.5VAC / 40VA transformer. If using the optional battery, plug it into
the battery jack. Initially, all 7835C programming options are set to the factory default settings.
Some 7720BT batteries may have cables that are too short for installation in the normal configuration.
With the 7720BT battery label facing you and the battery notch in the lower right corner, the cable
may not reach the connector on the 7835C or might be pulled tight when the battery is seated in the
battery compartment. In this case, install the 7720BT with the label facing the back of the
compartment and the notch in the upper right hand corner. Note that the battery will not sit squarely
in the battery compartment if this action is taken when using plastic base part number N8921V1. This
will not effect battery backup operation.
Upon applying power, the 7835C enters the power-on reset mode, indicated by all 8 LEDs being solidly lit
for approximately 5 seconds followed by the RSSI bar graph green LEDs lighting in a "chaser" sequence
from left to right. After this power-up sequence, the Radio Status LEDs display solid green, blinking
yellow, and solid red.
This indicates the 7835C is functioning but not yet initialized. The 7835C then begins its initialization
sequence. During this process, the 7835C is verifying its Mobile Identification Number (MIN) and
checking for MicroBurst service on both the "A" and "B" side carriers. This initialization is displayed on
the RSSI bar graph as follows (refer to Table 1): The yellow LED will remain unlit and the green LED at
the extreme right of the display will begin to blink. This green LED then lights solid (after a short period
of time), and the next green LED to the left begins to blink. When this LED lights solid, the next green
LED begins to blink, and so on, until all 4 green LEDs are lit solid. This countdown event may take up to
10 minutes to complete.
Once this sequence has been completed, the RSSI display begins to function as a signal strength indicator
as described in Selecting a Radio Installation Site section. The radio is now in normal, unprogrammed and
unregistered operation. If radio setup and self-test fails, LED 5 will blink continuously and no further
progress will be made. If MicroBurst coverage is not found on either the A or the B side, the 7835C will
repeat steps 2 and 3. These steps will be repeated until MicroBurst is found.
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