~23~
To make the execution of the procedure possible, all connected uniphones must be operational and correctly
connected. The idle voltage of the uniphone line should be in the range of 9-10V DC. The ringing volume slider is set
to the maximum volume (up).
After connecting the uniphone to L + and L- cables, wait 30 seconds for determining the voltage levels. To run the test
procedure from the uniphone level:
Pick up the handset
Press the opening button once and wait for a moment (the control electronics are looking for the uniphone with
the handset removed)
When your handset is found, the electronics sends a call signal (the handset is still removed)
Put the handset back and wait for a while
The telephone will start ringing
Pick up the handset and check if the sound comes from the panel to the loudspeaker of the handset, if there is
no acoustic feedback or if it is possible to open the electric strike.
After putting on the handset, the test cycle for the given telephone ends
This is the way the other uniphones should be tested, by removing the handset, pressing the opening button, etc.
ATTENTION: The time required to scan the whole line of 255 uniphones is about 5 minutes, which is why it is
recommended to narrow the search ranges to, for example, 20 uniphones, which will significantly shorten the search
range. The program scans physical addresses, not subscribers' numbers.
7.4. Searching for short circuits
All uniphones are connected to the CC-4000 control electronics via a two-wire bus. In the event of damage to any of
the uniphones, especially after the atmospheric discharges, the entire system is disrupted. In most cases, this
prevents the correct operation of the remaining uniphones in the whole L + L- bus.
The subprogram of the program allows you to easily find incorrectly operating handsets.
When it is running, a variable frequency call signal is sent to the uniphone line without addressing. The effect is that
all uniphones that are damaged (in a way that loads the line, e.g.: key short circuit) will be ringing.
During the procedure the panel remains blocked, connections cannot be made. Pressing any key activates the main
electromagnetic lock at the programmed time. Pressing the key five times discontinues the installation procedure
and restarts the panel.
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