NOTAS / NOTES
78
TROUBLESHOOTING HINTS
An easy way to check that the system is working properly, is to disconnect the wiring and test a
terminal (telephone) directly connected to the door panel installation.
Any short-circuit between different terminals of the system will not damage the connected units.
O Nothing operates.
w Remember that once the power supply is plug in, the system remains inactive for 45 sec,
likewise when connecting any other unit into the installation.
w Check the output power supply voltage between ' ' and '+' is among 17,5 to 18,5Vd.c.
Otherwise, disconnect the power supply from the installation and measure again. If its
correct now, it means there is a short circuit in the installation. Disconnect the power supply
from the mains and check the installation.
w If the previous tests are correct, check the self-testing leds (see page 63).
O Inappropriate audio level.
w Adjust the level volumes as shown on page 64. In case of audio feedback, reduce the volume
until it disappears. If audio feedback disappears only with the adjustments at minimum
positions there could be another problem.
O Persistent audio feedback.
O The door opening function no operates.
w Remember this function is only active during the call and communication processes.
w Short-circuit 'CV1' and 'CV2' terminals of the EL620/2Plus sound module; then, there must be
12V (a.c. or d.c. depending on the kind of installed lock release) among the lock release
terminals. If so, check the lock release state.
O The system can't be programmed.
w Check the switch number 2 of the configuration dip switch is set to ON (see page 63) and that
the programming sequence is correct (see page 69).
w Check on the EL 620/2Plus sound module the self-testing leds (see page 63).
O Some units do not receive calls.
w Remember there must be only one master unit in each apartment. Check the terminal is
programmed appropriately, and if necessary, repeat the programming steps.
O Push buttons do not work.
w When pressing the push button, check the door panel emits a confirmation tone; otherwise,
check the push buttons wiring (page 61-62).
w If there is confirmation, check the telephones programming (page 69).
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w Check the BUS is not shortcircuited with another terminal or itself.
77
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