Installation guide

TROUBLE ON SEVERAL TELEPHONES
Entire System Down
Symptom:
Entire system is down. Red and green lights on control unit are not lit. System is
totally inoperative.
Possible Cause
Recommended Action
1. There is no ac power.
1.
Make sure the control unit is not connected to
an outlet controlled by a switch. Check the
connections between the contol unit, an
Auxiliary Power Unit (may be present with
Model 820), and the ac outlet.
AC power hookup
2.
Outlet is defective.
2.
Plug in a lamp or radio to test the outlet.
3. Control unit is defective. 3.
If the system is still down, replace the control
unit.
B7-3