Installation guide

TROUBLE ON SEVERAL TELEPHONES
Light Symptoms
Voice terminal lights are dim, especially when the voice terminal T/P switch is
in the T position (Model 820 only)
B4-3
Voice terminal red and green lights do not flash alternately in test mode
B4-4
Control unit red Warning light flutters and feature catridge is in place
Users cannot place or receive calls
B4-4
B4-1