Table of Contents
Advertisement
7-4
SYMPTOM
Erratic operation:
LCD Display and
LEDs
Faint data noise
during background
conversation
SYMPTOM
Other party cannot
hear you. (handset)
Table 7-3: Erratic Key Telephone Operation
DIAGNOSTIC AID
Digital Volt/OHM
Cable distance is too
meter
long for gauge of
cable used.
Non-standard
telephone cable
being used or
multiple digital
stations fed from
one common cable.
Table 7-4: Key Telephone (cannot be heard)
DIAGNOSTIC AID
Key Telephone
Component failure
(other station)
CAUSE
If a key telephone is not receiving clear
2B+D signal from KSU, test as follows:
Test cable with a known good keyset.
Check wiring, cables, and connectors.
Replace card.
Check AC voltage.
CAUSE
1. Verify MUTE Btn LED is not lit.
2 Lift handset, dial another station. Talk.
3 Replace handset assembly and repeat
Step 1.
4 Replace handset cord and repeat
Step 1.
5 If still no transmit, the key telephone
will need to be replaced.
CPU/Power LED
CORRECTIVE ACTION
CORRECTIVE ACTION
Advertisement
Table of Contents
