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Identification
LED Indications
• Low Battery: Low Battery LED flashes red.
• Off-Hook Mode: Mode LED flashes red.
• Monitor Mode: Mode LED flashes green.
• On-Hook Mode: No LEDs are illuminated.
Hazard Indication
A constant ringing may indicate a hazard — excessive AC voltage on the line. If you hear this
alarm, remove the test set from the line carefully and immediately.
Low Battery
Polarity LED
+ –
PULSE
FLASH
SPKR
LNR/PAUSE
MEM
STO
1
2
ABC
4
5
GHI
JKL
7
8
PQRS
TUV
0
TONE
TALK
MONITOR
MUTE
45053 • 45054
Mode LED
VOL
POL
3
DEF
6
MNO
9
WZYZ
#
5