AT&T Merlin 820 Service And Maintenance Manual page 73

Trouble on More Than One Voice Terminal
Figure 35—Reconnecting Modular Terminal Cords
Place the control unit On/Off switch in the On position. If an auxiliary
Step 8.
power unit is used, plug it back into the ac outlet.
Using the voice terminals of the two lines just connected to the Voice
Step 9.
Terminals jacks (the voice terminals' intercom number will match the
Voice Terminals jack numbers), perform the action that revealed the
trouble.
The trouble appears on the voice
terminal that at first had no trou-
ble,
The trouble appears on the voice
terminal that it first appeared,
Step 10. Place the control unit On/Off switch in the Off position. If an auxiliary
power unit is used, unplug it from the ac outlet.
Page 70
Voice
Terminals
er
10
11
Normal
Area Code
12
Pulse
13
14
IF
20
15
21
16
22
17
23
18
24
19
THEN
Trouble found. It is caused by
the expansion module connected to
this voice terminal.
Go on to Step 10.
Trouble found. It is caused by
the control unit.
Go on to Step 10.