P
UB
.
42004-472C
A
UTO
-D
IAL
T
ELEPHONE
M
ANUAL
Page 14 of 34
P:\Standard IOMs - Current Release\42004 Instr. Manuals\42004-472C.docx
07/16
Figure 13. Cutout for Model 397-001ADFS
External Power for -003AD Models
The plug-in power supply is used for operations below
−
4 ºF (
−
20 ºC) and requires 120 V ac input to
provide a 5 V dc output to the unit. The plug-in power supply is equipped with a 4-foot power cable with
integral connector that plugs into P17 on the telephone PCBA. Remove the jumper from P17 pins 3 and 4
and insert it on the adjacent header J18 when using the plug-in power supply. See Figure 15 on Page 18
for jumper locations.
N
OTE
:
The external power supply provided with these models does not provide telephone line power for
communications. It simply activates a heater circuit to allow operation to
−
40 ºC.
