Codan Radio MT-4E Paging - Manual (Page 32)

USER GUIDE | MT-4E PAGING SYSTEMS
Chapter 3: MT-4E Paging System Components Page 24
Power Input
The main power input (+10 to +17 Vdc; +13.8 Vdc nominal) connector is located at the back of the
subrack, on the motherboard. There is an identical +9.5 Vdc power output connector on the motherboard
that is used to power other Codan equipment at +9.5 Vdc (the CI-RC-4M-G2 controller for example).
NOTE: Do not connect the main power input to the +9.5 Vdc power output connector, as a transient
suppressor (over voltage protection) will short to ground to protect the equipment.
Reverse voltage protection and over voltage protection (transient suppressor) is provided at the main
power input as well as the +9.5 Vdc line. The main power input is protected with a standard fast-blow
15 amp fuse. These components may require replacing if the power supply is not connected properly,
or even after a power surge or a lightning strike. The two transient suppressors have different voltage
ratings for the main power input and +9.5 Vdc lines. Figure 3-16 shows the subrack / motherboard rear
view.
Figure 3-16: Subrack / Motherboard Rear View
A SIDE
BANK AND CHANNEL
SELECT JUMPERS
B SIDE
BANK AND CHANNEL
SELECT JUMPERS
POWER INPUT
+10 to +17 Vdc
+13.8 Vdc NOMINAL
15 AMP FAST
BLOW FUSE
(5604-5GAGC150)
+13.8 Vdc LINE
TRANSIENT SUPPRESSOR
(2007-1N637800) &
REVERSE VOLTAGE DIODE
(2001-MR751000)
+9.5 Vdc LINE
TRANSIENT SUPPRESSOR
(2007-1N637500) &
REVERSE VOLTAGE DIODE
(2001-MR751000)
+9.5 Vdc REGULATED
POWER INPUT /
OUTPUT
(NOT TYPICALLY USED)
CHANNEL SELECT
PULL-UP OR EXTERNAL
CONTROL JUMPERS
AUXILIARY
CONNECTORS
CHANNEL SELECT
PULL-UP OR
EXTERNAL
CONTROL
JUMPERS