Copyright
2004 Comtech EFData
–1– an/PSREPLACE.DOC
8/5/04
Application Note
Modem Power Supply
Replacement Procedure for
CDM-600 & CDM-550/550T
IMPORTANT
This document applies to the CDM-600 and CDM-550/550T modems only. Contact Comtech EF Data
Customer Support for additional information.
P
P
o
o
w
w
e
e
r
r
S
S
u
u
p
p
p
p
l
l
y
y
T
T
o
o
o
o
l
l
s
s
N
N
e
e
e
e
d
d
e
e
d
d
Tools
1 #2 Phillips Screwdriver
2 Soldering
Iron
3 Solder
4 Tweezers
5 Grounding
strap
P
P
a
a
r
r
t
t
s
s
R
R
e
e
q
q
u
u
i
i
r
r
e
e
d
d
PARTS
Power Supply Assembly
PL/9971-1, Rev. D
3mm mounting screws (2 each)
HW/M3X4FHP
4-40 ground screw
HW/SEM440X1/4PH
100
µ
F surface-mount capacitor
(for CDM-600 only)
CP/SMTANT10V107
10
Ω
surface-mount resistor
(for CDM-600 only)
RS/121001
M
M
o
o
d
d
e
e
m
m
P
P
o
o
w
w
e
e
r
r
S
S
u
u
p
p
p
p
l
l
y
y
R
R
e
e
p
p
l
l
a
a
c
c
e
e
m
m
e
e
n
n
t
t
P
P
r
r
o
o
c
c
e
e
d
d
u
u
r
r
e
e
f
f
o
o
r
r
C
C
D
D
M
M
-
-
6
6
0
0
0
0
Step
Procedure
1
Remove power to the modem. Remove all cables from the rear of the modem.
CAUTION
Remove all power from unit before proceeding. High Current AC and DC are present inside. Failure to
remove all power may cause serious injury. Use proper ESD measures.
2
Remove the machine screws located on top and remove the cover from the chassis.
