Comtech EF Data CDM-600 Installation and operating instructions

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
Po ow we er r S Su up pp pl ly y T To oo ol ls s N Ne ee ed de ed d
Tools
1 #2 Phillips Screwdriver
2 Soldering Iron
3 Solder
4 Tweezers
5 Grounding strap
P
Pa ar rt ts s R Re eq qu ui ir re ed 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 µF surface-mount capacitor (for CDM-600 only) CP/SMTANT10V107
10Ωsurface-mount resistor (for CDM-600 only) RS/121001
M
Mo od de em m P Po ow we er r S Su up pp pl ly y R Re ep pl la ac ce em me en nt t P Pr ro oc ce ed du ur re e f fo or r C CD DM M- -6 60 00 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.

Copyright 2004 Comtech EFData Corp. –2– an/PSREPLACE.DOC 8/26/044
Step Procedure
3 Locate the old power supply (may be Shindengen FYX600/61G or PL/9971-1, Revision A, B, or C). Remove both AC
input and DC output connectors, and ground wire from the old power supply.
4 Remove and discard the two machine screws that secure the shield bracket (from underneath the modem) to the
chassis. Remove and discard the bracket from the modem.
5 Remove and discard the two machine screws that secure the power supply (from underneath the modem) to the
chassis and then remove the old power supply.
CAUTION
Do not apply power to the supply without proper loading (0.2A min.) or connection to the modem. Failure to
follow this direction may cause damage to the modem when connected to the supply.
6 Place the new power supply assembly (PL/9971-1, Revision D) in the modem and secure it using the two new
shorter screws (HW/M3X4FHP).
CAUTION
Use only the supplied screws for attaching the power supply to the modem. Incorrect screws may cause
damage to the power supply.
7 Connect the ground wire to the power supply by using the screw in the location near the ground spade on the power
supply. See Figure 1.
8 Connect the AC input and DC output connectors to the power supply.
CAUTION
Connectors must be correctly aligned and fully seated onto board and power supply.
9 Locate the capacitor at C485 and inductor at L94 on the PL/0424 IF modem card. See Figure 2.
10
Replace the existing capacitor with the new 100 µF part and the inductor with the new 10 Ωresistor.
CAUTION
Check for proper polarity orientation when installing the capacitor.
11 Re-install the cover to the chassis and secure it using the attaching screws.
12 Apply power to the unit and verify that the unit operates correctly.

Copyright 2004 Comtech EFData Corp. –3– an/PSREPLACE.DOC 8/26/044
CDM-600 Modem Power Supply Replacement Procedure
Figure 1
Figure 2
U89 Crystal OSC.C485
PL/0424 Board
Turbo Option Slot (J3)
+
[
L94
AC Input
Module
Fan
¤
N
ew Power
Supply
(PL/9971-1
Rev. D)
¤
Ground
Screw
¤
Attaching screws
(5/32” max height)
Shield
Bracket
(remove for
new supply)
¤
¤
Fan

Copyright 2004 Comtech EFData Corp. –4– an/PSREPLACE.DOC 8/5/04
M
Mo od de em m P Po ow we er r S Su up pp pl ly y R Re ep pl la ac ce em me en nt t P Pr ro oc ce ed du ur re e f fo or r C CD DM M- -5 55 50 0/ /5 55 50 0T T
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.
3 Locate the old power supply (may be Shindengen FYX600/61G or PL/9971-1, Revision A, B, or C). Remove both AC
input and DC output connectors, and ground wire from the old power supply.
4
Remove and discard the two machine screws that secure the power supply (from underneath the modem) to the
chassis and then remove the old power supply.
CAUTION
Do not apply power to the supply without proper loading (0.2A min.) or connection to the modem. Failure to
follow this direction may cause damage to modem when connected to the supply.
5 Place the new power supply assembly (PL/9971-1, Revision D) in the modem and secure it using the two new shorter
screws (HW/M3X4FHP).
CAUTION
Use only the supplied screws for attaching the power supply to the modem. Incorrect screws may cause
damage to the power supply.

Copyright 2004 Comtech EFData Corp. –5– an/PSREPLACE.DOC 8/5/04
Step Procedure
6
Connect the ground wire to the power supply by using the screw in the location near the ground spade on the power
supply. See Figure 3.
CDM-550/550T Modem Power Supply Replacement Procedure
.
Figure 3
7
Connect the AC input and DC output connectors to the power supply.
CAUTION
Connectors must be correctly aligned and fully seated onto board and power supply.
8
Re-install the cover to the chassis and secure it using attaching screws.
9
Apply power and verify that the unit operates correctly.
If you experience a problem, or have any questions, contact Comtech EF Data Customer Support for assistance:
Comtech EF Data Customer Support
Phone [phone] Email - [email protected]
AC Input
¤
N
ew Power
Sup
p
l
y
(PL/9971-1
Rev. D)
¤
Ground
Screw
¤
Attaching
(5/32” max