Comtech EF Data CDM-600 Installation and operating instructions

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.

Tools

1 #2 Phillips Screwdriver

2 Soldering Iron

3 Solder

4 Tweezers

5 Grounding strap

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-

-6

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.

Remove the machine screws located on top and remove the cover from the chassis.

Step Procedure

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.

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.

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.

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.

Locate the capacitor at C485 and inductor at L94 on the PL/0424 IF modem card. See Figure 2.

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.

Re-install the cover to the chassis and secure it using the attaching screws.

Apply power to the unit and verify that the unit operates correctly.

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

ew Power

Supply

(PL/9971-1

Rev. D)

Ground

Screw

Attaching screws

(5/32” max height)

Shield

Bracket

(remove for

new supply)

Fan

M-

-5

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.

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.

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.

Step Procedure

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

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.

Re-install the cover to the chassis and secure it using attaching screws.

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 1.480.333.4357 Email - [email protected]

AC Input

ew Power

Sup

(PL/9971-1

Rev. D)

Ground

Screw

Attaching

(5/32” max

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