Comtech EF Data CDM-550T Uygulama Notu - Sayfa 2

Modem Comtech EF Data CDM-550T için çevrimiçi göz atın veya pdf Uygulama Notu indirin. Comtech EF Data CDM-550T 5 sayfaları. Power supply replacement procedure

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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.

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.

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.

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.

CAUTION

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).

Use only the supplied screws for attaching the power supply to the modem. Incorrect screws may cause

damage to the power supply.

CAUTION

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.

Connectors must be correctly aligned and fully seated onto board and power supply.

CAUTION

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 Ω resistor.

Check for proper polarity orientation when installing the capacitor.

CAUTION

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.

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