Micro-Aide LDM-1 Manual de usuario descargar pdf (Pagina 32)

LDM User Manual

PCB. PCB removal should be performed in accordance with the following

procedure. Refer to Figure 2 on page 7. Power to the nest can be left on while

PCBs are being removed and inserted. Damage will not occur provided nor-

mal care is exercised.

• Disconnect the cables attached to the PCB at the rear of the nest. Modems

are labeled 1 through 16.

• Open the hinged front cover.

• If the PCB bracket is still in place remove it from the chassis by unscrewing

both ends. The PCB bracket can be discarded. While depressing the PCB

retainer bar, rotate the PCB ejector upward and remove the PCB from the

chassis.

• Inspect or replace the PCB. Change the setup configuration as necessary.

• Install the PCB by aligning its edges with the plastic card guides secured to

the top and bottom panels of the nest. Push the PCB forward until it clears

the retainer bar.

• Attach any cables to their respective PCB connectors. Cables are keyed, so

they can be inserted in only one direction. Do not force a cable into a connec-

tor.

• Close the front cover.

JUMPER AND SWITCH LOCATIONS

Several jumpers and switches are mounted on the LDM-1 PCB. Only SW3,

which controls the receive channel Equalization setting, is accessible exter-

CAUTION: Electrostatic discharges can cause serious damage to electronic

components. Normal anti-static precautions are recommended when han-

dling the LDM-1 PCB.

WARNING: The two-position power connector must be inserted on the top

two pins of the PCB's six-position connector. Failure to do so will result in

damage to the PCB.

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Micro-Aide LDM-1 Manual de usuario Pagina 32