User manual

CHAPTER 6 : MAINTENANCE

6.1 Description

This chapter gives you the information of maintenance and the required instruments in

order to let you recover the troubles quickly.

6.2 Instruments

The only instrument you need is a mult-meter, due to the embedded digital and analog

test abilities.

6.3 Periodic Maintenance

For every three months, you should do the following jobs.

(A) Turn the power off, clean the modem, check the plugs, make sure all the

connectors are connected firmly.

(B) Be sure that the indicators function well.

6.4 Troubleshooting

Once the Network Series Modem malfunctions, please check and record the

indicators at the moment then turn the power off. Consequently, make sure the IC's on

printed circuit board are firmly sited. Try to turn the power on again, if the trouble still

exists, please follow the procedures below.

1) Power Unit

• Make sure you get a proper power source. If no indicator is lighted,

probably the problem is the power unit.

• Check the power fuse; if it is broken, replace it.

2) RS-232 Interface

• Do the AL (local analog loopback) test, feed some data into the modem

and check if they were returned correctly.

• Please make sure the interface is connected firmly; also check if the cable

is in good condition.

6.5 Return Procedures

We suggest the individuals who hold a malfunctioned the Network Series

Modem would contact with your local representative or distributor of or just

directly access our customer service department as soon as possible in order not to

cause catastrophe. You may find the contact address and phone number in the cover

sheet of this manual.