Versitron F270 Series, Техническое руководство

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SECTION 5
MAINTENANCE AND TROUBLESHOOTING
5.1 INTRODUCTION
This chapter contains general information designed to isolate a malfunction in the Model F270X to a
replaceable unit. These units are not equipped with redundancy. Therefore, a failure in one of these units would
interrupt service.
5.2 FAULT ISOLATION
The steps in Table 12 should be taken to check a nonoperating Modem. Contact VERSITRON
Customer Service for additional diagnostic assistance or to arrange for repair as necessary.
STATUS INDICATOR PROBABLE CAUSE CORRECTIVE ACTION
No AC power Check that both ends of the transformer are
connected
Blown Fuse Replace with 250V 1A slo-blo fuse
POWER (PWR) LED is OFF
Other power supply circuit problem Contact VERSITRON for assistance
1.
Check that fiber optic cables are properly
connected
2. Check that the remote unit power is on and the
fiber optic connectors are properly attached
3. Measure the optical levels on both ends (if
possible) in order to check the optical link
ALARM (ALM) LED is ON Incorrect optical signal level received at
receiver input
4. Contact VERSITRON for assistance
HOOK LED is ON Possible problems ranging from a
telephone set in an Off-Hook position to
a problem with the Off-Hook circuit Check if the telephone set receiver is seated in the
cradle correctly. If this is not the case, contact
VERSITRON for assistance
LOOP LED is ON Current supplied by the central office is
fluctuating from 17mA to 25mA Check the exchange the exchange line coming from
the central office or the Switch
RBAT LED is ON Voltage between Tip and Ring are
reversed Check that the Tip and Ring on the 2-wire UTP
coming from the central office are not reversed. That
is, Tip wire is not connected to the Ring on the
Modem’s RJ11 connector and vise versa
Modem is not working properly Default jumpers and switch settings are
not set properly 1. Check if SW1-1 is OFF and JP3 is not removed
2. Check if SW2 is properly set for the desired
interface (i.e. copper or fiber network
application, see table 4)
3. Contact VERSITRON for assistance
TABLE 11: NONOPERATIONAL INDICATORS