968. A main switchboard synchronizing panel is fitted with two synchronizing lamps and a synchroscope. When paralleling, if the synchroscope pointer is at the noon position and one synchronizing light is bright while the other remains dark, what does this indicate?

The observed condition—a synchroscope at the noon position and one synchronizing lamp bright while the other is dark—indicates reversed phase sequence and a burned-out lamp. This discrepancy arises because a functioning lamp system displays symmetrical brightness changes during synchronization, and a dark lamp suggests an open circuit combined with incorrect phase sequence.