Lexmark T620 Service Manual page 176

4069-5XX/7XX
To run the Duplex Motor Test:
1. Select Motor Test from the Duplex Tests menu. The duplex
motor test continues to run until the printer is powered off.
– The power indicator blinks while the test is running.
– The duplexer runs the motor at a high speed and then a low
speed and takes an average of the power required for each
speed.
– After all the information is computed, the motor turns off.
3-10
Service Manual