Power subsystem
Power-on checks
The basic product functions should start up when the product is connected into an electrical outlet and the
power switch is pushed to the on position. If the product does not start, use the information in this section to
isolate and solve the problem.
Power-on troubleshooting overview
Turn on the product power. If the control panel display remains blank, random patterns display, or asterisks
remain on the control panel display, perform power-on checks to find the cause of the problem.
During normal operation, the main cooling fan begins to spin briefly after the product power is turned on.
Place your hand over the holes in the right-side cover, near the formatter. If the fan is operating, you will feel
air passing out of the product. You can also lean close to the product and hear the fan operating. Place your
hand over the hole in the right-rear upper corner. When this fan is operational, the DC side of the power
supply is functioning correctly.
After the fan is operating, the main motor turns on (unless the rear or front cover is open, a jam condition is
sensed, or the paper-path sensors are damaged). You might be able to visually and audibly determine if the
main motor is turned on.
If the fan and main motor are operating correctly, the next troubleshooting step is to isolate print engine,
formatter, and control panel problems. Perform an engine test and if the formatter is damaged, it might
interfere with the engine test. If the engine test is then successful, the problem is almost certainly with the
formatter, the control panel, or the cable that connects them.
See
Engine self-test on page 23 for instructions on performing an engine self test.
If the control panel is blank when you turn on the product, check the following items.
1. Make sure that the product is connected directly into an active electrical outlet (not a power strip) that
delivers the correct voltage.
2. Make sure that the power switch is in the on position.
3. Make sure that the fan runs briefly, which indicates that the power supply is operational.
4. Make sure that the control panel display FFC is connected.
5. Make sure that the formatter is seated and operating correctly. Turn off the product, and then remove
and reinstall the formatter.
6. Remove any external solutions, and then try to turn the product on again.
NOTE: If the control panel display is blank, but the main cooling fan runs briefly after the product power is
turned on, try printing an engine-test page to determine whether the problem is with the control panel
display, formatter, or other product assemblies. See
Troubleshooting process for product not turning on
on page 23.
ENWW Troubleshooting process 21
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