Power-on checks
The basic digital-sender functions should start up as soon as the digital sender is plugged into an
electrical outlet in a wall receptacle and the power switch is pushed to the on position. If the digital sender
does not start, use the information in this section to isolate and solve the problem.
Power-on troubleshooting overview
Turn on the digital sender. If the control-panel display remains blank, random patterns appear, or
asterisks remain on the display, perform power-on checks to locate the cause of the problem.
During normal operation, the main cooling fan begins to spin briefly after the digital sender power is
turned on. Place your hand over the holes in the rear cover, above the formatter. If the fan is operating,
you will feel a slight vibration and feel air passing into the digital sender. You can also lean close to the
digital sender and hear the fan operating. When this fan is operational, the dc side of the power supply
is functioning correctly.
NOTE: NOTE: If the formatter is not seated correctly or if it is not functioning correctly, the
device will not power up and no power will be available to the fans. This condition sometimes can
be mistaken for a power-supply issue when the power supply is functioning correctly.
After the fan is operating, the main motor turns on (unless the top cover is open, a jam condition is
sensed, or the paper-path sensors are damaged). You should be able to hear the main motor if it is on.
If the fan and main motor are operating correctly, the next troubleshooting step is to isolate the remaining
problems.
If the control panel is blank when you turn on the digital sender, check the following items.
1. Make sure that the digital sender is plugged into an active electrical outlet that delivers the correct
voltage.
2. Make sure that the on/off 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 wire-harness is connected. See
External control-panel
cable on page 63.
5. Remove any HP Jetdirect or other EIO cards, and then try to turn the digital sender on again.
6. Verify that the formatter “heartbeat” LED is blinking. See
LEDs on page 126. The heartbeat LED
indicates that the formatter is fully functional. If the heartbeat LED is not blinking, reseat the
formatter assembly.
If the scanner base fan is not operating, verify that all connectors to the power supply and the scanner
base fan are correctly seated. If the fan is still not functional, replace the components one by one until
the system is functional.
NOTE: It is important to have the control panel functional as soon as possible in the
troubleshooting process so that the control-panel display can be used to help locate digital-sender
errors.
ENWW Troubleshooting process 113
