HP 5100LE manual Power on defect or blank display Problem Action

Power on

It is important to have the printer control panel functional as soon as possible in the troubleshooting process so that the printer’s diagnostics can assist in locating printing errors.

Table 29. Power on defect or blank display

Problem	Action
Is the power cord plugged	Verify that power is available. See table 30 on page 189 and table 31 on page
into the wall and the	189.
printer? Is ac and dc
power available?
Is the power switch set to	Set the switch to the on position. You should hear the switch toggle. If the front
on?	right side cover has been removed recently, make sure that the rod that leads
	to the power supply moves as the rocker-switch is toggled.

Does the fan turn on briefly when you turn on the printer?

Note: fan operation is significant because the dc controller controls the fan. An operational fan indicates the following conditions:

1.Ac power is present in the printer.

2.Dc power supply is functional (24 Vdc, 5 Vdc, and 3.4 Vdc are being generated).

If the fan is not working:

1.Turn off the printer and remove the formatter. Disconnect all of the paper- handling options.

2.Turn on the printer and check the fan again.

If the fan is still not working, perform the following steps:

1.Verify that the fan is connected to the power supply.

2.Replace the fan.

3.Replace the power supply.

4.Replace the dc controller

If the fan is working but the printer control panel is blank:

1. Print an engine test. See “Engine test” on page 190.

If the engine test is successful, try the following remedies: a. Reseat the control panel and formatter.

b. If the problem persists, replace the control panel assembly. c. If the problem persists, replace the formatter.

d. If the problem persists, replace the cable from the control panel.

2.If the engine test is not successful:

a.Remove the formatter and try again. If the engine test is now successful, replace the formatter. If the problem persists, replace the dc controller.

b.If the problem persists, verify that the button on paper-handling PCA and the cable to dc controller are in working order. Replace as necessary.

c.If the problem persists, replace the dc controller.

d.If the problem persists, replace the power supply.

188 Troubleshooting Q1860-90918

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