MY PRINTER hp laserget 4250 dtn is displaying 57.4 error when I turned it on, what can I do? I am ofetn requested to suitch off and then to switch on but it fails to mark " Ready"

57.4 Main fan error

Hi I hope this will help

The text come from the hp manual

good luck Ian

Q2431-90912 Chapter 7 Troubleshooting 287

57.X

PRINTER ERROR

To continue turn off then on

or

57.3

EP FAN FAILURE

or

57.4

MAIN FAN FAILURE

A printer fan is not functioning.

X Description

3 EP cartridge fan, right side

(LJ 4300 only)

4 Main cooling fan, left side

Turn the printer off and then on.

57.3 Cartridge fan error (F2)

1. Reconnect the connector

between the fan and the

DC controller PCA

(location J78).

2. Replace the fan. See "Cooling

fan (right side;

HP LaserJet 4300 series

printer only)" on page 170.

3. Replace the

DC controller PCA. See

"DC controller PCA" on

page 181.

57.4 Main fan error (F1)

1. Reconnect the connector

between the fan and the

power supply.

2. Verify that the ribbon cables

are fully seated in the

connectors on the

DC controller PCA.

3. Replace the fan. See "Main

cooling fan (left side)" on

page 168.

4. Replace the power supply.

See "Power supply" on

page 188.

5. Replace the

DC controller PCA. See

"DC controller PCA" on

page 181.

57.7

DUPLEX FAN FAILURE

The cooling fan in the optional

duplexer is not functioning.

1. Turn the printer off and then

on.
2. Replace the duplexer.