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HP 4050, 4000 manual Power On Defect or Blank Display ProblemAction, If the Fan is not working

Models: 4050 4000

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Table 7-2. Power On Defect or Blank Display (continued)

ProblemAction

Does the Fan turn on for about 4 seconds when you first turn the printer on?

Note: Fan operation is significant since the Fan is controlled by the printer’s Engine Controller Board. An operational Fan indicates the following:

1.AC power is present in the printer.

2.DC power supply is functional (both 24VDC and 3.5VDC are being generated).

3.The Engine Controller Board’s micro-processor is functional.

If the Fan is not working:

1.Turn the printer off and remove the printer’s Formatter PCA. Disconnect all the printer’s Paper Handling Options.

2.Turn the printer on 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 Engine Controller Board.

2.Replace the Fan.

3.Replace the Engine Controller Board.

If the Fan is working but the printer’s Control Panel is blank:

1. Print an Engine Test. See “Engine Test” on page 7-11.

If the Engine Test is successful, perform the following steps: a. Reseat the Control Panel and Formatter Connector. b. Replace the Control Panel Assembly.

c. Replace the Formatter.

d. Replace the cable from the Control Panel.

2.If the Engine Test is not successful, replace the Engine Controller Board.

Note

The Fan only operates during initial power on and while printing, unless

 

the temperature inside the printer is too high. If the temperature is too

 

high, the Fan turns on to cool the inside of the printer.

 

 

7-8Troubleshooting

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HP 4050, 4000 manual Power On Defect or Blank Display ProblemAction, If the Fan is not working
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4050, 4000 specifications

The HP LaserJet 4000 series is renowned for its reliability and efficiency, making it a staple in many business environments. The HP 4000 N and 4000 model variants have been designed with advanced printing technologies to enhance productivity and deliver high-quality output.

The HP 4000 N model is equipped with a robust 1200 dpi resolution, allowing for sharp text and graphics, which is essential for professional documents. It supports a print speed of up to 19 pages per minute, ensuring that even large print jobs are completed quickly. This model features a monthly duty cycle of up to 65,000 pages, making it suitable for medium to large workgroups that demand consistent performance.

One of the defining characteristics of the HP 4000 series is its standout paper handling capability. The standard configuration includes a 250-sheet input tray, a 100-sheet output tray, and the flexibility to expand with optional additional trays. Users can add up to three 250-sheet paper trays for extended capacity, facilitating long-printing tasks without frequent interruptions. The printer also supports various media sizes, ranging from letter to legal and envelopes, catering to diverse office printing needs.

Connectivity is another strength of the HP 4000 N model. It comes standard with a parallel port and a fast Ethernet interface, ensuring seamless integration into networked environments. This allows multiple users to share the printer without sacrificing print speed or quality. The built-in PCL and PostScript compatibility offer versatility when dealing with different print jobs and are crucial for ensuring that text and graphics are rendered correctly.

In terms of consumables, the HP 4000 series utilizes high-capacity toner cartridges, which not only reduce the frequency of replacements but also contribute to lower overall printing costs. Users can expect a yield of around 10,000 pages per cartridge, optimizing productivity and minimizing downtime.

The HP 4000 N and 4000 series are also recognized for their durability and ease of maintenance. With a straightforward control panel and intuitive cartridge replacement process, users can quickly manage their printing tasks. This user-friendly design reduces the learning curve for new staff and enhances overall team productivity.

In conclusion, the HP 4000 N model stands out with its superior print quality, excellent speed, and robust paper handling capabilities. These features, combined with its connectivity options and cost-efficient consumables, make it a valuable addition to any business looking to enhance its printing infrastructure. The durability and reliability of the HP 4000 series ensure that businesses can rely on these printers for their day-to-day operational needs.