●Make sure you used the phone cord supplied in the box with the printer to connect to the telephone wall jack. One end of the phone cord should be connected to the port labeled 1-LINE on the back of the printer and the other end to your telephone wall jack, as shown in the illustration.

1Telephone wall jack

2Use the phone cord supplied in the box with the printer to connect to the "1-LINE" port

If the phone cord that came with the printer is not long enough, you can use a longer 2-wire phone cord to extend the length. You can purchase the cord at an electronics store that carries phone accessories.

●Try connecting a working phone and phone cord to the telephone wall jack that you are using for the printer and check for a dial tone. If you do not hear a dial tone, call your local telephone company for service.

●Other equipment, which uses the same phone line as the printer, might be in use. For example, you cannot use the printer for faxing if an extension phone is off the hook, or if you are using a computer dial-up modem to send an email or access the Internet.

●Check to see if another process has caused an error. Check the display or your computer for an error message providing information about the problem and how to solve it. If there is an error, the printer cannot send or receive a fax until the error condition is resolved.

●The phone line connection might be noisy. Phone lines with poor sound quality (noise) can cause faxing problems. Check the sound quality of the phone line by plugging a phone into the telephone wall jack and listening for static or other noise. If you hear noise, turn Error Correction Mode (ECM) off and try faxing again. For information about changing ECM, see Send a fax in Error Correction Mode on page 52. If the problem persists, contact your telephone company.

●If you are using a digital subscriber line (DSL) service, make sure that you have a DSL filter connected or you cannot fax successfully. Click here to go online for more information.

●Make sure the printer is not connected to a telephone wall jack that is set up for digital phones. To check if your phone line is digital, connect a regular analog phone to the line and listen for a dial tone. If you do not hear a normal sounding dial tone, it might be a phone line set up for digital phones.

●If you are using either a private branch exchange (PBX) or an integrated services digital network (ISDN) converter/terminal adapter, make sure the printer is connected to the correct port and the terminal adapter is set to the correct switch type for your country/region, if possible. Click here to go online for more information.

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7645 specifications

The HP 7640 and 7645 are part of HP's formidable line of wide-format printers designed for businesses that require high-quality printing for posters, brochures, and technical documents. Built with reliability and efficiency in mind, these printers offer advanced features and technologies that cater to diverse printing needs.

One of the standout features of the HP 7640 and 7645 is their exceptional print quality. These printers utilize HP's thermal inkjet technology, which ensures crisp, clear results with vibrant colors and sharp text. The printers support a wide color gamut and are capable of producing high-resolution prints, making them ideal for graphic-intensive applications. The versatile media handling allows users to print on various substrates, from plain paper to glossy photo paper and even heavyweight posters.

Both models support wide-format printing, with maximum print sizes up to 44 inches wide. This makes them perfect for businesses in industries such as architecture, engineering, and advertising. The HP 7640 and 7645 can print on sheets or rolls, providing users with the flexibility to handle large print jobs efficiently.

Another significant feature is the HP Smart App integration, which allows users to print and manage their printing tasks through smartphones and tablets. This capability enhances productivity, enabling users to take control of their printing needs remotely. Additionally, both printers come with intuitive touch-screen interfaces that simplify operation and provide real-time insights into printer status and supplies.

In terms of connectivity, the HP 7640 and 7645 boast versatile options, including USB, Ethernet, and wireless connectivity. This makes it easy to integrate the printers into existing office networks, enabling multiple users to access the printer from various devices. Cloud printing support further enhances operational convenience, allowing users to print documents from their preferred applications without the need for intermediate downloads.

The construction of the HP 7640 and 7645 emphasizes durability and low maintenance. With features designed to minimize downtime, these printers are engineered for consistent performance, making them suitable for high-demand environments. Their environmentally friendly design, including energy-efficient operating modes and recyclable cartridges, aligns with modern sustainability practices.

In summary, the HP 7640 and 7645 printers are packed with cutting-edge technology and practical features that meet the diverse demands of today’s business landscape. With superior print quality, wide-format capabilities, and user-friendly technology, they provide a reliable solution for high-quality printing requirements.
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