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I would try replacing the toner cartridge, as that is the most likely culprit. If that does not help, there may be dirt on the laser window. In that case, cleaning the window should fix it.
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I would try replacing the toner cartridge, as that is the most likely culprit. If that does not help, there may be dirt on the laser window. In that case, cleaning the window should fix it.

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Thanks hdondt... toner has been replaced already, I should have mentioned that. I have flicked through the manual and cannot see a reference to the 'laser window' - can you guide me as to where this is please? Many thanks.
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Thanks hdondt... toner has been replaced already, I should have mentioned that. I have flicked through the manual and cannot see a reference to the 'laser window' - can you guide me as to where this is please? Many thanks.

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The attached file shows vertical banding, or more specifically, loss of toner intensity on the same central area of the page on every page that is printed. The transfer roller is new and I would just like a confirmed diagnosis from someone with more experience than myself as to the most likely cause of this print quality issue. Many thanks.<br />
<a href="https://filedb.experts-exchange.com/incoming/2008/11_w47/78972/print-quality.jpg" target="_blank" class="file-inline" title="Sample print quality (601 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>print-quality.jpg</a>
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print-quality.jpg

The attached file shows vertical banding, or more specifically, loss of toner intensity on the same central area of the page on every page that is printed. The transfer roller is new and I would just like a confirmed diagnosis from someone with more experience than myself as to the most likely cause of this print quality issue. Many thanks.

HP LaserJet 4200 Print Quality Issue - Vertical banding

A printer is a peripheral which makes a persistent human readable representation of graphics or text on paper or similar physical media. Traditional printers are being used more for special purposes, like printing photographs or artwork, and are no longer a must-have peripheral; 3D printing has become an area of intense interest, allowing the creation of physical objects. An image scanner is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image. Hand-held scanners, where the device is moved by hand, have evolved from text scanning "wands" to 3D scanners used for industrial design, reverse engineering, test and measurement, orthotics, gaming and other applications.