Similar models of earlier HP laser printers had this feature, but it became less common with the later models. However, any printer mechanism is subject to wear and degeneration, and typically printers still in use have now seen long service the machine being discontinued with the introduction of the Laserjet 5 in Unfortunately, accessing the solenoids requires disassembling most of the input mechanism. These models also feature a W power saving stand-by mode, which was not included in the original Laserjet 4. Retrieved from ” https: The 4LC was the “first printer designed exclusively for the Chinese market”,  and was released by HP in April
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Similar models of earlier HP laser printers had this feature, but it became less common with the later models.
HP LaserJet 4si Workgroup Laser Printer | eBay
The engine over all is reliable. The tell-tale symptom is a print job with a top margin that shrinks from page to page. An alternative is to enlarge the roller slightly by using heat shrink over the output rollers. These models also feature a W power saving stand-by mode, which was not included in the original Laserjet 4.
North America, Europe and Asia.
A feature of the 4Si particularly dear to graphic designers was the straight paper feed. This saved the company millions in tariff and shipping costs as well as weeks in time-to-market. A quality abrasive is needed to ensure no particles are shed into the mechanism.
Unusually thick paper could be run through the printers without jamming by setting the output tray to “Lower face up ” and having it come out the back of the printer. The engine has a high monthly duty cycle 20, pages and it is not uncommon to find units still functioning well after a million or more page impressions.
This delays the release of the solenoid, which causes the paper to start feeding slightly late. Besides the usual malfunctions common to laser printers with worn rollers or accumulated paper dust, older IIISi and 4Si printers eventually exhibit a “phantom paper jam. This page was last edited on 26 Septemberat This problem is fixed by removing the felt pads, cleaning off the adhesive isopropyl alcohol works welland placing some electrical tape or other material to provide a cushion for the solenoid.
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HP LaserJet 4
This process was used for low-end printers 4L, 4P, etc. The 4LC was the “first printer designed exclusively for the Chinese market”,  and was released by HP in April This can be repaired by replacement of the front fuser door. There are a couple of solenoids at the paper tray input mechanism that have felt pads designed to cushion them when they snap on, and the glue holding these pads in place can migrate to the surface. The error accumulates with each page printed, and eventually the paper is entering the mechanism so late that the printer believes that a jam has occurred.
In many cases, the delivery rollers upper and lower in the upper or final stage of the paper exit are worn or unserviceable. It prints eight pages per minute, and the user cannot extend the feeders.
The 4 series has various models, lassrjet the standard LaserJet 4 for business use, the 4L for personal use and the 4P for small businesses. Retrieved from ” https: Printers that exhibit the “accordion” or “washboard” paper jam problem with the paper tightly concertinaed or folded in the exit paper path often behind the rear access door generally have problems with the paper exit mechanism.
Unfortunately, accessing the solenoids requires disassembling most of the input mechanism. HP LaserJet printers Computer-related introductions in Hewlett Packard dominated the laser printing sector during laserjett time in part due to their reliability, relatively affordable pricing, and the spread of LaserJet 4 models from personal use up to heavy business use.
Problems such as paper jams can be fixed by replacement of pickup rollers located under the toner cartridge, replacement of the fuser door, checking if the paper separation paws are not bent, and replacement of the delivery rollers. Views Read Edit View history.
Replacement kits for these rollers are easily obtainable and can solve the problem. This is not a feature of the original Laserjet 4.