Our take
The HP LaserJet 2100xi is a legacy monochrome printer for a buyer who values a documented older paper path and can verify the hardware and software around a specific unit. HP identifies the exact model as product C4139A and marks it discontinued. The 2100 family guide lists a speed of up to 10 pages per minute, true 1,200 by 1,200 dpi output, manual duplex, and two standard trays holding 100 and 250 sheets. A 250-sheet optional Tray 3 is documented for the family, but it should not be assumed to be fitted. The guide distinguishes the networked 2100 TN from the 2100xi; it does not map every factory interface to C4139A, so this review leaves the exact ports unresolved.
A legacy directly managed desk that can validate the exact ports and driver path and accepts manual two-sided handling..
Avoid this model if you need modern wireless sharing, automatic duplex, fast queues, guaranteed current driver support, or a known supply and service path.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The family guide specifies 1,200 × 1,200 dpi output and up to 10 pages per minute for this older printer generation.
- Two standard trays provide 350 sheets in total, with an optional extra cassette documented separately.
- Manual duplex allows occasional two-sided work when an operator can handle the paper between passes.
What to weigh up
- The exact C4139A factory interface configuration is not resolved, so Ethernet or modern wireless should not be assumed.
- The 10 ppm rating is modest, and repeated jobs may take longer than on newer workgroup printers.
- HP marks it discontinued; present condition, consumables, parts, and compatible modern host drivers are not confirmed.
The key details
| Model covered | 2100xi |
|---|---|
| Main functions | Print only |
| Print output | Monochrome laser; up to 10 ppm |
| Two-sided printing | Manual duplex; 350-sheet standard input |
Performance figures are manufacturer claims. Source checked October 4, 2026. Regional models and included accessories can differ.
What the features mean for you
A printer-only role with a narrow use case
The 2100xi is a monochrome print-only model, so it does not replace a copier or scanner. Its age and 10 ppm rating make it most plausible where an existing system already supports the printer or where a simple black-and-white output device is enough. HP's product page identifies model C4139A and says the product is discontinued. That lifecycle status is central to the decision: the specification record describes what the machine was designed to do, but it does not establish the availability of parts or support for a current computer.
The rated speed and resolution describe a different era
HP's LaserJet 2100 series guide gives up to 10 pages per minute and true 1,200 by 1,200 dpi output. Those published figures allow a comparison with other exact models but are not a promise for every file or a modern speed test. Warm-up, page complexity, driver and host setup, and the condition of an individual printer can affect real use. Buyers with a shared queue or frequent long reports should compare the printer's age and measured unit condition with the nominal rating rather than assuming the historical headline will meet a current office expectation.
Manual duplex needs attention between sides
HP describes manual duplex for the 2100 family. It can produce two-sided pages, but the operator must manage the paper between passes; there is no automatic page-turning feature documented for the xi. That approach may be manageable for a few forms or occasional short reports. It becomes a repeated task for large packets and should not be confused with an integrated duplexer. The user guide's feature description is useful, but buyers should confirm the workflow on the actual computer and driver before depending on it for regular office production.
Capacity is helpful only if the trays are present
The family guide describes a 100-sheet multipurpose Tray 1 and a 250-sheet Tray 2 as standard, for 350 sheets altogether. It also describes an optional 250-sheet Tray 3. A seller's machine may not include that option, and tray condition or feed reliability is not established by the original specification. The standard capacity is a useful point of comparison with compact printers, but paper size and media support still need to match the user's documents. Inspect the exact unit and its installed trays rather than turning an optional family accessory into a default claim.
Do not transfer the 2100 TN's network configuration
HP's guide separates the non-TN 2100 from the networked 2100 TN and discusses an EIO slot and optional network equipment. It does not separately map every interface to the exact 2100xi C4139A configuration in the saved packet. Therefore built-in Ethernet, wireless capability, and a particular factory port combination remain unknown for this profile. A buyer who needs a network printer should request a clear rear-panel photograph and check the C4139A label, expansion hardware, and intended connection method before purchase. A parallel or LocalTalk family reference is not sufficient proof for every regional variant.
Check software and supplies before choosing old hardware
The original HP guide verifies model features, not current toner availability, replacement parts, seller condition, or compatibility with a new operating system. The historical Amazon page could not be inspected, so the old ASIN is not used as an exact product destination. Ask the seller for the unit's serial and product label, a recent output sample, installed tray configuration, included toner, known page count if available, and return terms. Check the intended computer's driver or print-server path before relying on the device. Those checks are recommendations for a particular offer; none has been performed on a physical printer for this review.
What else to compare
For a supported modern connection path, compare a newer monochrome printer with exact-model Ethernet or Wi-Fi specifications and automatic duplex if two-sided work is routine.
Before you buy
Does the HP 2100xi print double-sided automatically?
No automatic duplexer is documented for the 2100xi; HP describes manual duplex, which requires handling the pages.
Does the exact C4139A include Ethernet?
The saved family guide distinguishes networked variants but does not map every interface to C4139A, so Ethernet is left unconfirmed.
What is its standard paper capacity?
HP lists a 100-sheet Tray 1 and a 250-sheet Tray 2 for the family, totaling 350 sheets before optional Tray 3.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- HP LaserJet 2100xi product page and 2100 family guide ↗ — checked October 4, 2026.
- HP product page, exact 2100xi / C4139A identity and discontinued status ↗ — checked October 4, 2026.
- HP LaserJet 2100 series guide, p. 2 speed/resolution/manual duplex, pp. 22 and 29–30 interfaces and tray distinctions ↗ — checked October 4, 2026.
The decision
The 2100xi only fits when its legacy speed, manual duplex, and the exact unit's verified connections and drivers match an established workflow. Its old family specifications do not settle present condition or compatibility.
Is it the right fit?
Check the exact model and today’s offers on Amazon.