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Epson WorkForce Pro WF-7840 troubleshooting

Epson WorkForce Pro WF-7840 (C11CH67201): ink (from Epson coverage); paper; reviewer note; model and serial; cartridges; paper, and a fix for each symptom below.

Ink (from Epson coverage)
Four individual DURABrite Ultra 812 pigment cartridges, standard 812 (about 350 black, 300 color pages) and 812XL (about 1,100 each).

OfflinePaper jamNot printingBlank pagesFadedSmudges

Part of Epson printer model troubleshooting

Reviewed records

2 exact answers

Diagnose the exact device problem

Epson · firmware

Epson WorkForce Pro WF-7840 firmware update will not install

Open record Epson · smudges

Epson WorkForce Pro WF-7840 leaves smudges, spots or repeated marks

Open record

Confirm the model first

Which units this covers, and how to tell yours is one of them

Model numbers and patterns: C11CH67201

Published specification

What is true of this model and changes how you fix it

Official specifications
Same core engine as the WF-4830 (25 ppm black / 12 ppm color, PrecisionCore Heat-Free, DURABrite Ultra pigment cartridges), but wide-format: borderless prints up to 11x17in, wide-format media up to 13x19in, and Long Document Mode for banners up to 42.7in. 500-sheet capacity.
Type — wide-format business INKJET all-in-one
A business INKJET AIO that prints and scans up to 13x19 (A3+) with duplex and ADF, using pigment ink CARTRIDGES. Still inkjet, so the printhead can CLOG if unused; run head cleaning for faded output.
Wide-format & cartridges
Handles ledger/A3 documents; a missing color is a clog or empty/unseated cartridge. Genuine Epson cartridges (high-yield for cost).
Connectivity
Wi-Fi/Ethernet/USB via Epson Smart Panel; 'offline' is usually a network/queue issue.
Paper
Two 250-sheet input trays, a 50-sheet rear tray and a 50-sheet feeder. It prints up to 13 x 19 in.
Reviewer note
RTINGS-linked reviews say wide sizes such as tabloid needed settings changed at the printer, not only on the computer.
Model and serial
The WF-7840 is an Epson wide-format office printer that prints on A3. Its serial is on a label at the back.
Cartridges
It uses high-capacity Epson cartridges. A wide-format printer uses ink faster, so keep a spare. Install each in its slot.
Paper
Use the rear feed for thick or large sheets. Slide the guides, and set the paper type in the driver so the printer uses the right amount of ink.
Wide-format printing
To print on A3, load the paper in the rear tray and set the size in the driver. Wide sheets must be flat and uncurled. The printer can print borderless on some sizes.
Maintenance
Run a nozzle check monthly. If the print head clogs, run a cleaning. Epson's maintenance box collects waste ink, and the printer warns you when it needs replacing.

Where these figures were read. epson.com/For-Work/Printers/Inkjet/WorkForce-Pro-WF-7840-Wireless-Wide-format-All-in-One-Printer/p/C11CH67201 (Epson US product page)

Manufacturer support for this product line. Epson Support — Printer support. Official Epson model manuals, drivers, ink, paper and maintenance support.

Also read for this model. Epson US — WorkForce Pro WF-7840; RTINGS — Epson WorkForce Pro WF-7840 review.

Exact questions

Questions that only have an answer for the Epson WorkForce Pro WF-7840

Paper jams when I print large sizes on my Epson WF-7840.+

For wide (A3/ledger) media, load it in the correct tray/orientation the printer expects, adjust the paper guides snugly, and set the exact paper size in the driver — a size/tray mismatch is a common cause of jams and skew on large formats. Do not overfill the tray, and use flat, undamaged paper. If a jam occurs, follow the on-screen location to clear all pieces. For faded output (separate from jams), run a nozzle check and head cleaning, since it is an inkjet.