Frequently Asked Questions

Which cartridge does the M604dn need for printing checks?

This one: the CF281A, sold as the HP 81A, in its MICR form. The standard 81A prints documents; this version at $137.86 is filled with magnetic toner, which is the ingredient that makes the account line on a check readable by bank equipment.

How does MICR printing work on the M604dn?

The printer lays down the toner; the toner does the special part. Characters in the routing line are printed with a magnetically responsive fill, so when the check reaches the bank, its scanners pick up the line and process the check. Your Enterprise M604dn needs no modification — the cartridge is the whole conversion.

Is bank acceptance guaranteed once I install it?

It cannot be, by us or anyone. Your bank's readers, the blank check stock and your accounting software's layout all contribute. The established routine: print a small test batch, let your bank scan sample checks, and begin real runs only after they confirm the line reads properly.

Can the M604dn still print ordinary work with this cartridge fitted?

It can print anything — MICR toner is still toner — but most offices treat the setup deliberately: check stock and this cartridge for payment runs, and the machine's duplexing and network queue for everything else around them. Swapping between a MICR and a standard CF281A takes moments, whenever the workload calls for it.

How many pages should I expect from it?

The cartridge is rated at 10,500 pages. Check pages print very little — one check, a stub, a single line of numbers — so offices running weekly or biweekly payments typically find a single cartridge carries them through a long stretch of runs.

What are the warranty and shipping terms?

Cover is our 1-year warranty with 1-year free returns. Cartridges ship from our Illinois, Pennsylvania, Georgia or California warehouses, support is available Monday–Friday, 9 AM–5 PM CST, and the practical details are collected on our shipping & returns page. The full compatible range is in the HP section.

About This M604dn MICR Cartridge

Plenty of accounting offices already own the right printer and simply never had the right cartridge. The M604dn is a fast, networked, duplexing workhorse; add this CF281A MICR cartridge — 10,500-page rating, $137.86 — and it prints the firm's checks as well. Keep the one discipline that makes MICR work everywhere: a test batch, approved by your bank, before the first live run.