FAX B800

The FAX B800 is a Canon fax machine, and the cartridge it runs on is Canon’s FX-4 (1558A002AA) black toner cartridge. It sits in this store’s fax section alongside the Brother machines, but the part itself is a Canon part — when you order for this machine, order by the FX-4 code or the 1558A002AA part number printed on the cartridge you are replacing.

Older fax machines earn their keep by simply continuing to work, and the B800’s supply situation is part of that longevity: the FX-4 is a single black cartridge with no drum decisions, no color slots and no settings to manage. One cartridge comes out, one goes in, and the machine goes back to turning phone-line traffic into paper. For an office keeping a dedicated fax line, that simplicity is the whole point.

Toner Cartridges for FAX B800

Which cartridge should you buy?

The single FX-4 is the straightforward replacement: one cartridge, changed when the old one fades. The 5-pack exists for machines that cannot wait on deliveries — a fax that runs dry midweek stops messages, not just print jobs, so offices with steady fax traffic often keep a multi-pack on the shelf and draw from it. Between the standard 5-pack and the Premium 5-pack, the premium line is the higher-grade build of the same cartridge, for buyers who want the best-finished version of a compatible part. All three listings are the same FX-4 code — pick by quantity and grade, not by fit. Compatible cartridges here carry a 1-year warranty and 1-year returns.

Chip, toner and everyday use

Treat the FAX B800’s cartridge change as a cleanliness exercise as much as a supply swap: power the machine down, slide the old FX-4 out, and keep the new cartridge in its bag until the moment it goes in. Toner page ratings are figured at about 5% coverage, and fax pages — mostly text — sit close to that, so a cartridge should deliver near its expected life. If received pages fade before the cartridge is spent, removing it and rocking it gently side to side redistributes the toner and usually darkens print again. Store spare cartridges flat, sealed, and away from heat.

Frequently Asked Questions

Which cartridge does the Canon FAX B800 use?

Canon’s FX-4 black toner cartridge, part number 1558A002AA. Match either code against the cartridge you remove — both refer to the same part.

Is the FX-4 a Brother cartridge?

No. The FAX B800 is a Canon machine and the FX-4 is a Canon cartridge design. This page appears in the store’s fax listings, but the supply itself is Canon, not Brother.

Should I buy the single cartridge or a 5-pack?

A single suits a quiet fax line and an office that can wait a day for a delivery. The 5-pack suits a machine in daily use, where running dry means missed faxes rather than a paused print queue.

What is the difference between the two 5-packs?

Both hold five FX-4 cartridges. The Premium 5-pack is the higher-grade line of the same compatible cartridge; the standard 5-pack is the regular build. Fit is identical — the choice is grade and price.