OKI B431d review

Choose the B431d for direct computer printing

The OKI B431d is the direct-connection member of the older B431 monochrome LED range. It combines automatic two-sided printing, a 250-sheet cassette and a separate multipurpose paper path. Its main distinction from the B431dn is the connection arrangement: the d version does not include the dn model's built-in Ethernet print server.

This assessment concerns the black 120V unit, part 91659901. A similarly named 220V version and the networked dn configuration have separate order numbers. The B431dn+ is also a different model with a different speed declaration.

Automatic duplex is confirmed for Letter and A4

The original automatic-duplex instructions identify Letter and A4 ordinary paper, suitable paper weight and the cassette path. Select the compatible computer driver and the required long-edge or short-edge binding. This is automatic two-sided output; it does not require the manual first-pass-and-reload routine used for certain other paper choices.

Legal paper appears in the general supported-size table and in the manual-duplex instructions. It is not named in that automatic-duplex section. A buyer who needs unattended two-sided Legal contracts should therefore choose another documented configuration, even though the B431d can print one-sided Legal documents.

A multipurpose feeder is useful, but its capacity needs checking

The standard cassette holds 250 ordinary sheets. A 530-sheet second cassette is optional, changing both the available paper supply and the installed size. An illustration with the extra drawer does not make that drawer part of every offer.

The original Americas brochure and manual-duplex procedure describe a 100-sheet multipurpose path, while the guide's later specification table lists 50. Because those original figures conflict, we do not use a combined standard-input capacity as a confirmed questionnaire threshold. For envelopes and other special stock, use the instructed multipurpose path, appropriate paper settings and required output arrangement; ordinary-sheet capacity is not envelope capacity.

USB and parallel do not make this a network model

The manufacturer lists USB and parallel interfaces for the B431d. Ethernet is reserved for the dn versions in the same specification. Sharing a computer's attached printer is a separate computer-managed setup, not proof that this unit contains an Ethernet interface.

Wi-Fi, native AirPrint, Mopria and a verified PIN-release workflow are not established by the reviewed material. Printer memory, an LCD panel or support for a page-description language should not be treated as equivalent features. If built-in wired sharing is the requirement, compare the B431dn instead of expecting the d suffix to provide it.

The 40ppm figure is a one-sided Letter declaration

The original guide gives 40 pages per minute on Letter and 38 on A4 for the ordinary B431 engine. Those numbers are manufacturer declarations, not our timing results, duplex rates or complete application-job measurements. The higher 47ppm Letter figure belongs to the separate B431dn+.

The 80,000-page maximum monthly duty cycle is another distinct measurement. It does not confirm a recommended sustained monthly workload. This review therefore does not convert that maximum into a promise that regular high-volume months are appropriate.

Check supplies, physical access and current driver support

The B431d uses separate toner and image-drum components. The brochure declares a 2,000-page starter and 4,000- or 10,000-page replacement toner yields under ISO/IEC 19752. Remaining toner, component wear, present prices and actual ownership cost depend on the individual offer and use; a declared cartridge yield cannot establish them.

The documented body is 15.2×14.3×9.6 inches and approximately 26lb without the optional second tray. Leave room for paper loading, rear output, cables and service access. The source lists older Windows and Mac systems, so check the actual current driver before committing to an established USB workflow. Choose a multifunction printer when the task includes scanning or copying: the B431d's output mechanism does not supply either function.