~JO - Head Test Non-Fatal

Overview

The ~JO command overrides printhead element status check failures, allowing printing to continue despite detected bad printhead elements. Used temporarily when printhead has minor defects but printing must continue until replacement is available.

Syntax

~JO

Parameters

None

Description

• Overrides head test failures
• Allows printing to continue
• Suppresses error messages
• Temporary measure only
• Quality may be affected

Examples

Enable Override

~JO

Allows printing despite bad elements.

Important Warnings

⚠️ CAUTION:

• This is a temporary workaround only
• Print quality will degrade
• Bad elements show as white lines
• Replace printhead soon
• Not for permanent use

Override Cancellation

Override ends when:

• Printer powered off
• ~JN command sent (Head Test Fatal)
• ~JR command sent (Power On Reset)

Print Quality Impact

With Bad Elements

• White lines in printout
• Degraded barcodes
• Poor graphics
• Acceptable for labels only
• Not for barcodes or critical output

Usage Scenario

1. Printhead element fails
2. Send ~JO (temporary override)
3. Continue printing until replacement
4. ~JN to restore normal mode
5. Replace printhead

Related Commands

• ~JN - Head Test Fatal
• ^JT - Head Test Interval
• ^SR - Set Head Resistance

See Also

• Head Test Fatal (~JN)
• Head Test Interval (^JT)