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Error 64:1:Medium Severity

Esternal HD accessory not connected

Last updated: February 22, 2026

Severity:Medium Severity
Affected:0 models
DIY Fix:Possible
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DesignJet 450C repair- clutch error

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What This Error Means

Esternal HD accessory not connected

Step-by-Step Troubleshooting Guide
  1. 1

    Turn off/on. Power on again wile pressing MENU,OK and Cancel simultaneously, when system promts press OK twice, test with other USB, repalce formatter board

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