XP600 & ET-8550 ET8550 Printhead Multimeter Test Sheet (Digital Download)

This downloadable test sheet provides all the pin reference values required to accurately test Epson XP600 and ET-8550 printheads using a multimeter. It’s an essential diagnostic tool for identifying whether your printhead is fully functional or electrically damaged before installation.

What’s Included

• Complete pin connection values and “OL” (open line) readings for every test point.

• Sample chart (with accurate reference values) shown in the product images.

• Detailed interpretation guide explaining how to analyze your readings:

  • If a data point displays “OL” but continuity is detected, the printhead is shorted or burnt out — installing it will damage your mainboard.

  • If your measured resistance deviates by more than 20%, it may indicate either:

    • Worn or degraded internal capacitors, or

    • A manufacturing defect impacting ink performance or firing voltage.

Tools Needed

• XP600 or ET-8550 printhead (not included)

• Multimeter (not included)

• This test sheet (downloadable file)

• Optional
  • ET-8550 Printhead Cable (https://bchtechnologies.com/products/ffc-bundle-for-epson-ecotank-et-8550-printhead-2pcs-of14x2-pins-ffc-flat-flex)
  • XP-600 Printhead Cable (https://bchtechnologies.com/products/2pcs-29-pin-40cm-400mm-print-head-cable-for-calca-epson-xp-600-printhead-flat-data-cable-for-xp600-printheads)

About the Test Data

These readings are based on Epson’s proprietary in-factory testing process, used to calculate the printhead’s HEAD ID. Inside Epson facilities, each printhead’s electrical response is measured and encoded into an encrypted correction table. This allows the printer to auto-adjust voltage and waveform to compensate for minor variations.

By following this sheet and the instructional video (linked above), you’ll learn how to take precise measurements, recognize abnormal readings, and confidently determine whether a printhead is within safe operating tolerance.

Delivery Information

• This is a digital file — no physical product will be shipped.

• A download link will be sent instantly to your email address after purchase.

Important Notes

• Please ensure your email address is accurate and valid during checkout.

• Some store networks allow anonymous checkout; such orders will be processed as donations — no refunds or file access will be provided.

• No refunds are available for digital products.

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Summary

The XP600 & ET-8550 Printhead Test Sheet is a must-have diagnostic reference for technicians and advanced users who perform printhead evaluations. It includes all pin connection values, OL readings, and fault indicators — empowering you to verify printhead health before installation or troubleshooting.