Instruction Sheet for L1800 / 1390 Printhead Testing with Multimeter (Digital Download) Instant Download — Delivered to Your Email

This downloadable test sheet provides all the pin values needed to test Epson L1800 and 1390 printheads using a multimeter. It’s an essential reference for diagnosing whether a printhead is functional or damaged.

What’s Included

• Complete pin connection values and “OL” readings for each test point.

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

• Guidance on interpreting your readings:

  • If a data point shows “OL” but you have continuity, the printhead is burnt out. Yes, it WILL kill your mainboard.

  • If the measured value deviates by more than 20%, either:

    1. The printhead’s internal capacitors are worn out, or

    2. There’s a factory defect affecting ink output.

• Tools Needed
  • L1800/1390 printhead (not included)
  • Multimeter (not included)
  • This sheet (download)
  • Optional: a L1800/1390 printhead cable for easier testing (not included) https://bchtechnologies.com/products/printhead-ffc-bundle-combo-for-epson-l-1800-1390-1400-1410-1430-r260-r270-r360-13x2-9-pin 

We use exact measurement as Epson's secret in-house testing. In factory conditions, Epson measures these values and stores an encrypted correction code as the HEAD ID. When entered into the adjustment program, the printer adjusts voltage automatically so the printhead performs within tolerance.

You can use the sample chart and instructional video (linked above) to learn how to take accurate measurements and compare them.

Delivery Information

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

• The download link is sent instantly to your email address after purchase.

Important Notes

• Please provide a valid email address during checkout.
  Some store networks allow anonymous checkout without sharing your email — in those cases, your order will be treated as a donation, and no refund or download will be provided.

• No refunds are available for digital products.

• If your email service uses aggressive anti-spam filters, please whitelist our domain. We will not resend download links.

Summary

This test sheet is an essential tool for technicians and advanced users who want to verify the condition of Epson L1800 and 1390 printheads. The full version includes all pin connection values and OL readings to ensure accurate printhead diagnostics.