How to Repair the Epson C589 PSE Power Supply: Step-by-Step Troubleshooting Guide

Question

I found your videos on YouTube showing how to repair an Epson printer. I need help restoring the C589 PSE power supply (model EPS 96E). This is a UV printer based on the L1800, and I need to fix it as soon as possible because orders are waiting to be fulfilled. Can you guide me in any way on how to repair the printer?

Answer:

Thank you for contacting us! I'm sorry I couldn't respond to your request sooner. I understand how crucial it is to resolve printer issues quickly, especially when orders are waiting, but I want to ensure I give your question the attention it deserves. We at BCH Technologies sincerely appreciate your engagement and support, primarily through our YouTube channel (https://youtube.com/@bchtechnologies). Your feedback is invaluable as we strive to improve our technical expertise continually.

Now, let's dive into the solution for your issue with your UV printer's C589 PSE power supply (EPS 96E).

1. Safety Precautions

• Power off and unplug the device: Before starting any work, ensure the power supply is completely disconnected from any power source.
• Use proper safety gear. If you're dealing with live voltage, you must exercise extra caution. Always handle the power supply carefully.
• Discharge capacitors: Power supplies contain large capacitors that can retain a charge even after unplugging the unit. Before proceeding, safely discharge these capacitors, particularly the three large ones on this board.

2. Visual Inspection

Start by thoroughly inspecting the power supply visually. Look for signs of physical damage, such as burned components, damaged wiring, or swollen capacitors. A strong burned smell often signals component failure.

Also, check all the connections to ensure they're secure and that none of the solder joints are cracked or loose.

3. Test the Fuse

The fuse on your power supply, labeled "F1," is a 250V T1.25A fuse. You can use a multimeter to check if it's blown. This type of fuse is readily available online or in electronic stores. If the fuse is blown, replace it and recheck the power supply. If the fuse blows again, a more significant issue will likely require further investigation.

4. Measure Output Voltage

Measure the output voltages with the power supply turned on using a multimeter. Refer to the schematic drawing for the Epson power supply (https://bchtechnologies.com/products/schema-for-epson-power-supply-c589-c589psb-and-c589pse) to compare your readings with the expected voltage levels. If the voltage is significantly off, the issue could stem from a faulty voltage regulator or transformer.

5. Check for Shorts

Use the multimeter's continuity mode to test for shorts between the ground and other pins on the output side. If there is a shortage, the problem could lie in internal components such as capacitors, diodes, or transistors.

6. Test Under Load

Sometimes, power supplies will appear to function without load but fail under load. Connect the power supply to the printer or a resistor that matches the expected load and recheck the voltage output. If the voltage drops significantly, you may have a defective power supply.

7. Inspect for Overheating

An infrared camera can help detect overheating components such as transistors or transformers. Any component that shows excessive heat could be failing.

8. Check Capacitors

Look for swollen or leaking capacitors on the board. A capacitor that isn't holding its charge could be the culprit. You can test them with a multimeter.

9. Test the Rectifiers

Use your multimeter's diode function to check the rectifiers (diodes or bridges) that convert AC to DC. A short or open diode can prevent the power supply from functioning correctly.

10. Inspect Voltage Regulators

Voltage regulators help maintain a steady output voltage. If one fails, the output may fluctuate or drop. Use your multimeter to test the voltage output directly from the regulator. A lousy regulator may need replacement.

11. Oscilloscope Test for Ripple and Noise (Advanced)

If you can access an oscilloscope, check the output voltage for ripple and noise. Excessive ripple could indicate faulty capacitors or issues with voltage regulation.

12. Replace Faulty Components

If faulty components, such as capacitors or diodes, have been identified, replace them with the correct specifications. Be sure to retest the power supply after each replacement to confirm that the problem has been resolved.

13. Test with a Known-Good Power Supply

If possible, swap in a known-good power supply of the exact specifications to see if the issue persists. This can help confirm whether the original power supply is the root of the problem.

Following these steps should help you identify and resolve the issue with your printer's power supply. Power supplies can fail in various ways, but diagnosing the problem through careful testing will lead you to a solution.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. As a result, we cannot provide remote troubleshooting, suggestions, or support for printer repairs. However, we offer an in-person evaluation and repair service through our local diagnostic facility (https://bchtechnologies.com/printer-repair-service). Due to the high demand for these services, we operate on a first-come, first-served basis, and it may take a few weeks before we can address your printer. Our repair services include both complete printer repairs and specific part replacements, and we provide clear instructions on how to proceed with mail-in or local drop-off options.

Lastly, I highly encourage you to check out resources on YouTube, starting with our channel (https://youtube.com/@bchtechnologies). Using YouTube's search function will help you find specific videos related to your issue. Additionally, other channels may provide helpful solutions.

Thank you again for contacting me. I hope this helps you get your printer back in working condition soon!