Fixing the Epson Stylus 1390: Resolving 2H CR Load Position Errors

Diagnosing the Problem

1. CR Encoder Failure:
   The CR encoder strip and sensor track the printhead's position as it moves. The printer can only determine the correct position if the encoder is clean, properly aligned, or damaged.
   
   • Check the Encoder Strip: Ensure it is clean and installed correctly. Wipe it gently with a lint-free cloth and isopropyl alcohol.
   • Inspect the CR Encoder Sensor: Could you confirm that the sensor on the back of the carriage is functioning and securely connected?
2. Timing Belt Issues:
   A misaligned or improperly tensioned timing belt can cause the printhead to move erratically, triggering the 2H error.
   
   • Verify the Belt's Tension: Ensure the belt is neither loose nor tight and properly seated on its pulleys.
   • Check for Tooth Skips: Look for missing or damaged teeth on the belt that could affect movement.
3. Cable or FFC Disconnection:
   Any loose or damaged cable can cause communication failures. Focus on the CRPW data cable:
   
   • Please ensure all cables, including the FFC (Flat Flexible Cable), are securely connected.
   • Could you look over the cable pins for bends or damage?
4. Motor Driver Failure:
   The motor driver controls the printhead's movement. If it malfunctions, the printer cannot position the carriage accurately. Diagnosing this requires professional equipment.
5. Mainboard Failure:
   If other components are functional but the mainboard is not processing signals correctly, it may be the root cause. Issues with a breakout board (if installed) could also interfere.

Suggested Fixes

1. Inspect and Test the CRPW Data Cable:
   
   • The CRPW cable transmits critical data from the encoder sensor to the mainboard. A damaged cable can cause intermittent errors.
   • Consider replacing it with a reliable part, such as this 13-pin page-width CR Encoder Sensor Cable [https://bchtechnologies.com/products/13-pin-page-width-cr-encoder-sensor-csic-ffc-cable-for-epson-l1800-1390-1430-dtf-dtg-printers].
2. Bypass the Breakout Board (if Present):
   
   • Some printers have an additional breakout or driver board to manage roll feed or other functions.
   • You can disconnect the CRPW cable from the breakout board and plug it into the mainboard, bypassing potential issues with the breakout board.
3. Verify Mainboard Integrity:
   
   • If bypassing the breakout board works, the issue likely lies with the breakout board. If not, the mainboard itself may need replacement or repair.
4. Test the Carriage Movement:
   
   • Power on the printer and observe whether the carriage moves smoothly. Listen for irregular noises that could indicate belt or motor issues.
5. Recalibrate Encoder Alignment:
   
   • Misalignment during installation can cause errors. Could you ensure the encoder strip is evenly tensioned and parallel to the carriage path?

When to Seek Professional Repair