Od: No Head Error; Oe: Head Driver Error - Epson DFX-9000 Repair Manual

Epson DFX-9000 Field Repair Guide

OD: No Head Error

Cause: Could not detect the presence of the Print Head. During power-on initialization, the print head thermistor is
checked. This error is caused by not getting a valid reading from the print head thermistor.
Action:
1. Check that the Print Head is fully seated.
2. Inspect the Carrier Cable Unit (FFC) for physical damage and proper seating in its connectors (CNFHD1,
CNFHD2,CNRHD1, and CNRHD2 on the ROM Board).
3. Test the print head thermistor with an ohmmeter by placing the ohmmeter leads across contacts SEN1 and
SEN2 of the Print Head. The resistance value should be approximately 1k - 15k ohms, depending on the
internal temperature of the Print Head. The warmer the Print Head, the lower the resistance reading.
4. Replace the ROM Board.

OE: Head Driver Error

Cause: At least one pin of the Print Head has been energized for an excessive period of time.
Action:
1. Inspect the Carrier Cable Unit (FFC) for physical damage.
2. Replace the ROM Board.
3. Replace the Carrier Cable Unit.
4. Replace the Print Head.
Troubleshooting Printer Component, Software Item, LCD Display, Printer Button
3/29/07
Page 125.