Epson DFX-8500 Service Manual page 183

4. Carriage operation is normal, but the self-test is printed incorrectly (2/3).
A
Check the printhead
coil resistance.
Is the
printhead resistance
correct?
Yes
Check the printhead drivers.
Are the
drivers OK?
Yes
If the ribbon mask is not seated
properly, reseat or replace it.
Is the problem
fixed?
No
Refer to Section 5.3, Repair of the
Printer Mechanism.
B
No
No
Replace the DRV
board.
.
Yes
Check the printhead drivers.
Are the
drivers OK?
Yes
Replace the printhead .
Is the problem
fixed?
Yes
END
Refer to Section 5.3, Repair of the
Printer Mechanism.
TROUBLESHOOTING
Replace the DRV
No
board and the
printhead.
No
B
5-9