Dots Or Characters Missing - Epson FX Series Product Support

EPSON PRINTER
2.10 DOTS OR CHARACTERS MISSING
Note: See chart 2 1 'Print Quality (Probable Causes)', on page 2-11,
before continuing with RAP 2.10
1. Remove top cover (Procedure 4.1). Reconnect control panel (Procedure 4.2).
Disconnect power. Disconnect the print head cable from the printer mechanism.
Measure the resistance between common and each one of the head coil terminals
(Figure 2-4).
All resistances are approximately 22 ohms, except, FX 286 equals approx. 15 ohms.
YES NO
Replace the Print head (Procedure 4.8) and Replace Main Board
(Procedure 4.6)
Return to the initial checks and continue.
2. Remove the Print head. Check the print head for dirty or clogged pin
guide holes. Clean with film remover, if necessary.
3. Check the print head dot wires.
The wires are all straight and un- damaged.
YES NO
Replace the Print head (Procedure 4.8).
Return to the initial checks and continue.
4. Follow TABLE 2.3, on page 2-12, to change the replaceable parts.
Problem is solved.
YES NO
Replace Print head (Procedure 4?8).
I
5. Return to the initial checks and continue.
2-11
REPAIR ANALYSIS PROCEDURES
CHART 2.1 Print Quality (Probable Causes)
Symptonn
Probable Cause
Wrong Character Sets • Improper Switch Settings
• Incorrect Escape Codes
• Defective Proms
• Defective Main Circuit Board
First Printer Character
Distorted
• Carriage Timing
• Loose or Defective Carriage Drive Cable
• Ribbon Drive
Light Characters
• Form Thickness
• Improperly Installed Ribbon
• Ribbon not feeding
• Print Head Gap
• Non Epson Ribbon
Printer Characters at Right
Margin Misaligned
• Carriage Timing
20261A