Instruction manual

3–32 Troubleshooting
Print Quality Problems
Missing, light, or smeared characters or
dots:
1. Check the forms thickness lever setting.
2. Check the ribbon for folds or tears.
3. Clean the shuttle frame assembly (page 2–6).
4. Check the platen gap adjustment (page 4–12).
5. Replace one at a time until problem is fixed:
a) shuttle frame assembly (page 5–42)
b) controller board (page 5–10)
All characters or dots are too light or too
dark.
1. Check the forms thickness lever setting.
2. Clean the shuttle frame assembly (page 2–6).
3. Check the platen gap adjustment (page 4–12).
4. Install a new ribbon.
5. Replace one at a time until problem is fixed:
a) controller board (page 5–10)
b) shuttle frame assembly (page 5–42)
Horizontal misalignment. (Dots or
characters move left or right from dot row
to dot row or line to line.)
1. If dots between alternate dot rows are misaligned, check
hammer phasing (page 4–25).
2. Clean the shuttle frame assembly (page 2–6).
3. Check the MPU gap adjustment (Ref: page 5–20).
4. Replace one at a time until problem is fixed:
a) MPU (page 5–20)
b) controller board (page 5–10)
c) shuttle frame assembly (page 5–42)
Vertical misalignment:
1. Dots or characters move up or down
from dot row to dot row or line to line.
2. Incorrect spacing from dot row to dot
row or line to line.
1. Check paper feed motor belt (page 4–4).
2. Check platen gap adjustment (page 4–12).
3. Replace one at a time until problem is fixed:
a) tractors (page 5–50)
b) controller board (page 5–10)
c) paper feed motor (page 5–23)
d) power supply board (page 5–12)
Randomly misplaced dots.
1. Check platen gap adjustment (page 4–12).
2. Check printer grounding.
3. Replace one at a time until problem is fixed:
a) controller board (page 5–10)
b) power supply board (page 5–12)
c) shuttle frame assembly (page 5–42)