GMI Equipment Maintenance 3 — Questions and Answers
Question 1: A digital press technician notices color inconsistency appearing after the machine has warmed up for 30 minutes. What component is most likely causing this thermal drift?
- The fuser roller assembly (Correct answer)
- The drum imaging unit
- The paper feed rollers
- The toner hopper
Correct answer: The fuser roller assembly
Fuser roller thermal drift causes changes in toner adhesion and gloss over time as the assembly reaches operating temperature, leading to color inconsistency.
Question 2: When replacing an offset press ink roller, what measurement must be verified to ensure correct installation?
- Shore A durometer hardness and roller diameter (Correct answer)
- Roller weight and surface finish
- Ink absorption rate and length
- Roller width and surface temperature
Correct answer: Shore A durometer hardness and roller diameter
Shore A durometer and roller diameter must match OEM specifications to ensure correct nip pressure and ink distribution across the roller train.
Question 3: In a wide-format solvent printer, what is the function of the media heater zones (pre-heat, print, after-heat)?
- To control ink viscosity in the supply lines
- To evaporate solvents and improve ink adhesion at each stage (Correct answer)
- To flatten media curl before and after printing
- To prevent static buildup on the media surface
Correct answer: To evaporate solvents and improve ink adhesion at each stage
The three heater zones progressively evaporate solvents from the ink, improving adhesion and enabling faster print speeds without smearing.
Question 4: During press maintenance, a technician finds the blanket on an offset press has a smashed area. What is the standard corrective procedure?
- Apply double-sided tape beneath the smashed area to restore height
- Replace the blanket with a new one meeting OEM specifications (Correct answer)
- Soak the blanket in water to restore thickness
- Sand the surrounding area to level the surface
Correct answer: Replace the blanket with a new one meeting OEM specifications
A smashed (glazed or permanently compressed) blanket area cannot be restored and must be replaced to maintain consistent nip pressure and print quality.
Question 5: What does it mean when a flexographic press anilox roller's cell volume is measured significantly below specification?
- The roller is delivering too much ink
- The roller cells are plugged or worn and need cleaning or replacement (Correct answer)
- The doctor blade angle is too steep
- The ink viscosity is too low
Correct answer: The roller cells are plugged or worn and need cleaning or replacement
Below-spec cell volume indicates plugged or worn anilox cells that restrict ink delivery, requiring cleaning or roller replacement.
Question 6: Which type of maintenance log entry is most useful for identifying recurring press mechanical failures?
- A log recording only parts replaced
- A time-stamped log of symptoms, findings, and corrective actions with component IDs (Correct answer)
- A daily production output count
- A weekly ink and substrate inventory
Correct answer: A time-stamped log of symptoms, findings, and corrective actions with component IDs
Time-stamped logs that capture symptoms, findings, corrective actions, and component IDs allow technicians to identify patterns and root causes of recurring failures.
Question 7: A screen printing press is producing images with jagged edges. After ruling out mesh tension issues, what maintenance item should be inspected?
- Squeegee blade sharpness and durometer (Correct answer)
- Ink reservoir temperature
- Registration pin alignment bolts
- Pallet adhesive coating thickness
Correct answer: Squeegee blade sharpness and durometer
A dull or incorrect durometer squeegee blade causes uneven ink deposit and ragged edges, which can mimic registration or mesh problems.
GMI Equipment Maintenance 3
A digital press technician notices color inconsistency appearing after the machine has warmed up for 30 minutes.
What component is most likely causing this thermal drift?