GMI Equipment Maintenance 3

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?

Accepted Answer

The fuser roller assembly

Answer

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?

Accepted Answer

Shore A durometer hardness and roller diameter

Answer

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)?

Accepted Answer

To evaporate solvents and improve ink adhesion at each stage

Answer

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?

Accepted Answer

Replace the blanket with a new one meeting OEM specifications

Answer

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?

Accepted Answer

The roller cells are plugged or worn and need cleaning or replacement

Answer

Below-spec cell volume indicates plugged or worn anilox cells that restrict ink delivery, requiring cleaning or roller replacement.

(GMI) Graphic Measures International Certification Practice Test

(GMI) Graphic Measures International Certification Practice Test

GMI Equipment Maintenance 3