Zebra ZT420 How To Adjust Printhead Pressure

Watch the video below.

Step-By-Step Instructions On How To Adjust The Printhead Pressure On The Zebra ZT420

Where to adjust

Open the printer and look at the printhead assembly—you’ll see two pressure dials:

• Inside dial (left side)
• Outside dial (right side)

Basic adjustment steps

1. Open the printhead.
2. Locate the two pressure dials.
3. Turn:
   • Counterclockwise → increases pressure
   • Clockwise → decreases pressure
4. Close the printhead and print a test label.
5. Adjust gradually—one step at a time.

Recommended starting points (ZT410)

Use this as a baseline, then fine-tune:

1. 1″ media → Inside: 4 | Outside: 1
2. 2″ media → Inside: 3 | Outside: 1
3. 3″ media → Inside: ~2.5 | Outside: ~1.5
4. ≥3.5″ media → Inside: 2 | Outside: 2

How to fine-tune (most important part)

Adjust based on what you see on the label:

• Print too light overall
  → Increase both dials
• Left side printing light
  → Increase inside dial
• Right side printing light
  → Increase outside dial
• Labels drifting left
  → Increase outside OR decrease inside
• Labels drifting right
  → Increase inside OR decrease outside

Best practices (important)

• Use the lowest pressure needed for good print quality
• Too much pressure can cause:
• Ribbon wrinkles
• Uneven wear on the printhead
• Poor barcode quality
• Always adjust pressure after:
• Changing label width
• Switching media type
• Replacing printhead

Quick rule of thumb

• Start balanced → adjust only the side that looks bad
• Keep both dials as low and even as possible