Epson WorkForce Pro WP4020

This section describes Rear ASF Timing Belt tension check.

• This printer is designed so that the tension of the Rear ASF Timing Belt falls within the expected range if you correctly reassemble the unit according to this manual. If the result of measurement of the Rear ASF Timing Belt tension explained in this section is out of standard, readjust the tension as instructed below.
• The standard tension range of the Rear ASF Timing Belt is as follows:
  Standard: 6.0 ~ 7.5 N

Tools

• Sonic tension gauge
• Plastic tweezers

When performing the Rear ASF Timing Belt tension measurement, make sure of the following.

• Perform Rear ASF Timing Belt tension measurement before installing the Rear ASF Assy.
• Bring the microphone of the sonic tension gauge within 5 mm from the Rear ASF Timing Belt but do not let it touch the belt.
• Flip the Rear ASF Timing Belt as weak as the sonic tension gauge can measure it.
• Be careful not to damage the Rear ASF Timing belt when flipping it with the plastic tweezers.

1. Set the following parameters to the sonic tension gauge:
   ▪ Weight: 1.3 g/m
   ▪ Width: 4 mm
   ▪ Span: 107 mm
2. Bring the microphone of the sonic tension gauge close to the Rear ASF Timing Belt on the position shown in Figure
3. Press the “MEASURE” button of the sonic tension gauge and flip the Rear ASF Timing Belt with plastic tweezers and measure the tension of the belt.
4. Rotate the PF Roller one turn in the direction of the arrow, and measure the tension of the belt. Repeat the same measurement four times (including the first one). After measuring it five times in total, check the average of the measured values falls within the standard range.