Canon LBP 2460 Service Manual - Page 228

CHAPTER 4 III. MEASUREMENT AND ADJUSTMENT A. Mechanical Adjustment 1. Checking the nip width of the fixing lower roller The fixing unit is not designed to allow adjustment of the pressure (nip width). If the nip width is not correct, a fixing problem may occur. Follow the procedure below to check the nip width. 1) Produce an all-black print using an EP-W cartridge, and take the print to the customer's premises. (Use the printer driver tester to output the all-black print.) 2) Put the all-black print in the lower cassette. 3) Press the TEST PRINT switch. 4) When the leading edge of the print emerges at the face-down tray, switch the printer OFF, wait for about 10 seconds, then switch the printer ON again. Deliver the paper from the printer. 5) Measure the width of the glossy band across the paper and check that it meets the requirements as shown in Figure 4-3-1. • Center (a): 4.8 ± 1.2 mm • Right and left sides (b): 5.3 ± 1.2 mm Feed-out direction b Center of A3 all-black print a b Figure 4-3-1 2. Installing the separation guide of the envelope feeder (Adjusting the gap between the separation guide and the lower separation roller) Under normal conditions, remove the separation guide along with the upper cover. If you removed just the separation guide or replaced a bent separation guide, adjust the gap as follows. Install the separation guide 1.5 mm from the lower separation roller. Adjust its position by inserting the thickness gauges (1 mm and 0.5 mm) into the gap between the separation guide and the lower separation roller. 4 - 14