Ricoh BR-C1a Basic Service Training page 30

Main Scan Magnification Correction
 In duplex mode, some paper may shrink or enlarge after it
goes through the fusing unit, and this change in paper size
may result in inaccurate registration between the front and
back pages. VCSEL can correct for this.
 By adjusting the pixel clock frequency, the machine can
adjust the width of a dot in the main scan direction by 1/48
of a dot width at 600 dpi.
Slide 30
 Sub scan magnification is done in the IPU board.
VCSEL Laser Technology
1 dot
Reduction
Normal
1 dot
Expansion
30
1/48 dot
1 dot
1/48 dot
BR-C1 Training