Broadcom AEDR-9820 User Manual page 5

The silk screen printed guide line on the PCB is to help in providing visual alignment of the code wheel edge (outer
diameter) for each of the different Rop (CPR) track. A sample diagram showing the position when encoder is aligned to
625 CPR track is as shown in Figure 3 below.
Figure 3 Bottom Side of the PCB
Figure 4 Sample Evaluation Board Mounting with reference to Code Wheel