IBM 6400-I15 Maintenance Manual - Page 375
Appendix I Noise Suppression Devices
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I Noise Suppression Devices Ferrite noise suppressors are installed in the printer to reduce radio frequency interference (RFI) to and from electronic equipment located near the printer. Two kinds of ferrite noise suppressors are used: 1. Shielding Bead-Cylindrical core through and around which the control panel cable assembly is wound. Two are required. 2. Ferrite Clamp-A noise suppression core housed in a hinged plastic case and attached with adhesive to the wall of the card cage. The parallel I/O cable assembly passes through this core. Figure 56 shows how these devices are installed. If you replace either of these cable assemblies, note the number and location of noise suppressors before remove the defective cable. Make sure you install the noise suppressors on the replacement cable assembly. IMPORTANT Duplicate the number of turns around the shielding beads when installing or replacing the control panel cable. See Figure 56. Noise Suppression Devices 375
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