I Noise Suppression Devices - IBM 6400 series Maintenance Manual

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.
Duplicate the number of turns around the shielding beads when
installing or replacing the control panel cable. See Figure 56.
Noise Suppression Devices
IMPORTANT
375