Tektronix 3 Series - Figure 3: AC Line Filter Cable Connections

2. Disconnect the line trigger cable from the I/O board.
3. Disconnect the line input cable from the power supply.
Figure 3: AC line filter cable connections
4. Use a T-10 Torx screwdriver to remove the two screws securing the line filter to the outside of the rear chassis.
Maintenance
3 Series MDO Mixed Domain Oscilloscope Service Manual 14