Agilent Technologies 34980A - 34921 A 40-Channel Armature Multiplexer with Low Thermal Offset

122 34980A Service Guide
5 Disassembly and Repair
Front Panel Disassembly
1 Pull to remove the knob. Use a 7/16” nut driver to remove the nut from the knob
shaft.
2 Remove the four T20 Torx screws from the circuit board and lift the circuit board out.

You can now lift out the keypad.
深圳德标仪器 135-1095-0799