92 34980A Service Guide
4 Troubleshooting and Diagnostics
Isolate a Problem with a Plug-In Module
Any module that fails the mainframe self-test or generates a mainframe error must be
replaced at the module level. Only the relay and FET switches have field replaceable
parts. The following table summarizes the repair strategy for the plug-in modules.
Model
Description
Repair Strategy
34921A 40-channel armature multiplexer Relay and Fuse replacement only
34923A 40/80-channel reed multiplexer Relay replacement only
34925A 40/80-channel optically isolated FET multiplexer FET replacement only
34922A 70-channel armature multiplexer Relay and Fuse replacement only
34924A 70-channel reed multiplexer Relay replacement only
34931A Dual 4x8 armature matrix Relay replacement only
34932A Dual 4x16 armature matrix Relay replacement only
34933A Dual/quad 4x8 reed matrix Relay replacement only
34937A 32-channel Form C/Form A general-purpose switch Relay replacement only
34938A 20-channel 5-amp Form A switch Relay replacement only
34941A Quad 1x4 50-ohm 3-GHz RF multiplexer Module replacement
34942A Quad 1x4 75-ohm 1.5 GHz RF multiplexer Module replacement
34945A Microwave switch/attenuator driver Module replacement
34946A Dual 1x2 SPDT terminated microwave switch Module replacement
34947A Triple 1x2 SPDT unterminated microwave switch Module replacement
34950A 64-bit digital I/O with memory and counter Module replacement
34951A 4-channel isolated D/A converter Module replacement
34952A Multifunction module Module replacement
34959A Breadboard module Module replacement
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