Isolate A Problem With A Plug-In Module - Keysight Technologies 34959A Service Manual

4 Troubleshooting and Diagnostics
Error Description
946 "Remote module is unable to perform requested operation"
947 "Channel is not accessible"
948 "Invalid/missing remote module specifier"
949 "Open operation not valid for this channel configuration"
950 "Illegal operation when channel drive enabled"
951 "Switch failed to verify as expected"
952 "Internal channel drive illegal for remote slave module"
953 "Overcurrent detected"
954 "Remote modules configured in an illegal topology"
955 "Illegal operation when remote module's channel drive disabled"
956 "Module hardware: unexpected transaction termination"

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
34921A 40-channel armature multiplexer
34923A 40/80-channel reed multiplexer
34925A 40/80-channel optically isolated FET multiplexer
34922A 70-channel armature multiplexer
34924A 70-channel reed multiplexer
34931A Dual 4x8 armature matrix
34932A Dual 4x16 armature matrix
34933A Dual/quad 4x8 reed matrix
88
Repair Strategy
Relay and Fuse replacement only
Relay replacement only
FET replacement only
Relay and Fuse replacement only
Relay replacement only
Relay replacement only
Relay replacement only
Relay replacement only
Keysight 34980A Service Guide