My WFM90 does not run off battery power but works fine from the AC power connector. What is wrong?

My WFM90 does not run off battery power but works fine from the AC power connector. What is wrong?

The combined symptoms of working off the AC power adaptor but not working from battery power usually indicates a burned-out fuse. Please consult the WFM90D service manual available on our website at the link below for instructions on how to replace the fuses in your unit:

WFM90 Service Manual

Replacement fuses can be ordered from Tektronix as part number 159-0378-00.