WFM 90 and WFM 91 Service Manual 6–1
Maintenance
This section contains instructions for servicing the WFM 90 or WFM 91
Handheld Waveform, Vector, Picture, and Audio Monitor that include the
following information:
HPreparation procedures to observe before performing maintenance
HProcedures for inspecting and cleaning the instrument
HModule removal and replacement instructions
HTroubleshooting procedures
HAfter-repair adjustments to the instrument
HRepackaging instructions to prepare the instrument for shipment
If the instrument does not function properly, troubleshooting and corrective
measures should be taken immediately to prevent additional problems.
NOTE. Contact your local Tektronix representative for information on where to
return your instrument if it requires repair during the warranty period.

Preparation

Please read and follow these preparation instructions before attempting to
perform any maintenance or service to the instrument.
Make sure of the following before beginning any instrument service:
HThe maintenance or service of this instrument must be performed by
qualified service personnel only.
HRead the Service Safety Summary located at the beginning of this manual
before attempting to perform any maintenance or service to the instrument.
HRead the Operating Information section of this manual before attempting to
perform any maintenance or service to the instrument.

Servicing Prerequisites