WFM90D and WFM91D ServiceManual 6-3
Remove and Replace
This section tells you how to remove and replacethe customer replaceable
modules and parts of the WFM90D or WFM91D Handheld Waveform,Vector,
Picture, and Audio Monitor.
CAUTION. Toprevent damage to the instrument, disconnect the power adapter
and removeinstalled batteries from the monitor before starting disassembly. See
Batterieson page 6--28.

ToolsRequired

Use the tools in Table6--1 to disassemble the instrument to its individual
modules. Some of these tools are requiredonly for removalof specific instru-
ment components.
Table6- 1: Tools required for module removal
Name Description
Torxscrewdriver handle Accepts Torx-driverbits
T-10Torx tip Torx-driverbit for T-10 size screw heads
#1point Phillips tip
9/16″hexagonal driver Deep socket
1/4″hexagonal driver
Flat blade screwdriver
Tweezersor needle-nose pliers
Cleaners SeeCl eaning on page 6--1
Soldering iron 40W
Solder 2% RMA flux content solder