Cleaning; Disassembly - Fluke 867B Service Manual

867B,863
Service Manual

Cleaning

Wipe the GMM with a cloth that is lightly dampened with water or a mild detergent. Do
not use aromatic hydrocarbons, chlorinated solvents, or methanol-based fluids when you
wipe the GMM.

Disassembly

Refer to Figure 3-1 throughout this procedure.
1. Set the GMM selector to OFF. Be sure to leave the selector in this position
The low energy fuse (440 mA) can be replaced by removing the battery pack
2. Remove the six (torqued) screws attaching the case halves. Detach the case halves.
3. Remove the two screws securing the shield. Then pry the shield loose from two
4. Gently pull up on the shield tab and rotate the entire shield away from the circuit
5. Remove the three screws securing the circuit board to the front half of the GMM.
6. Dislodge the circuit board by pushing in on the Volts-Ohms input connector from the
7. Lift the entire circuit board up approximately one inch, dislodging the slotted Battery
8. Rotate the circuit board 180 degrees.
3-4
Modern electronic components are sensitive to static voltages under 100V.
You can develop a charge of 2,000V by walking across a vinyl tile floor or
a charge of 5,000 to 15,000V when polyester clothing moves on your body.
Since 30,000 to 40,000V must be generated before you will feel a shock,
you will not notice these lower voltage static problems that are so harmful
to electronic components. Protection circuits used with these components
can only reduce, not eliminate, susceptibility to ESD. You can cause
degraded performance or failure by touching a sensitive assembly or by
simply exposing the component to the electric field surrounding a charged
object. Component failure from ESD may not occur until two hours to six
months after the initial damage.
To avoid electrical shock or damage to the GMM, never allow
water inside the case. To avoid damaging the GMM's housing,
never apply solvents.
throughout the disassembly and reassembly procedure. Note that you do not need to
remove the bail and battery pack to disassemble the GMM.
only.
stanchions at the top of the circuit board.
board.
lower right front of the GMM. See Detail A.
Eliminator connection (Detail B.)
Note
Warning
Note
3-4.
3-5.