Basic Maintenance; Opening The Meter Case; Removing And Reinserting The Circuit Board Assembly - Fluke 87 IV Series Service Manual

87 & 89 Series IV
Service Manual

Basic Maintenance

To avoid electrical shock or personal injury, remove the test
leads and any input signals before opening the case or
replacing the battery or fuses. To prevent damage or injury,
install ONLY batteries or fuses specified for this product.

Opening the Meter Case

To avoid unintended circuit shorting, always place the
uncovered Meter assembly on a protective surface. When the
case of the Meter is open, circuit connections are exposed.
To open the Meter case, do the following:
1. Disconnect test leads from any live source, turn the rotary switch to
2. Remove the battery door by using a flat-blade screwdriver to turn the battery door
3. The case bottom is secured to the case top by four screws, one at each corner.
4. Pull the two halves of the case apart.

Removing and Reinserting the Circuit Board Assembly

The circuit board assembly must be removed to access and replace the LCD.
The circuit board is extremely susceptible to contamination.
Handle it by the input receptacle, fuse clips or edges of the
board only. You can use clean surgical gloves to help avoid
contamination.
1. Open the Meter case and remove the case bottom to access the circuit board.
2. Remove the two Phillips-head screws securing the circuit board to the case top and
3. To reinsert the circuit board, simply place it into the case top with the LCD display
4. Carefully replace the two Phillips-head screws that connect the circuit board to the
Do not over-torque the two Phillips-head screws when you
reconnect the circuit board to the case top. Doing so may
create shielding problems and cause the Meter to give incorrect
readings.
12
the test leads from the front terminals.
fasteners 1/4-turn counterclockwise.
Remove the screws with a Phillips-head screwdriver.
lift it out carefully to avoid contamination.
showing through the window.
case top.
Warning
Caution
Caution
Caution
, and remove
OFF