Removing The Main Pca Unit - Fluke ScopeMeter 123 Service Manual

6.2.5 Removing the Main PCA Unit

Referring to Figure 6-1, use the following procedure to remove the main PCA unit.
1. Open the test tool (see Section 6.2.4).
2. Disconnect the LCD flex cable, and the keypad foil flat cable, see Figure 6-2.
Unlock the cables by lifting the connector latch. The latch remains attached to the
connector body.
The keypad foil is provided with a shielding flap that covers the LCD flat cable. The
end of the flap is put under the main PCA unit shielding plate, and can be easily
pulled out.
To avoid contaminating the flex cable contacts with oil from
your fingers, do not touch the contacts (or wear gloves).
Contaminated contacts may not cause immediate instrument
failure in controlled environments. Failures typically show up
when contaminated units are operated in humid areas.
3. Unplug the backlight cable.
If the battery pack or the power adapter is connected, the LCD
backlight voltage on the wire cable is 400V ! (when the test tool
is on).
4. Remove the two screws (item 10) that secure the Main PCA unit to the top case.
5. Lift the screw end of the Main PCA unit and remove the unit by gently wiggling the
assembly from side to side as you pull backwards.
Caution
Warning
Figure 6-2. Flex Cable Connectors
Disassembling the Test Tool
6.2. Disassembling Procedures
ST8035.EPS
6
6-5