Fluke ScopeMeter 123 Service Manual page 106

Each input banana jacket is provided with a rubber sealing ring (Input A,B
item 9, COM input item 10). Ensure that the rings are present when
reassembling the main PCA unit!
To avoid contaminating the main PCA with oil from your
fingers, do not touch the contacts (or wear gloves). A
contaminated PCA may not cause immediate instrument failure
in controlled environments. Failures typically show up when
contaminated units are operated in humid areas.
Note
Caution
6-3. Main PCA Unit Assembly
Disassembling the Test Tool
6.3 Disassembling the Main PCA Unit
6
ST8015.CGM
6-7