OHAUS ST300, Service Manual, Page: 18 / 29

CHAPTER 2 MAINTENANCE PROCEDURES
Ohaus Corporation www.ohaus.com 2-2 Starter Series Portable Meter Service Manual
4. Before separating the top
housing from the bottom housing
remove the keypad membrane
connector which connected to
the main PCBA. Take note and
handle the housing rubber ring
with care.
5. Separate Top Housing from
Bottom Housing.
2.4 Removing/Replacing the PCB
If the PCB are suspected of being faulty, it
should be replaced, as follows:
1. Separate the top and bottom
housing as in 2.3.1.
2. Remove the two screws securing
the main PCBA to the bottom
housing. (See Figure 2-2)
Figure 2-1. Screws (marked with yellow
circles) that secure the housing.
Figure 2-2. Screws (marked with yellow
circles) that secure the main PCBA to
bottom housing.
CAUTION: Observe precaution for handling electrostatic
sensitive devices.