CHAPTER 3 MAINTENANCE PROCEDURES
MB23 and MB25 Service Manual
3-15
Ohaus Corporation www.ohaus.com
3.9 INSTALLING THE TOP HOUSING
1. Stand the Top Housing up at the
back of the Bottom Housing, so the
cables from the heater unit can be
plugged in. (See Figure 3-37.)
2. Insert the connectors for the Fan and
Temperature Sensor on the left, and
the Thermal Overload Device and
ground cable (for the MB23) on the
right, as shown.
Figure 3-37. Connecting cables to the
Power PCB.
3. Install the Top Housing.
4. Double-check that the grommet seal
in the center of the Top Housing
rests smoothly. If it is twisted, reopen
the Housing to set it straight.
Otherwise the display will show
Err
8.3
on power up.
5. Insert the three screws to secure the
top housing. (See figure 3-38.)
6. Place the small plug over the front
screw after tightening it, as shown.
Figure 3-38. Placing Plug on Top Housing.
7. If the Protective Glass on the MB25
was removed or replaced, install it as
follows:
8. Place the Protective Glass in the
groove in the Heater Frame Housing
in front of the Heater.
9. Then place the retainer clips and
screws in the holes provided to
secure the glass. (See Figure 3-39.)
Figure 3-39. Installing Protective Glass.
