CHAPTER 2 – TROUBLE SHOOTING
MB90 MB120 Series Service Manual
27
Ohaus Corporation www.ohaus.com
CHAPTER 2 – TROUBLE SHOOTING
2.1 Trouble shooting
This section of the manual contains troubleshooting information. To isolate specific problems,
use Table 2-1, Problem Solver. Follow all directions step by step. Make certain that the work
area is clean. Handle scale components with care. Use appropriate Electro-Static Device.
2.1.1 General Procedures for Troubleshooting
1. Do the most obvious, user-level remedies.
2. Check that internal parts are clean and free of debris.
3. Use the Problem Solver (Table 2-2) to locate the symptom.
Follow the suggested remedies in the order they appear.
4.
Visual Check:
Examine the Load Cell for signs of bending, twisting or corrosion.
– Clean the unit before evaluating any mechanical problems.
Remove any debris inside the Housing.
– Check condition of Keypad and Display, Dryer Unit with protective glass,
Halogen Radiator, Reflector, Fan Grill, Leveling Feet, Rating Plate.
– Examine the Housing for dents, bent Pan, Pan Support, Draft Shield or Heat
Shield or signs of physical abuse.
– Replace all damaged parts. See Chapter 5 for parts list.
– Check the cables leading to the PCBs for cuts, abrasions or other signs of
excessive wear and tear.
– Examine the Load Cell for corrosion due to high humidity or exposure to
chemicals. A Load Cell that is even slightly bent or corroded should be replaced.
In the event of erratic or fluctuating weight readings, isolate the problem to either the
mechanical or the electronic area of the Moisture Analyzer.
If a problem arises that is not covered in this manual, contact Ohaus: www.ohaus.com.
