OHAUS Valor 1000W, Service Manual

Page: 13 / 44

CHAPTER 2 DIAGNOSTIC GUIDE
Valor
™ 1000W Series Service Manual
2-1 Ohaus Corporation www.ohaus.com
2.1 TROUBLESHOOTING
This section of the manual contains troubleshooting information. Information is contained to
isolate specific problems using Table 2-1, Diagnostic Guide. Follow all directions step by step.
Make certain that the work area is clean. Handle scale components with care. Use appropriate
Electro-Static Device.
2.2 DIAGNOSTIC GUIDE
Table 2-1 is a Diagnostic Guide designed to help locate the problem area quickly and easily.
The probable causes are listed with the most common cause first. If the first remedy does not
fix the problem, proceed to the next remedy. Before attempting to repair the scale, read all
chapters of this manual to be familiar with the scale components and operation.
2.2.1 Diagnosis
1. Isolate and identify the symptom
2. Refer to Table 2-1, Diagnostic Guide and locate the symptom.
3. Follow the suggested remedies in the order they appear.
4. Perform the indicated checks, or see the appropriate section of the manual.
5. Repair or replace the defective section of the balance.
NOTE: If more than one symptom is observed, approach one area at a time,
and remember that the symptoms may be interrelated.
If a problem arises that is not covered in this manual, contact Ohaus Corporation for further
information.
2.2.2 Checking Load Cells for Trouble
1. Visual Check:
– Clean the unit before evaluating any mechanical problems. In some cases,
debris may have accumulated inside the Housing. Make sure there is no buildup
of any foreign material.
– Examine the unit for bent Frame or signs of physical abuse that could cause it to
malfunction. Replace all damaged parts. See Chapter 5 for parts identification.
– Check that the Down Stops are not touching the Frame. This would restrict
movement, causing improper operation. If the Down Stops are improperly set,
adjust them. (See Section 3.6.)
– Check the cables leading to the Load Cell for cuts, abrasions or other signs of
excessive wear and tear.
– Check for a bent or twisted Load Cell:
Place the top surface and then each of
the sides of the Load Cell on a flat surface, to see if it rests flat and even.
A gap indicates a bent or twisted Load Cell. A Load Cell that is even slightly bent
or corroded should be replaced.
– Examine the Load Cell for corrosion due to high humidity or exposure to
chemicals.