OHAUS Explorer Balances - 2.3 DIAGNOSTIC GUIDE

CHAPTER 2 - DIAGNOSTIC GUIDE
Explorer
®
Series Service Manual 17 Ohaus Corporation www.ohaus.com
Diagnosis:
1. Isolate and identify the symptom.
2. Refer to Diagnostic Guide tables 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.
TABLE 2-1 DIAGNOSTIC GUIDE
Symptom
Possible Cause
Remedy
Cannot turn on
Cannot exit Standby Mode, possible
software lock-up.
Cycle the power off then on.
No power to the Adapter
Verify input voltage to the Power Adapter.
Bad Power Adapter
Verify the Power Adapter output voltage
using a DVM.
Input Jack or internal wiring is defective.
Verify 12VAC at the Power Jack wire
connection to the PCB.
Bad connection between terminal and
base
Re-connect base and terminal
Defective Base Main PCB
Replace base Main PCB, see Section
3.4.2
Touch Panel
controls do not
respond
Software lock-up
Cycle the power off then on.
Touch Panel defective
Replace, see Section 3.6
Bad touch panel calibration
Enter main menu to re-calibrate touch
panel, see Appendix A.
Defective Terminal Main PCB
Replace Terminal Main PCB, see Section
3.4.1
Incorrect weight
reading
Improper calibration
Perform span calibration
Poor linearity performance
Perform linearity calibration
Unstable environment- vibration, air
currents or changing temperature
Move balance to suitable location, allow
balance to stabilize its temperature
Internal mechanical interference
Verify the pan Support is not contacting
the top housing
Bad load cell
Replace load cell
Poor
repeatability
Internal mechanical interference
Verify the pan Support is not contacting
the top housing