Getting Started - OHAUS NV212 Service Manual

1 GETTING STARTED

1.1 INTRODUCTION
This service manual contains the information needed to perform routine maintenance and service
on the Ohaus Navigator Series scales. Familiarity with the scale's Instruction Manual is assumed.
The contents of this manual are contained in five chapters:
Chapter 1 Getting Started – Contains information on service facilities, tools, specifications, and
the mechanical and electronic functions of the scale.
Chapter 2 Troubleshooting – Contains a diagnostic guide and error code table.
Chapter 3 Maintenance Procedures – Contains preventive maintenance procedures and
disassembly, repair and replacement procedures.
Chapter 4 Testing – Contains a list of required test masses, an operational test, segment display
test, performance tests and adjustments.
Chapter 5 Drawings and Parts
all serviceable components.
Appendix A Standard Calibration – Explains procedures for Standard Calibration, performed
prior to using a scale, and after service.
Appendix B Service Calibration – Describes the Service Menu and sub-menus, which allow
authorized service personnel to perform factory Linearity and Span calibrations (no pre-set limits),
take Ramp readings, adjust the GEO Factor, and use E.PAnd to temporarily increase readability to
th
at least 1/10 of the standard readability.
Appendix C Software Service Tool Instructions – Used to re-configure the scale after replacing
a Printed Circuit Board.
Appendix D Geographical Adjustment Values
geographical latitude away from the equator (in degrees and minutes) and every elevation above
sea level (in meters or feet).
1.2 SERVICE FACILITIES
To service a scale, the service area should meet the following requirements:

Should be temperature controlled and meet scale specifications for temperature environmental
requirements.

Must be free of vibrations such as fork lift trucks close by, large motors, air currents or drafts
from air conditioning/heating ducts, open windows, people walking by, fans, etc.

Area must be clean and free of excessive dust.

Work surface must be stable and level.

Scale must not be exposed to direct sunlight or radiating heat sources.

Handle all electronic assemblies with appropriate Electro-Static protection.
Navigator Series Service Manual
– Contains exploded views of Navigator scales identifying
Lists
– The chart of scale settings for every
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CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com