OHAUS EC Series, Service Manual

Page: 7 / 56

1-1
CHAPTER 1 INTRODUCTION
1. INTRODUCTION
This service manual contains instructions for the diagnosis and repair work to be performed by Ohaus
Dealers or Ohaus authorized service centers. Knowledge of the operation of the Scale is assumed.
Instruction manuals may be required with this service manual. For complete information on operation,
refer to the Instruction Manual.
This manual covers maintenance on the following:
EC Series Scales, Models EC3, EC6, EC15 and EC30
The contents of this manual are contained in five chapters and and two Appendixes with service menu and
calibration instructions.
Chapter 1 Introduction - Contains information about service facilities, tools, test equipment, test masses,
and service strategy.
Chapter 2 Diagnosis - Contains information on problem verification, scale examination, preliminary
checks and troubleshooting tables.
Chapter 3 Testing - Contains testing procedures, an interconnection diagram, performance tests, battery
tests, specifications and calibration.
Chapter 4 Repair Procedures - Contains detailed repair procedures for all major components.
Chapter 5 Parts Lists - Contains overall views identifying all major serviceable replacement components
with associated parts lists.
Appendix A Service Modes - Contains Capacity and Readability for the EC Series Scales in a service mode.
Appendix B Service Calibration - Contains Service Calibration instructions.
1.1 SERVICE FACILITIES
The service area should be a stable environment.
The bench area should be clean and should contain an antistatic mat with a personnel-grounding clip
to protect internal circuit boards. The ideal electrical power source for the scales should be a dedicated
line to avoid sudden fluctuations or voltage drops caused by external equipment drawing heavy current.
The service area for the scales should be away from direct sunlight, overhead heating or air conditioning
ducts, magnetic fields such as motors, large transformers or vibrating sources such as machinery.
The power outlet should be grounded for safety. Sufficient space should be provided around the scale as
not to be affected by other equipment. This will ensure that the scale is operated under ideal conditions.