Name: OHAUS PA153
Brand: OHAUS
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SERVICE MANUAL

Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000

Table of Contents3
Chapter 1 Getting Started11
Introduction11
Service Facilities11
Tools and Test Equipment Required12
Special Tools12
Standard Tools and Test Equipment12
Specifications12
Specifications: External Calibration Models (Includes M Models)12
Specifications: Carat Models13
Specifications: Gold Models (External Calibration)14
Specifications: Gold Models (Internal Calibration)14
Balance Operation15
Overview of the Controls15
Admissible Ambient Conditions15
Overview of the Display Indicators16
Functions of Display Controls16
Display Indicators16
Power on17
Power off17
Menu Setup17
Menu Structure17
The Load Cell18
Connecting the RS232 Interface19
COM 1 Interface Pin Connections19
RS232 Commands20
RS232 Command Table20
Chapter 2 Troubleshooting21
General Procedures for Troubleshooting21
Diagnostic Guide21
Diagnosis21
Error Codes24
Chapter 3 Maintenance Procedures25
Preventive Maintenance25
Preventive Maintenance Checklist25
Opening the Balance25
Variations in Opening Pioneer Models26
Load Cell Removal and Disassembly27
Variations in Pioneer Load Cells27
Disassembly of Precision Balances with Internal Calibration28
Removing Internal Calibration Weights29
Servicing the Internal Calibration Mechanism29
Reassembling the Internal Calibration Mechanism30
Disassembly of Precision Balances with Incal Mechanism30
Removing the Load Cell - Precision Balances31
Proper Manner to Grasp Load Cell When Removing Weight Arm Assembly31
Load Cell Disassembly - Precision Balances32
Service Fixture, Screws and Washers for 150G to 310G Precision Balances32
Precision Load Cell Top33
Position Sensor Board34
Hanger35
Magnets Must be Clean36
Position Sensor Board Removal/Replacement/Adjustment - Precision37
Main Printed Circuit Board (PCB) Replacement - All Balances38
Position Sensor Board38
Load Cell Reassembly - Precision Balances39
Service Fixture for 510G to 4100G Precision Load Cell, Attached to Hanger39
Sideways Motion Stop Plate40
Precision Load Cell Top41
When Position Sensor Board Shows Normal Weight, Tighten Its Screws42
Removing the Incal Mechanism from Incal Analytical Balances43
Removing Internal Calibration Weights and Components43
Bottom Housing with Load Cell, Weight Arms and Weights Removed44
Reinstalling Internal Calibration Components45
Load Cell Removal/Installation - Analytical Balances45
Disassembling Analytical Load Cells46
Shims Are Inserted between the Hanger and the Load Cell47
Vertical Flexure and Screws, Lock Plate, Washers, and Bushings, Removed48
Hanger with Two Screws49
Contact Board with 3-Wire Ribbon Cable Soldered to It50
A Screw Connects the Contact Board to the Load Cell51
Position Sensor PC Board Removal/Replacement/Adjustment - Analytical52
Installing the Magnet Half54
Insert Shims between the Hanger and the Load Cell on both Sides55
Analytical Incal Load Cell with Top Bracket Visible56
Reassembling Analytical Load Cells57
When Position Sensor Board Shows Normal Weight, Tighten Its Screws57
Block Style Load Cell58
Block Style Load Cell Removal & Replacement59
Progressive Disassembly of Block Style Load Cells59
Internal Calibration Testing60
Incal Motor Removal & Replacement60
Incal Mechanism Removal61
Incal Mechanism Installation62
Removing Position Sensor63
Removing the Block Style Load Cell from the Base Plate64
Installing the Block Style Load Cell on the Base Plate65
Removal and Installation of the Block Style Load Cell PC Board66
Load Cell PCB-Temperature Sensor-Position Sensor Assembly67
Removing the Ratio Beam on Block Style Load Cells68
Contact Board with Cover Holder off69
Weight Arm Screws and Washers Removed70
Aluminum Sleeves Removed71
Installing the Ratio Beam on Block Style Load Cells72
Ratio Beam Vane Slotted Area73
Installing the Incal Weight Arm74
Centering Pins in Ratio Beam75
Installing the Load Cell PCB-Temperature Sensor-Position Sensor76
Position Sensor on the Magnet77
Setting the Up/Down Stop Screw on Block Style Load Cells78
Chapter 4 Testing79
Test Masses Required79
Operational Test79
Segment Display Test79
Performance Tests80
Precision Test80
Tolerances - Precision Models80
Tolerances - Analytical Models80
Off-Center Load Test81
Off-Center Load Adjustment for Precision Models82
Off-Center Load Adjustment for Analytical Models83
Off-Center Load Adjustment for Block Style Models84
Repeatability Test85
Repeatability Worksheet86
Linearity Test87
Load Cell Assembly91
Analytical Balance: Housing & Internal Parts99
Precision Load Cell100
Analytical Load Cell102
Block Style Incal Load Cell & Parts104
Appendix A STANDARD CALIBRATION Calibration107
Calibration Masses107
Span Calibration107
Linearity Calibration108
Appendix B SERVICE CALIBRATION109
Entering the Service Menu109
Ramp110

OHAUS PA153 User Manual

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OHAUS PA153 Specifications

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Brand	OHAUS
Model	PA153
Category	Scales
Language	English