OHAUS EXPLORER Service Manual Download

Page: 6 / 114

TABLE OF CONTENTS (Cont.)

3.1.19 Monoblock Load Cell Removal from High Capacity Top Loader

Balance ........................................................................................ 3-14

3.1.20 Calibration Motor Removal from High Capacity Top Loader

Balance ........................................................................................ 3-14

3.1.21 Position Sensor Assembly Removal from Monoblock in High

Capacity Top Loader Balance ...................................................... 3-15

3.1.22 Installing the Position Sensor Assembly for Monoblock High Capacity

High Capacity Top Loader Balance .............................................. 3-15

3.1.23 Removing the Force Coil Lever assembly from Monoblock in

High Capacity Top Loader Balance .............................................. 3-15

3.1.24 Installing the Force Coil Lever Assembly in Monoblock in High

Capacity Top Loader Balance ...................................................... 3-16

3.1.25 Installing Monoblock and Assembling Position Sensor for High

Capacity Top Loader Balance ...................................................... 3-16

3.1.26 Changing Servomotor on High Capacity Top Loader Balance ..... 3-17
3.1.27 Vertical Stop Adjustment for Monoblock in High Capacity Top

Loader Balance ............................................................................ 3-18

3.2 Replacement of Major Components ...................................................... 3-19

3.2.1 Analytical Balances Main Printed Circuit Board (PCB) ................. 3-19
3.2.2 Analytical Balance Position Sensor PC Board ............................. 3-21
3.2.3 Precision Top Loader Balances Main Printed Circuit board (PCB)3-21
3.2.4 High Capacity Top Loader Balance Main Printed Circuit Board (PCB)

and Power Supply (PCB) .............................................................. 3-23

3.2.5 High Capacity Top Loader Balance Connector Printed Circuit

Board (PCB) ................................................................................. 3-24

3.2.6 Removing the Display Module on Explorer Precision Top Loader

Balances ....................................................................................... 3-24

3.2.7 Removing the Display Module on Explorer High Capacity Top

Loader Balances ........................................................................... 3-25

3.2.8 Display Printed Circuit Board ........................................................ 3-26
3.2.9 Membrane Switch Replacement ................................................... 3-27
3.2.10 Replacing the Display ................................................................... 3-28
3.2.11 Removing the Display Module Voyager and Explorer Pro Models 3-29
3.2.12 Display PCB/LCD Assembly Replacement .................................. 3-30
3.2.13 Bulb Replacement ........................................................................ 3-31

CHAPTER 4 TESTING

4.1 Testing

.......................................................................................... 4-1

4.1.1 Operational Test ............................................................................. 4-1

4.1.1.1 Segment Display Test ....................................................... 4-1

4.2 Performance Tests All Balances ............................................................. 4-2

4.2.1 Precision/Repeatability Test ........................................................... 4-2
4.2.2 Off-Center Load Test ....................................................................... 4-2
4.2.3 Linearity Test .................................................................................. 4-8
4.2.4 RS232 Communication Test ........................................................... 4-9