GD100/GD120
Contents
1 Introduction
1.1 General 4
1.2 Advice on Servicing 4
1.3 Cautions and Warnings 4
1.4 Electrical Safety 4
1.5 Connection to AC power supply
2 Specification Summary
3 Brief Mechanical Description
4 Description of Operation
4.1 AC Power Distribution and
Component Interconnections 7
4.2 DC Power Supplies 7
4.3 Temperature Measurement and Control. 7
4.4 Temperature Measurement
4.5 Temperature Control. 8
5 Fault Finding
5.1 Test equipment and tools required: 9
5.2 Initial Tests. 9
5.3 Fault Diagnosis. 9
6 Removal and Access
6.1 Tools Required 12
6.2 Removal of Cover 12
6.3 Removal of front panel assembly 12
6.4 Removal of Display PCB. . 12
6.5 Removal of PSU PCB. . 12
6.6 Removal of Heater. 12
6.7 Removal of Probe. 12
6.8 Removal of Float Switch.
6.9 Removal of Float and Float Shaft. 13
6.10 Removal of GD120 Motor. 13
6.11 Removal of GD100 Motor 13
6.12 Replacement of Over temperature
Cut-out GD120 only.
7 Setting Up and Testing 14
7.1 Test Equipment required 14
7.2 Functional Tests 14
7.3 Setting up DAC output 14
7.4 Heater Control
7.5 Calibration 15
7.6 Store Calibration Figures 15
7.7 Accuracy Check 15
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See Fig 7
See Fig 8
See Figs 9 & 10
See Figs 11 & 12
See Fig 13
See Fig 14
See Fig 15 13
See Fig 16
See Figs 17 & 18
See Figs 18 & 19
See Fig 20 14
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Part No. 17592/Issue 1 July 2002
Page 2
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