Unstirred water bath SAP, JBA, JBN Service Manual (Version 2.0) July 2014
31667 Page 2 of 23
Contents
1 Introduction ........................................................................................................................3
1.1 Service Address ...........................................................................................................3
1.2 Servicing Advice .........................................................................................................3
1.3 Cautions & Warnings ..................................................................................................3
1.4 Electrical Safety ..........................................................................................................3
2 Product Description ............................................................................................................4
2.1 SAP, JBA & JBN range ..............................................................................................4
2.2 Basic Description ........................................................................................................4
2.3 Dismantling a unit .......................................................................................................6
2.3.1 Removing the base plate ...................................................................................... 7
2.3.2 Removing the tank, heater and probe assembly................................................... 8
2.3.3 Removing the PCB assembly ............................................................................ 10
2.3.4 Removing the front panel membrane keypad .................................................... 10
2.4 Reassembling the unit ...............................................................................................10
2.5 System Schematic & Interconnect Diagram .............................................................11
3 Common service tasks ......................................................................................................12
3.1 Resetting the Over Temperature Cut-out ..................................................................12
3.2 Replacing a tank, heater and probe assembly ...........................................................12
3.3 Replacing the fuses....................................................................................................13
3.4 Replacing Control and Display PCB .........................................................................13
4 Fault Diagnostics and Test ...............................................................................................14
4.1 Test Equipment & Tools Required ...........................................................................14
4.2 Testing and Fault finding ..........................................................................................14
4.2.1 Test/fault-finding flowchart ............................................................................... 15
4.2.2 Useful values for fault finding ........................................................................... 17
4.3 Final Tests – Electrical Safety ...................................................................................17
4.3.1 Check Earth Connection .................................................................................... 17
4.3.2 Check Insulation ................................................................................................ 17
4.4 List of display messages ............................................................................................18
4.4.1 Operating Messages ........................................................................................... 18
4.4.2 Fault/Diagnostic Messages ................................................................................ 18
5 Service Parts .....................................................................................................................19
6 Other Technical Documentation .......................................................................................22
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