Table of Contents
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CONTENTS
1.
INTRODUCTION .................................................................................................................... 7
1.1.
PURPOSE..................................................................................................................................... 7
1.2.
PRESENTATION ........................................................................................................................ 7
SPECIFICATIONS................................................................................................................................... 8
1.2.1.
Dimensions and weight ............................................................................................................................8
1.2.2.
Electrical Specifications...........................................................................................................................8
1.2.3.
Performance .............................................................................................................................................8
1.3.
INSTALLATION PROCEDURE............................................................................................... 9
2.
THEORY OF OPERATION .................................................................................................. 10
2.1.
DESCRIPTION.......................................................................................................................... 10
2.2.
COMPONENT LAY-OUT........................................................................................................ 10
2.3.
MOTOR CONTROL PRINCIPLE.......................................................................................... 12
2.3.1.
Introduction ............................................................................................................................................12
2.3.2.
The motor...............................................................................................................................................12
2.3.3.
Power control .........................................................................................................................................13
2.4.
ELECTRONICS - STRUCTURE............................................................................................. 15
2.4.1.
Introduction ............................................................................................................................................15
2.4.2.
Microprocessor + Power pcb..................................................................................................................15
2.4.3.
Imbalance sensor....................................................................................................................................16
2.4.4.
Tacho sensor...........................................................................................................................................16
2.4.5.
Temperature sensor (RT3) .....................................................................................................................16
2.4.6.
Refrigeration control board (RT3) .........................................................................................................16
2.4.7.
Input - Output.......................................................................................................................................17
3.
DIAGNOSTICS AND REPAIRS........................................................................................... 18
3.1.
INTRODUCTION...................................................................................................................... 18
3.2.
FUNCTIONAL TEST ............................................................................................................... 18
3.2.1.
Eprom version ........................................................................................................................................18
3.2.2.
Test mode ...............................................................................................................................................18
3.3.
FAULT CODES ......................................................................................................................... 21
3.4.
TROUBLESHOOTING CHART............................................................................................. 22
4.
REPLACEMENT PROCEDURES ....................................................................................... 24
4.1.
MOTOR REPLACEMENT ...................................................................................................... 24
4.1.1.
VENTILATED model - T3 ....................................................................................................................24
4.1.2.
Refrigerated model RT3........................................................................................................................26
4.2.
IMBALANCE DETECTOR REPLACEMENT ..................................................................... 27
4.3.
REPLACEMENT OF THE LID LOCK ASSEMBLY........................................................... 27
4.4.
LID LOCK ASSEMBLY ELEMENT REPLACEMENT...................................................... 28
4.4.1.
Lid lock microswitch replacement .........................................................................................................28
4.4.2.
Lock solenoid microswitch replacement ................................................................................................28
4.4.3.
Solenoid replacement .............................................................................................................................29
4.5.
POWER SUPPLY RACK REPLACEMENT ......................................................................... 29
4.5.1.
Dismounting...........................................................................................................................................29
4.5.2.
Refitting .................................................................................................................................................29
4.5.3.
Refrigeration board (RT3 ) replacement ................................................................................................29
Service Manual 11290099
page 5 of 44
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