Table of Contents
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TABLE OF CONTENTS
SECTION
1.1
INTRODUCTION ..........................................1-1
1.2
CIRCUIT DESCRIPTION ..............................1-1
1.2.1
Analog Meter Readout ...............................1-1
1.2.2
Front Panel Controls ..................................1-1
1.2.3
Muffle Control ...........................................1-1
1.2.4
Power Supply ............................................1-1
2.1
FACTORY REPAIR........................................2-1
2.2
BEFORE YOU START ...................................2-1
2.3
TROUBLESHOOTING GUIDES ......................2-1
2.3.1
Power Supply ............................................2-1
2.3.2
Analog Circuitry.........................................2-1
2.3.3
Triac Drive.................................................2-1
2.4
TROUBLESHOOTING COMPONENTS ............2-1
2.5
BLOCK DIAGRAM.......................................2-3
2.6
SCHEMATIC ..............................................2-4
2.7
CONTROL CIRCUIT BOARD..........................2-5
2.8
WIRING DIAGRAM .....................................2-6
3.1
SCOPE ......................................................3-1
3.2
FACTORY REPAIR........................................3-1
3.3
ADJUSTMENTS...........................................3-1
3.3.1
Door, Lift Drag Adjustment ........................3-1
3.4
CIRCUIT BOARD CALIBRATION ...................3-1
3.4.1
Required Test Equipment ..........................3-1
3.4.2
Temperature .............................................3-1
4.1
4.2
CIRCUIT DESCRIPTION .............................4-1
4.2.1
LCD Display Readout.................................4-1
4.2.2
Front Panel Control ...................................4-1
4.2.3
Muffle Control...........................................4-1
4.2.4
Power Supply............................................4-1
4.2.5
Motor Drive Control ...................................4-1
4.2.6
Fan Drive Control ......................................4-1
SECTION
5.1
FACTORY REPAIR........................................5-1
5.2
BEFORE YOU START ...................................5-1
5.2.1
Isolating a Problem ...................................5-1
5.3
TROUBLESHOOTING GUIDES .....................5-1
5.3.1
Power Supply ............................................5-1
5.3.2
Microprocessor ........................................5-1
5.3.3
Peripheral Drive ........................................5-1
5.3.4
Motor Drive ...............................................5-1
5.3.5
Analog Circuitry.........................................5-1
5.3.6
Display Board ...........................................5-1
5.3.7
Fan Drive Control ......................................5-2
5.4
TROUBLESHOOTING COMPONENTS............5-2
5.5
ERROR CODES...........................................5-3
5.6
DIAGNOSTIC TABLES .................................5-4
5.7
BLOCK DIAGRAM.......................................5-8
5.8
SCHEMATICS ............................................5-9
5.9
WIRING DIAGRAM ....................................5-12
6.1
SCOPE .....................................................6-1
6.2
FACTORY REPAIR .......................................6-1
6.3
ADJUSTMENT/CALIBRATION .......................6-1
6.3.1
Temperature ............................................6-1
6.3.2
Door, Lift Drag Adjustment ........................6-1
6.4
CIRCUIT BOARD CALIBRATION ...................6-1
6.4.1
Required Test Equipment ..........................6-1
6.4.2
Temperature .............................................6-1
SECTION
SERVICE PARTS
7.1
ORDERING INSTRUCTIONS.........................7-1
7.2
MUFFLE AND THERMOCOUPLE ...................7-1
7.3
MUFFLE (3-550 PD / AIR EXCH)...................7-2
7.4
CABINET PARTS.........................................7-3
7.5
DOOR PARTS ............................................7-4
7.6
A-CONTROLLER PARTS ..............................7-5
7.7
3-STAGE & 3-550 CONTROLLER PARTS........7-6
7.8
LIFT MECHANISM PARTS (3-550PD) ............7-7
SECTION
8.1
CONTROL DRAWER REMOVAL.....................8-1
8.2
TRIAC........................................................8-1
8.3
MEMBRANE SWITCH..................................8-2
8.4
DISPLAY PCB ............................................8-3
8.5
A-CONTROL PCB .......................................8-4
8.6
3 STAGE CONTROL PCB .............................8-5
8.7
DOOR ASSEMBLY/ADJUSTMENT ................8-6
8.8
HEATING PLATES.......................................8-7
8.9
MUFFLE REPLACEMENT........................ .....8-8
8.10
THERMOCOUPLE (A-Control) .....................8-9
8.11
THERMOCOUPLE (3 STAGE) .......................8-9
8.12
MUFFLE REPLACEMENT(3-550 PD)........ ....8-10
8.13
THERMOCOUPLE (3-550PD) ......................8-11
8.14
POWER SWITCH .......................................8-12
8.15
POWER DOOR REPLACEMENT ...................8-13
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Troubleshooting
