Bosch NGP73, Service Manual, Page: 3 / 34

TABLE OF CONTENTS
TITLE PAGE
FEATURES OF COOKTOP................................................................................................1
30” Models ...................................................................................................................1
36” Models ...................................................................................................................1
COOKTOP OPERATION ...................................................................................................2
Sealed Burners ......................................................................................................2
Burner Caps...........................................................................................................2
Burner Grates ........................................................................................................2
Burner Control Knobs ............................................................................................2
Electronic Ignition/Reignition .................................................................................3
Typical Flame Characteristics................................................................................3
Power Failure.........................................................................................................3
Replacing the Maintop ...........................................................................................4
Replacing a Burner Base & O-Ring .......................................................................6
Replacing an Ignitor...............................................................................................7
Replacing a Gas Valve & Spark Switch.................................................................8
Replacing the Spark Module................................................................................10
Replacing a Jet Holder ........................................................................................12
Replacing the Gas Pressure Regulator ...............................................................14
TROUBL
E
SHOOTING ......................................................................................................15
THEORY OF OPERATION ........................................................................................15
The Gas Distribution System ...............................................................................15
Principles of the Isophording Gas System...........................................................16
Isophording Sealed Gas System .........................................................................16
How to Measure Gas Pressure............................................................................17
T
he Gas Pressure Regulator .............................................................................
.
.18
Manifold and Gas Values.....................................................................................18
Testing a Gas Pressure Regulator ......................................................................19
Gas Valve Operation ...........................................................................................20
Gas Valve Bypass Screw ....................................................................................20
Orifices.................................................................................................................21
The Injector Sleeve..............................................................................................22
Burner Assembly .................................................................................................23
Spark Switch........................................................................................................24
The Spark Ignitor (Electrode)...............................................................................25
Spark Module.......................................................................................................25
The Gas Pressure Regulator ...............................................................................26
Troubleshooting Chart B ............................................................................................27
Wiring Diagram ..........................................................................................................28