ViewSonic PJD6211P Service Manual page 31

Note: Swapping modules that may be defective with others known to be good is generally an ideal way to
find the module responsible for the problem. A failure symptom is rarely caused by more than one module,
so you will not usually need to replace more than one to correct a particular failure. Whatever main board,
ballast, IR board, power board, lamp module or optica l engine are all suitable to check by swapping
modules.
28
ViewSonic Corporation Confidential - Do Not Copy PJD6211