IGT Ballast

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Common Problems

Q1 Tip31C Replaced with NTE291

Q2 Tip31C Replaced with NTE291

Q1 & Q2

TIP31C

Cross Ref

NTE291 (NPN) & NTE292 (PNP)
Silicon Complementary Transistors
Medium Power Amp, Switch

Also C3 will be bad - 333k 250v replaced with 333k 400v

Sometimes you will also find C4 bad

103k 400v replaced with 103k 400v

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This one had a bad Cap - C1 470uf 50v also had to replace Q3 Tip41C - Q4 Tip41C -

and  F1 the  4 amp fuse was blown.

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                                                       AC PLUG for Wall outlet

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