TCI repair

[garyS-NJ]

isolated my no ignition advance problem to my TCI: I tried someone elses TCI and it didn't fire number 2 (that was his problem) but it ran pretty good and didn't backfire out carbs as I reved it. horaay. so I opened it up and he pointed out the diodes her replaced. Mine were disintegrating.. I've read that will kill the TCI but my bike does idle nice and I figure I should try to repair this tci... I also read that any 1N400X diode will replace the 1N4009. Is that a definite reliable fix? going to radio shack

[dingy]

That is correct.

 

I think 1N4001 is the recommended as it has lowest voltage rating of series. Any of the others will work just as well.

 

If your diodes have failed, TCI may be beyond repair though.

 

Gary

[garyS-NJ]

Oops. I figured I should get higher reverse voltage and higher current diodes. Bought 1.5amps at 1000v and 3 amps at 200v hoping to fit the 3amp diodes in....

[garyS-NJ]

The reverse voltage is a breakdown limit.. right?

[garyS-NJ]

I figured as a rectifier, the forward current is the max conducting current so 1 amp or higher should do.. the higher amp diodes were larger for more heat dissipation.. and the higher breakdown voltage could only be a safety margin on breakdown... so I can put in the 1.5A 1000V diodes (IDK generic P/N), or the 3amp 200PIV diodes (1n5402), otherwise I bought a variety pack of their little 1amp diodes.. I'm desoldering now and seeing what I can fit (biggest body, 3amps I'd think unless switching time is an issue). the 1N4009 capacitance is 4pf. the 4001 thru 4004 capacitance is 15pf and the 4005- 4007 is 8pf. I think the lower capacitance would switch faster??