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Hello,

I have a home irrigation controller hat has gone faulty on one of the zones, I have opened it up and have found one of the transistors to be faulty there is a number on the transistor but it looks like its a part number from the manufacturer of the irrigation unit rather then the actual part number of the transistor.

The number written on it is 1401ES or 1401E5 cant make out if its a 5 or an S but looks like an S to me and sound like it might be an NPN transistor.

The purpose of this transiston from what I can tell from the board is to turn a solenoid on and off.

The Irrigation unit is made by Holman Distributors.

Any help you can provide would be greatly appreciated.

Thanks Imran Khan

Reply to
Imran
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Have you contacted the manufacturer?

H. R. Hofmann

Reply to
hrhofmann

Have you contacted the manufacturer?

H. R. Hofmann

Reply to
hrhofmann

Have you contacted the manufacturer?

H. R. Hofmann

Reply to
hrhofmann

Have you contacted the manufacturer?

H. R. Hofmann

Reply to
hrhofmann

Have you contacted the manufacturer?

H. R. Hofmann

Reply to
hrhofmann

Determine its gender than select one that will work. Check the working ones too - I have a solenoid irregation system and it uses traics to swtich the 24 volts AC to the valves. Cheaper and easier to apply triacs so you may have the same thing.

Measurements on the good ones may tell you if it is a bipolar, darlington, scr or triac.

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Reply to
default

answer is always the same: look at the circuit and work out what specs you would need in a replacement, then get one that meets them.

NT

Reply to
meow2222

I was thinking the same thing. If one can't tell from the part number what it is, the "faulty transistor" could just as easily be something else, and not even faulty. (Especially given we get a wide range of people asking here, and often they "know" what's wrong even though there's no indication of how they came to that conclusion.)

The numbers strike me as house numbers, and given that conclusion, one does have to trace out the circuitry to get an idea of what they are.

Michael

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Reply to
Michael Black

snipped-for-privacy@att.net wrote in news:1156223179.566743.130840 @p79g2000cwp.googlegroups.com:

Oh gosh, you posting this same sentance 5 times in a row helped the OP at least 5 times more than he hoped for. Such good advice.

--
~Ohmster
Reply to
Ohmster

2SA1401 2SB1401 2SC1401 2SD1401 2SK1401 2N1401

all get hits using google.

Graham

Reply to
Eeyore

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