transistor
 

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

transistor
 

Imran wrote:
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

Have you contacted the manufacturer?

H. R. Hofmann

transistor
 

Imran wrote:
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

Have you contacted the manufacturer?

H. R. Hofmann

transistor
 

Imran wrote:
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

Have you contacted the manufacturer?

H. R. Hofmann

transistor
 

Imran wrote:
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

Have you contacted the manufacturer?

H. R. Hofmann

transistor
 

Imran wrote:
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

Have you contacted the manufacturer?

H. R. Hofmann

transistor
 

On Mon, 21 Aug 2006 20:39:09 +1000, "Imran"
wrote:

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


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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transistor
 

Imran wrote:

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.

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

transistor
 

default ) writes:
On Mon, 21 Aug 2006 20:39:09 +1000, "Imran"
wrote:

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


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.

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



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



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transistor
 

transistor
 

Imran wrote:

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.

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

all get hits using google.

Graham