wbo2 testing question

[Steve.Flanagan at VerizonWireless.com]

Here is a quick way to test your led.

Using a power supply or battery -  apply gnd to the pin on the LED that you
have going to ground - from memory I believe it is J4.

Then Choose a resistor so you get about 10mA through the led.  Connect the
resistor (figure about a 1.2K ohm resistor should work fine with 12V) to the
Positive side of the power supply, now touch the other side of the resistor
to the open (no gnd) pin on the LED, if it lights you have it in correct.

If you look at the LED, inside the LED are two hunks of semiconductor, one
is much larger then the other, the Anode is the larger hunk (this is also
the shorter lead - before you cut it), the Anode is connected to Ground (or
negative contact).

sf

-----Original Message-----
From: Stephen Andersen [mailto:SAndersen at advan-tek.com]
Sent: Wednesday, December 26, 2001 9:42 PM
To: 'diy_efi at diy-efi.org'
Subject: RE: wbo2 testing question


Are you saying that if you power the circuit with nothing hooked
up that the LED will come on in 10 secs?  I have not tried powering
it without a load on the heater circuit.  With a 3.1ohm lamp
the LED did not come on even after about 75 seconds.

I am getting about 6 volts (open circuit) at the heater outputs
with 14 volt input.  That sounds kind of low isn't it?

Anybody got any ideas or recommendations on how to check the circuit
thoroughly (for an electronics idiot) after construction but prior
to connecting the sensor?  I really don't want to smoke $120...

On the ISO is the dot (pin 1) supposed to be in the top left corner
when looking at it on the board with the heater circuit in the top
left?

How about the LED?  Not sure that I put it in the right way...

Thanks,
Steve


> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of rr
> Subject: Re: wbo2 testing question
> 
> Yes, the dot is pin 1 on iso1. Without a sensor hooked up the heater
> ready LED should come on within 10 seconds. Then J8 will move
> from 2.5 V.
> 
> BobR.
> 
> 
> 

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