Just finished 1st WB O2 need a little help

[rr]

Make sure that your supply voltage is at least 13.0 volts. Check that D5 pin
one (1) is reaching 2.5 V, should be. Then check that R7, either pin, is
reaching your input voltage (13.0 V).

Once D5 pin 1 reaches 2.5 volts that turns on Q1 which applies B+ to the LED
and opto-coupler. Double check that the opto coupler is not in reversed (ISO1).

Can use a 10 ohm, 5W resistor in place of sensor heaterr for testing.

BobR.

A79coupe at aol.com wrote:

> Just trying out my WB O2, and I'm not having sucess.  The output to the
> heater is right on at 10.37v 1.43A, the sensor gets hot as hell, but the LED
> does not come on.  I reversed the leads of the LED, and still it does not
> come on.
>
> Vout remains constant at 2.57v.
>
> Any ideas on how to fix?
>
> TIA
>
> Eric Anderson
> ----------------------------------------------------------------------------
>

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