My WB refuses to work....

[bcroe at juno.com]

It would be safer to get the tests to pass before connecting
the sensor.

You say there is 13.15v from J12 to batt (-).  That's not possible
with proper connection.  J12 should be connected to batt (-), as 
well as J4.  Also batt + (14 volts) should be connected to J11 and
J3.  Try this (without sensor) and see if you get about 8 volts across
C6.  Then look for 4 volts on J7 and 2.5 volts on J9, both measured 
relative to J12.  If so you are looking good, so rerun all the electrical

tests.

good luck, Bruce Roe

On Thu, 28 Feb 2002 01:22:39 -0500 "TROYXTROY" <TROYXTROY at cox.net>
writes:
>  I did the tests mentioned in the Dummy's Guide to Building 
> a WB web page and the heater circuit  checked out ok.  
> When i tried the tests mentioned for the servo 
> circuit, things didn't check out at all.  


> Some of my testing showed the following:
> 
> With the one end of the 100ohm resistor on J7 and the other on J5&6, 
> i'm getting approx. 12.5v from J7 to J12.  i should be seeing 
> approx.  4v.  
> 
> These tests were performed with the sensor connected:
> car bat voltage = 14v
> led: on
> sensor: hot
> J8 to J12 = 0v
> Bat(-) to J8 = 12.6v
> Bat(-) to J12 = 13.15v
> J6 to J12 = -.006v
> J6 to Bat(-) = 13.13v
> J6 to J7 = -.006v
> J5 to J7 = .001v
> J5 to Bat(-) = 13.5v
> Cathode side of D9 to J8 = -.373v


> -Troy

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