[Wbo2] problem with heater circuit

[bcroe at juno.com]

When you apply power (at least 13 volts), you should 
observe 1.25 volts across the big 1 ohm R4.  The 
voltage across J1-J2 should start around 4 volts and 
rise over half a minute to 10.2 volts.  At than point 
this voltage will stabilize, and the voltage across R4 
should gradually decrease 5 % to 10%.  If it doesn't 
decrease, add some 15 ohm 1/4 watt resistors in 
parallel with R4 to get near 10%.  

If you haven't already, add the heater ckt anti oscillation 
capacitor, any .01 to .1 cap connected to D5 pins 1 & 3.  

Bruce Roe


28 Jun 2005  "onome omene" <onomeomene at hotmail.com> writes:
> i am having problems with my heater circuit. i performed all the 
> check on 
> the website and everything checks out, until i get to the heater 
> circuit. As 
> soon as i power up the circuit the led comes on in step 34. The 
> voltage 
> instantly drops to -3.4 volts, would that mean that my c10 is no 
> good?, not 
> holding charge? and step 36 nothing happens
> also is there anyway for me to get all of the archieved posts?

> Onome Omene