Re: black widow pcb problem no play no picture clock working

  Sounds good just one stupid question. How do I reset the system with
the reset pins?. Are you talking about the pins in the dash lined box?
Thanks,
Dan Piraino

peter jones wrote:

>o.k. the problem is at the very start of the por circuit,
>
>before entering pin3 of F7
>
>normally pin3 of F7 should be high, only going low to do a reset.
>
>not much to cause this, just diode cr3(1N914/1N4148) and R8 (TLO82)
>
>as a test, remove one end of cr3,
>then lift the end of R71 that goes to pin1 of the chip and connect it to pin2.
>
>that will isolate the por and give you a 1k pullup on the reset line.
>then you can reset the system with the reset pins and watch what happens to the reset pin at the cpu.
>
>this should either start the game or if there is more problems it should make the reset-pin pulse at the cpu.
>
>if it does then replace the chip(tlo82) and the diode.
>
>---------------------------------------------------------------------------
>** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
>** Please direct other questions, comments, or problems to chris@westnet.com
>
>
>
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Sat Aug 6 22:50:22 2005