just to let you remember , my board is tachus 3 axis board.
I checked the board and found that electrolytic capacitors were installed backward. I substituted them and did the test.
I will list here my troubleshooting results and tell me what is my problem:
1-With no power on , I got 4.40 Kohm between Ground and 5V
2-power on , with no ICs installed , I got 5v from voltage regulator and 5v at each IC power pin(test was done IC after another).the same after installing the ICs.
3-power on and ICs installed , probing the ICs gives the following results:
IC1 74HC14 :
pins 1,3,5,9,11,13,14 Hi (Led Bright)
pins 2,4,6,7,8,10,12 Low(Led Off)
IC3 ,IC4 (CD4030)
pins 1,3,4,6,11,12,14 Hi
pins 1,3,5,6,11,12,14 Hi
pins 1,5,9,12,14 HI
pins 1,9,13,14 HI
(Note : why IC7 readings are different from IC5 and IC8. the same for IC6 and IC3,IC4)
So please tell me what is the problem , the motors turn as a pendulum , right and left , an sometimes whizz and don't turn .
Last edited by shreifali
on Mon Apr 14, 2008 2:12 am, edited 1 time in total.