Hi;
I almost have my Defender completely repaired - ALMOST!
It does a very strange thing, sometimes, not all the time, it will add credits by itself! Either the game could be just sitting there or during game play but you will hear the credits adding up. I watched it and it will add 4 credits every 3 seconds, exactly every 3 seconds.
I probed IC24 (4049) on the ROM PCB pins 4,6 and 10 when this is occurring and that is not the cause of the credits.
I probed IC22 (PIA) and pins 29,30 and 31 are always pulsing - is this correct? As I am new to this level of troubleshooting, I really do not know what to expect.
Thanks in advance
Jeff
I almost have my Defender completely repaired - ALMOST!
It does a very strange thing, sometimes, not all the time, it will add credits by itself! Either the game could be just sitting there or during game play but you will hear the credits adding up. I watched it and it will add 4 credits every 3 seconds, exactly every 3 seconds.
I probed IC24 (4049) on the ROM PCB pins 4,6 and 10 when this is occurring and that is not the cause of the credits.
I probed IC22 (PIA) and pins 29,30 and 31 are always pulsing - is this correct? As I am new to this level of troubleshooting, I really do not know what to expect.
Thanks in advance
Jeff

