pinballdirec
Member
I have a Williams Defender that is reporting a Ram / Rom error on the CRT. The 4 L.e.d's blink once and then go blank. Anyone have any idea what error this is? Kevin
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Wow. It sounds like all my "broken record" nagging about RAM voltages and crimping cables is starting to pay off.
The voltages you are looking on the RAMS are:
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ken
Thanks Everyone... I'm getting 5.15 on all the boards connections except the CPU, I'm getting about 4.85 v - 4.93 v. If I unplug the CPU I get 5.15 at the connection.
On the 4116 chips I'm getting about 4.80v.
I crimped the ribbon cable on the unattached side, I was sure how to crimp the attached side.
I'm still on getting the 4 LED's to flash once. I do get sound.
I have a switching power supply installed also.
any ideas where to look next? Kevin
I cleaned the power connection pins on the CPU and now I have 5.15v on the 4116 chips, but still have only getting the 4 leds to flash once.
All 4 LEDs flash once then go out? Yes
Do they all stay out? Yes
You said you hear sound, is it the "Defender growl" Yes Defender growl