opt2not
Well-known member
After working a while on my asteroids restoration, I've finally got to a point where I've hit a dead end.
My Asteroids plays blind. I've got a verified working Asteroids PCB.
My G05-805 has no image displayed when the game is running. Spot-killer is LED lit, lamp heater is glowing strong, and I hear chatter from the monitor, and buzz/noise from the HV section. Fuses checked good. No burning, no smell. Just nothing on screen.
I flipped the switch for test mode, and checked my PCB voltages, I get a solid 5.1v from the 5v tap. My X, Y and Z voltages seem pretty low fluctuating between -1.2 and 1. But the funny thing is, this board is verified working! Hooked it up to my friend's machine and it played fine.
So this leads me to believe my Power supply may not be giving me the right amount juice. I checked my voltages on the A/R board, nothing there that looks out of wack. Getting 5.3v on the 5v line, and 14.3 on the 10v line (not under load).
The board seems to be running fine with these voltages, as I can hear the game play properly without any hiccups.
Doing some more digging, I noticed the B&W monitor faq recommends checking the P100 connector for readings.
30 VAC should be on pins 7 and 10, but I'm getting nothing! Zero. Same thing for the 6.3 VAC line!
Tracing the wires, I believe these come directly from the power block, and not through the A/R board. Am I correct in this?
If so, then my block could be the culprit.
I pulled my block out, checked the small Rectifier board that has two saucer-style diodes. Removed the diodes from the board and check it with my Diode test on my multimeter. Got between 400-500 one-way on both, no readings the other way. So I'm assuming the diodes are still good. (can someone verify this for me?)
Fuses checked good, I've got a new fuse-block installed on it, checked all my connections as well, all fine.
The only other hardware on there is the EMI filter, and the fat Isolation Transformer.
Could it be the Isolation Transformer? Is there any other test I can try to find why I'm not getting and VAC to the monitor lines?
My Asteroids plays blind. I've got a verified working Asteroids PCB.
My G05-805 has no image displayed when the game is running. Spot-killer is LED lit, lamp heater is glowing strong, and I hear chatter from the monitor, and buzz/noise from the HV section. Fuses checked good. No burning, no smell. Just nothing on screen.
I flipped the switch for test mode, and checked my PCB voltages, I get a solid 5.1v from the 5v tap. My X, Y and Z voltages seem pretty low fluctuating between -1.2 and 1. But the funny thing is, this board is verified working! Hooked it up to my friend's machine and it played fine.
So this leads me to believe my Power supply may not be giving me the right amount juice. I checked my voltages on the A/R board, nothing there that looks out of wack. Getting 5.3v on the 5v line, and 14.3 on the 10v line (not under load).
The board seems to be running fine with these voltages, as I can hear the game play properly without any hiccups.
Doing some more digging, I noticed the B&W monitor faq recommends checking the P100 connector for readings.
30 VAC should be on pins 7 and 10, but I'm getting nothing! Zero. Same thing for the 6.3 VAC line!
Tracing the wires, I believe these come directly from the power block, and not through the A/R board. Am I correct in this?
If so, then my block could be the culprit.
I pulled my block out, checked the small Rectifier board that has two saucer-style diodes. Removed the diodes from the board and check it with my Diode test on my multimeter. Got between 400-500 one-way on both, no readings the other way. So I'm assuming the diodes are still good. (can someone verify this for me?)
Fuses checked good, I've got a new fuse-block installed on it, checked all my connections as well, all fine.
The only other hardware on there is the EMI filter, and the fat Isolation Transformer.
Could it be the Isolation Transformer? Is there any other test I can try to find why I'm not getting and VAC to the monitor lines?


