i'm completly missing this. i double checked the scematics, but i cannot find the 6.3 volt lead for the heater. can you dummy it down for me? thanks again.
i am getting 6.82 AC volts to the coin door light. learn something new everyday, i thought that was DC voltage. thanks.
Well, it looks like the 6 volts is leaving the transformer assembly.
Next, I would follow it and make sure it's getting to my monitor.
OK, pull out schematic sheet 1...side A.
Top left-hand diagram labeled "video power supply wiring diagram".
This is the schematic for the transformer assembly. Note the right-hand side of that diagram, and the number J5...and then the numbers 1 thru 15 under it. J5 is the big 15-pin connector that exits the transformer assembly, and 1 thru 15 are the designations (or "pins") in that connector. Notice pin number 8 and 9 are both labeled 6.3VAC. This is where the 6 volts exits the transformer. You'll also notice the letter "Y" beside the numbers 8 and 9. The "Y" means yellow....as in yellow colored wire. You can even follow the "line" at pin 8 back to the transformer. You can see, right before it gets back to the transformer, it goes through fuse F6. If this was blown, you'd loose the 6VAC needed for the monitor heater and the coin door lights.
OK, now jump down to the center bottom of this same schematic page. Now we'll look at the diagram labeled "asteroids wiring diagram". This is basically the "layout" of all the wires and connectors in the Asteroids machine. Note the top middle of this diagram...the dotted outlined box labeled "vidoeo power supply wiring diagram". This is the transformer assembly we were just looking at. Note the connector labeled P5, and the numbers 1 thru 15. P5 is (basically) the same as J5. J5 was the connector "housing" on the transformer assembly...P5 is the connector "housing", that is part of the wiring harness, that plugs into J5. Numbers 8 and 9 are labeled as 6.3VAC again....but now the are listed as BU (= blue colored wire) and BU/W (= blue wire with a white stripe). Now, you just have to follow the "lines" around the diagram to see where the 6 volts go to. You see they go to a 6 pin connector labeled J100...and J100 is noted as "monitor power". This connector plugs into your monitor. You can see the 6 volts enters the monitor at pins 6 and 3. You can also follow the other "lines" on connector J100 back to the transformer assembly, and you'll see what other voltages/signals they are sending into the monitor.
J100 plugs into your monitor....so, to continue following the circuit, we have to switch to the monitor schematics. So, at P100 (remember, we've on the other side of the connector...so, it's now a P (as opposed to a J designator). Pin number 3 is labeled "filament ground"....another name for the heater. Pin number 6 is labeled "filament 6.3VAC". We see "filament ground" runs around this board and exits at connector P101 at pin 7. "Filament 6.3VAC" goes into resistor R104 and then exits at connector P101 at pin 8. From here, they run up to the neck socket and enter the tube.
I'd check the headers on the monitor for cold solder joints. You could check connector P101 and see if the 6 volts is leaving it. It's possible R104 could be bad.
Edward
