JODY
Active member
The start button has not lit up on my T2 since I bought it. It is the last thing not working (cross my fingers).
I've been checking on some things and looking at the schematics but so far to no avail. I've spent more time on this than any other issue I've had with it including a board repair and it is driving me nuts.
The bulb is fine. Replaced it anyway. In connecting a meter to one side and to ground (ground wire running under the playfield) it shows just over 2 volts and fluctuates. In doing the same thing to the other side it shows the same thing. Check between the two wires with a meter and it shows nothing.
Checking pin 4 on J6 of the coin door interface board with a meter to ground (ground wire under playfield) yields the same 2 fluctuating volts. All the diodes on the coin door board checked OK (checking both ways so it allows flow in one direction).
The lamp matrix shows the Start Button as Row 4 (Q87 transistor) Column 8 (Q91 transistor). The same chart shows Q87 as J133-5 and Q91 as J138-9. A different Lamp Circuit chart shows those transistors going to J133-5 and J138-9 on the playfield and to J135-5 and J136-3 to the cabinet.
I'm confused then as one side of the start bulb is connected to J6-4 on the coin door interface. It is labeled in the schematics as Lamp. It shows it running to J1-2 of the coin door interface and then back to J133-9 on the power driver board. J133-9 is shown in the lamp circuit diagram as Q83 which is a different lamp matrix row.
Basically I'm not sure how the circuit that lights the start button is supposed to be. I'm still learning to read / understand the schematics. I may be misinterpreting something or maybe the schematics are wrong.
I've been checking on some things and looking at the schematics but so far to no avail. I've spent more time on this than any other issue I've had with it including a board repair and it is driving me nuts.
The bulb is fine. Replaced it anyway. In connecting a meter to one side and to ground (ground wire running under the playfield) it shows just over 2 volts and fluctuates. In doing the same thing to the other side it shows the same thing. Check between the two wires with a meter and it shows nothing.
Checking pin 4 on J6 of the coin door interface board with a meter to ground (ground wire under playfield) yields the same 2 fluctuating volts. All the diodes on the coin door board checked OK (checking both ways so it allows flow in one direction).
The lamp matrix shows the Start Button as Row 4 (Q87 transistor) Column 8 (Q91 transistor). The same chart shows Q87 as J133-5 and Q91 as J138-9. A different Lamp Circuit chart shows those transistors going to J133-5 and J138-9 on the playfield and to J135-5 and J136-3 to the cabinet.
I'm confused then as one side of the start bulb is connected to J6-4 on the coin door interface. It is labeled in the schematics as Lamp. It shows it running to J1-2 of the coin door interface and then back to J133-9 on the power driver board. J133-9 is shown in the lamp circuit diagram as Q83 which is a different lamp matrix row.
Basically I'm not sure how the circuit that lights the start button is supposed to be. I'm still learning to read / understand the schematics. I may be misinterpreting something or maybe the schematics are wrong.