f14 tomcat issues.

[beaky]

try doing a coil test in the diagnostics and make sure the test fires the coil or flasher it says its firing on the display.
if i am right about the A/C relay then it when you are in the test when going the lower end of the test it will fire a coil instead of a flasher when the display says flasher

[vanhos]

Yep did a test and all the flasher points fire a solonoid instead of the flashers. Ill check out the ac relay after tea.

I would think this would also be the reason it kicks multi balls into the shooter lane.

[vanhos]

Did amother test run tonight through the solonoids. When it got to the solonoid ac select relay nothing happend. See pic of relay. I check the ohm level of the relay it was 626 ohms. Checked a other one it was the same so i assume the coil in th ac relay is fine. Thats with out unsoldering all the relays.

Any ideas on were to go now.

[Steevsee]

.......sounds like the A/C relay is not working so the machine tries to send power to a flasher but because the A/C relay is not working the power goes to the ball kick out instead

Nice diagnosis Beaky.

Be worth checking that diode and maybe re-soldering the wires.

[beaky]

.......sounds like the A/C relay is not working so the machine tries to send power to a flasher but because the A/C relay is not working the power goes to the ball kick out instead

Nice diagnosis Beaky.

Be worth checking that diode and maybe re-soldering the wires.

thanks steevsee

did you sort out the fuse problem?
if you havent then the fuse that keeps blowing may supply the voltage for the relay?

[vanhos]

Yeah i replaced the fuse and then did the test. Fuse was ok after the test run..

[vanhos]

Did another test on the ac relay. I stopped the self test on ac relay and decided to measure the voltage on the board..

Across the tabs coil and NC i got 32v dc

Across NC and DRV flucuate between 0 and 10v.

All the others i got nothing.

The tab that says 28v does not have anything soldered on it.

During the test the fuse is ok. Fuse only blows at the end of the game. Trys to kick out all the balls into the shooter lane and some flash globes light up for a few seconds.

I have resoldered the board aswell..

Still no idea were to go..

[vanhos]

I also checked the transistors Q7 And Q8. Results below.

Q7..

B+  /  E     869
B+  /  C.    798
B-   /  E.    881
B-   /  C.    OL
E.    /   C.   629
+C.  /  -E.   OL


Q8.

864
820
877
1093
558
656.

Just woundering after reading a few sites that either of these two transitors have something to do with the AC relay.

Would Q8 be buggered with these readings...

[Steevsee]

Couple of quick and easy tests for the large transistors.

1. With the power OFF,  use your meter to check for continuity between ground, and the metal tab of easch transistor.

There should be none.  Any transistor which has continuity with ground, is shorted on.

2. With the power ON, clip a jumper lead to the metal tab of Q7, (which drives the A/C relay).  Next touch the other end to the ground braid, whilst listening for the A/C relay to click.  Just touch quickly and release.

From your earlier measurements, it seems like Q7 might be OK, but Q8 (which controls the line of death kick back), might be bad, as you suspected.

Also have you checked all of the coils in the game for resistance?

[Steevsee]

I have resoldered the board aswell..

Still no idea were to go..

Did you also reflow the pins of the relay itself?

[vanhos]

cheers,

will check tonight about the grounding.

i read about the jumper to the ground braid but was a bit scared to do so. i will try all these tonight.

i did reflow everything on this board.

do the connections on the board look correct should there be anything connected to the +28v tab .

[Steevsee]

Not 100% sure, but I think you may be right about the 28v tab.

Found this pic online.

[Steevsee]

Could be a brown/blue wire coming from pin 7 of J 12 on the cpu board.

[Steevsee]

Could be a brown/blue wire coming from pin 7 of J 12 on the cpu board.

Or is that brown/blue wire on the DRV tab?

[vanhos]

Yeah looks a bit different any body else out there can take a pic of there ac relay on a f14 tomcat