Re: Jurassic Park Pinball T-REX MOUTH
- From: frogbridge@xxxxxxxxxxx
- Date: Sat, 18 Aug 2007 10:58:09 -0700
On Aug 17, 1:20 pm, RonKZ650 <RonKZ...@xxxxxxx> wrote:
The red wire on CN3 is your power for the coil. You should have power
there all the time the game is on (40vdc or so, exact voltage is not
regulated). From there, the red goes to the banded end of the diode on
the dino. Yes, color changes in the harness going up to the dino, just
make sure red eventually is connected to banded end of diode. 40vdc
goes through the coil, back through the brown wire to pin 6 of CN12
then to the collector of Q26. So you should have about 40vdc all the
time the coil is sitting idle when the game is on at all these places,
so check that. If you do, then power is OK and you can try
momentarilly grounding the collector tab of Q26 to see if the coil
fires. If it does, you'll need to continue working around Q26 looking
for broken circuit lays on the board ect. If it doesn't fire, try
grounding the non-banded end of the diode on dino and see if that
fires the solenoid. If it still doesn't fire, monitor DC volts on the
banded end of the diode as you ground the non-banded end and make sure
the 40v is not dropping off. If so follow it into CN3 ect and find the
drop. Good luck. In diagnostics you should have 40v all the time on
the banded end of the diode, and see a quick drop that goes to zero as
the transistor trys to fire the solenoid on the non-banded end,
however a meter is too slow to pick up the quick voltage drop, so
you'll see it drop, but not all the way to zero.
On Aug 17, 9:15?am, frogbri...@xxxxxxxxxxx wrote:
On Aug 17, 10:57 am, RonKZ650 <RonKZ...@xxxxxxx> wrote:
If you reversed the wires, the diode on the coil for the jaw will be
shorted, so you definately need to replace it before proceding into
the transistors. If you replace the transistors without replacing the
diode, the new transistor will be destoyed the first time power is
turned on. So if you didn't replace the diode, do so, then replace Q26
and recheck F5.
On Aug 16, 11:43?pm, frogbri...@xxxxxxxxxxx wrote:
I just bought a Jurassic Park pinball machine. When I got it, the T-
REX would not eat the ball but would move its mouth when up. I
discovered the harness was worn and the inside wires cut. I proceeded
to install new wires (black and a white) but I did not note before
hand which lead was the power. I suppose I reversed them, as when I
turned on the machine, the F5 fuse on the main driver board blew and
transistor Q26 started to melt. I have since replaced the TIP122 Q26
transistor (with a TIP102) as well as the small pre-driver
transistor. Now, while everything else works on the machine, the
mouth does not. Is there a fuse that only controls the mouth? Can
someone please help me...I need to get some sleep and this issue is
keeping me up.- Hide quoted text -
- Show quoted text -
Thanks for the advice. I followed these steps but it is still not
working. I put a probe on the lead from CN3 and can see 47 volts DC
coming from there (I had heard there should be 36V there but I'm
seeing 47). I believe this feeds pin 6 of CN12. I then checked there
and can see the same voltage. I suppose this means that 47 Volts is
getting to the Collector lead of the TIP102 transistor. I then put
probes on the leads of the solenoid and ran a diagnostic on the coil
and see very little voltage (1v on one lead and 0v on the other) being
pushed to the solenoid. I'm not sure what I should see but I've been
assuming when the transistor is ON the solenoid would see the 47
volts. Do you know what I should see in the way of Voltage on each
lead of the Solenoid? Also, the white and black leads that go to the
solenoid actually connect to a solid green and solid red wire under
the playfield. I'm assuming the red is the power and should connect
to the solenoid lead on the diodes banded side. Can you confirm? Can
I run a direct wire from pin 6 of CN12 and touch the banded side lead
of the Solenoid just to see of the Solenoid works (bad idea...)?- Hide quoted text -
- Show quoted text -- Hide quoted text -
- Show quoted text -
Problem solved. Thanks for all the help. It was huge. After fixing
the wiring and the transistors and the fuses in the backbox I
discovered there was one more fuse way at the bottom of the
playfield. This fuse must have blown during the process. Replaced it
and now all is well. THANK YOU!
.
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