If the zener diode is turning on the coil it will be shorted. Easy to check ohms across the zener, a low reading is bad.
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If the zener diode is turning on the coil it will be shorted. Easy to check ohms across the zener, a low reading is bad.
Quoted from robertg130:Please I’m good repairing wpc system,but this system is my first one.
Then this should be easy for you.
Quoted from robertg130:Left slingshot selenoid lock when turning on machine
Right popbumper also locks on the same
Disconnect 5J11 and 5J12 on the aux power supply. This will cut the power to all flashers and solenoids. Now you can turn on the power to test with no worries of melting coils. Then you can hook up your logic probe to the CPU test points and start testing.
Quoted from Taxman:Also please check for old battery corrosion.
^^^^ Not a bad idea to take a pic of the CPU board.
Lets start with the left kicker(SS#2). Page 3-7 in the manual shows Pins 5 and 6 of U-45 are inputs and pin 4 is the output. With the power on and in attract mode both pins 5 and 6 should be high and pin 4 should be low. If good the check the base of Q-70, this should be a low also. If good then test the base of Q-71, this should be a low also. Let me know what you find.
Sounds like the cpu is fine. Certain coils are high voltage coils and they a higher power tip to control them. They are on the aux power supply. Q6 controls this coil. Test it for a short.
You weren't ready to connect power at 5J11and 5J12 yet. Now that attract mode is good it's time to start a game and retest U-45 and U-50 inputs. The inputs from the switches should still be all highs and the other enable inputs should have gone to lows. Check these and let me know what you find.
Quoted from robertg130:Looks like both 7204 chips are bad.Some said this is happens a lot
When a pin is not maintained for a long time, the power supply starts putting more AC voltage on the DC and this stresses the logic parts.
Your testing shows that U-45 and U-50 needs to be replaced. Then more testing will need to be done to correct any other problems.
Quoted from GRUMPY:Your testing shows that U-45 and U-50 does not need to be replaced yet. Then more testing will need to be done to correct any other problems.
Edit for bad talk and text.
Quoted from robertg130:Changed Q6
Any time you change a TIP you need to change the corresponding diode. So you need to change D-22
Quoted from robertg130:u-45 pin5=h,pin6=l,pin 4=l
What does the base of the predriver and driver show. If both show low then check resistance of metal tab to ground. Sometimes the TIP test good but are bad when powered up.
Quoted from robertg130:U-50
Pin5=h,pin6=l,pin4 =l
This for the flip up reset, and looks fine.
You need to check U-45 pins 2 and 3 inputs and pin 1 output for the right pop bumper problem.
Lets try testing U-45 again, in attract mode pins 2,3,5,6,8,9,11 and 12 are high. Pins 1,4,10 and 13 are low.
In game mode,pins 2,5,9 and 12 are high and pins 1,3,4,6,8,10,11 and 13 are low. Then place your probe on pin 1 (its low) then push the skirt of the right pop and the probe should read high. Then do this for pin 4, push the left sling rubber and pin 4 should go high. Next would be pin 10, push the right sling and pin 10 should go high. Last check pin 13, and push the left pop skirt and pin 13 should go high.
Quoted from robertg130:On you mean dmm in diode test?
DMM in resistance test.
Quoted from robertg130:Black to center leg(or tap)and red to ground?
Black ground. Red center lead.
Quoted from robertg130:There is 38 tip 122 on cpu board
There is only 22 TIP 122 that control solenoids, there are 8 TIP 42 and 8 TIP 122 in the lamp matrix section.
Q-7=250. Q-69=9.5 Q-71=246 Q-75=16.5 these needs to be replaced with TIP102. Then retest again and all should be infinite.
Quoted from robertg130:Ok,you’re right
Don't be to sure on that, just ask my wife.
Quoted from robertg130:Changed transistors,but used t122,Q6 to hot and damage again
You must leave 5J11 and 5J12 off until all troubleshooting is done. Other wise you will keep damaging stuff.
Quoted from GRUMPY:Then retest again and all should be infinite.
Retest with DMM not by hooking up coil power.
Quoted from robertg130:Q69=55 ohms
Quoted from robertg130:Q75=63 ohms
Q71=activate right sling
Replace the predriver for these and retest.
Quoted from robertg130:Not righ slingshot,right bumper I mean
Check coil resistance, should be 4.0 ohms or more.
Remove 1J11, 1J12, 1J19 and 5J11, 5J12. Measure resistance from the ground braid to the control wire on right bumper.
Quoted from robertg130:Not sure what is the control wire some measures
There should have been a blue/orange wire on the coil lug.
Remove 1J11, 1J12, 1J19 and reconnect 5J11 and 5J12. Turn on power. Start a game, does any coils lock on now?
With everything hooked up like this
Quoted from robertg130:No coil is lock with 1j11,1j12,1j19 out and 5j11 and 5j12 in
Start a game and test resistance to ground on each pin on the CPU board of the disconnected connectors J11,J12 and J19.
This all looks good, so with game powered on and a game started slowly plug in each connector. If a coil fires while plugging in connector, remove it right away.
If all is good then unplug 1J8 and 1J10 and put in switch test, does any switch show up on the display.
My fault, you need to be in switch test first. Then disconnect J8 and J10, see if any switches show up as stuck closed. If something shows up it's a board problem. If nothing shows then remove the balls and reconnect J8 and J 10. Does anything show up now. If something shows up look to see if the switch is stuck closed.
Quoted from robertg130:1j12 pin 5=650 ohms
Yes this is a problem, do not connect J12 at this time.
I'm in Vegas for the next 5 days, so I wont be around to much. You better keep 1J19 disconnected too. It seem that sometimes the pins are good and then later they are low ohms and locking on coils. This can be a bad Pia chip. Hard to catch this when it happens. I had this on a Pinbot board where a pia chip would randomly lock on one coil, even in attract mode.
Quoted from robertg130:I’m gonna change the pia chip and see what happens
I would test it first.
I'm back.
Quoted from robertg130:1j12 pin 5=650 ohms
This is for the A/C relay, some games switch this on and off in attract mode so some flashers can work. I don't have an Elvira so I can't confine this.
Quoted from robertg130:When I connect IJ19 right bumper stuck
Clip logic probe on U-45 pin 2 and leave game in attract mode and monitor the output, this should stay constant high.
I'm taking for granted that you checked the power supply output voltages. 5 and 12 volt.
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