(Topic ID: 203202)

Elvira Help

By robertg130

6 years ago


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Topic Stats

  • 86 posts
  • 6 Pinsiders participating
  • Latest reply 6 years ago by GRUMPY
  • Topic is favorited by 2 Pinsiders

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#7 6 years ago

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.

#11 6 years ago

Do you have a logic probe?

#13 6 years ago
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.

#15 6 years ago
Quoted from Taxman:

Also please check for old battery corrosion.

^^^^ Not a bad idea to take a pic of the CPU board.

#18 6 years ago

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.

#20 6 years ago

Use a ohm meter and check Q71 metal tab to ground. Should be .600 meg or higher.

#22 6 years ago

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.

#25 6 years ago

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.

#28 6 years ago
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.

#31 6 years ago

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.

#32 6 years ago
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.

#33 6 years ago

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.

#34 6 years ago
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.

#38 6 years ago

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.

#40 6 years ago

With a game started measure resistance from the collector pin 2 to ground on all 22 TIPs on the Cpu.

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#42 6 years ago
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.

#44 6 years ago

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.

#46 6 years ago
Quoted from robertg130:

Ok,you’re right

Don't be to sure on that, just ask my wife.

#50 6 years ago
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:

Q75=63 ohms
Q71=activate right sling

Replace the predriver for these and retest.

#56 6 years ago
Quoted from robertg130:

Not righ slingshot,right bumper I mean

Check coil resistance, should be 4.0 ohms or more.

#58 6 years ago
Quoted from robertg130:

Coil measure 5 ohms

Good, check D19 on the aux P/S.

#61 6 years ago

Remove 1J11, 1J12, 1J19 and 5J11, 5J12. Measure resistance from the ground braid to the control wire on right bumper.

#63 6 years ago
Quoted from robertg130:

Not sure what is the control wire some measures

There should have been a blue/orange wire on the coil lug.

#65 6 years ago

Remove 1J11, 1J12, 1J19 and reconnect 5J11 and 5J12. Turn on power. Start a game, does any coils lock on now?

#67 6 years ago

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.

#69 6 years ago

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.

#72 6 years ago

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.

#74 6 years ago
Quoted from robertg130:

1j12 pin 5=650 ohms

Yes this is a problem, do not connect J12 at this time.

#78 6 years ago

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.

#81 6 years ago
Quoted from robertg130:

I’m gonna change the pia chip and see what happens

I would test it first.

#84 6 years ago

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.

1 month later
#86 6 years ago

Have you checked the the GI relay on the insert board for cracked solder joints? If that's fine check for cracked solder joints on the header pins of the interconnect board.

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