(Topic ID: 239837)

Rescuing a Whirlwind!

By PantherCityPins

4 years ago


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#20 4 years ago

I am wondering if your board is booting in the first place. Normally sys11 boards will give you some sort of error code presenting itself via the diagnostic led.
Hope this helps you narrowing down the issue.

System 11a, 11b, 11c Diagnostic Flashes.
These games do not have a 7 segment display. Instead there is a LED which indicates the memory chip test being preformed. To start the memory chip test, turn the game on or press the bottom CPU diagnostic switch button SW2 on the left side of the CPU board. Quickly count the CPU board LED flashes of the middle (diagnostic) LED, and compare them to the follow chart.

Flash

Display Message

Explanation

1 U25 RAM Failure U25 RAM could not be used. No other tests are performed; the game is locked here until the problem is fixed.
2 Memory Protect Failure This message means: (A) the coin door may be shut; (B) the Memory Protect switch may be stuck in the ON position; (C) the Memory Protect logic is protecting the audit memory; (D) a U25 RAM failure is occurring. Note this test assumes the coin door is OPEN since this test is initiated ONLY by pressing the CPU diagnostic switch (SW2).
3 U51 PIA Failure 6821 PIA at U51 has failed. *
4 U38 PIA Failure 6821 PIA at U38 has failed. *
5 U41 PIA Failure 6821 PIA at U41 has failed. *
6 U42 PIA Failure 6821 PIA at U42 has failed. *
7 U54 PIA Failure 6821 PIA at U54 has failed. *
8 U10 PIA Failure 6821 PIA at U10 has failed. *
9 IRQ Failure IRQ has malfunctioned. It may be missing or too slow or too fast.
10 U27 ROM Failure The ROM (or EPROM) at U27 did not pass its internal checksum. This could be a ROM failure, or its associated components and connections may be causing this problem. U26 ROM test is skipped.
11 U26 ROM Failure The ROM (or EPROM) at U26 did not pass its internal checksum.
* Alternatively, the PIA's associated connections or components are causing the PIA to appear bad.

#21 4 years ago

My best guess however is that PIA's at U41 and U42 are failing. They can get a decent beating with acid damage. Can you post some images of the damage?

I do repairs on board by the way, I repaired a lot of sys11 boards over the years. Once acid damage isn't handled correctly new problems will occur over time. So clean your board with vinegar en rinse with distilled water. (You have done that already).

http://www.flippergast.nl/?p=51

This is a link to my Fire! project, this cpu board was as dead as a doornail. After repairing it the sys11 boards have no secrets anymore.

#23 4 years ago

has been worked on before. Acid damage tends to go on after a bad repair. What do the flashes tell you?

#25 4 years ago

Are your voltages okay? Measure +5 volts and +12 volts

#26 4 years ago

First 5 secs of the video, watch the led's in the middle of the screen.

+5 volt comes on, blanking comes on and diagnostics is flashing fast and continiously. That's normal operation. You say the blanking led is not coming up, please press the diagnostics switch and how many times the diag led is blinking.

#27 4 years ago
Quoted from PantherCityPins:

There’s no specific flashes, the blanking light doesn’t turn on and the diagnostic light flashes continuously

Some theory by the way: if blanking isn't enabled your insert lights, coils and displays aren't enabled. This to protect the machine in case of malfunction.

#31 4 years ago

Well, coils do go bad. In case of bad flipper response I always order new coils. In the case of a whirwind the end of stroke switch is also quiet important and to protect that EOS add a proper capacitor (that yellow one) to prevent it from burning in. Also the gap of that EOS is pretty important for the ooomph on your flippers. To check the coils just exchange them from left to right and see if the problem moves. If so, then replace the coil.

Also in regular cases the wrong coil is being replaced by an "operator". Check the manual if you got the correct one (11629 from my head).

Good luck, whirwind is a decent game.

I see no need to replace the relay by the way.

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