(Topic ID: 239331)

Solenoid board issues.

By flappybob123

5 years ago


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#10 4 years ago
Quoted from flappybob123:

I replaced all the connectors anyhow, but the wrong solenoids sitll continue to fire. Any ideas where to go from here?

You'll need to provide more details about exactly which solenoids are/aren't working when they should.

Go into solenoid test mode.
Note down which solenoids rightly, wrongly or if none activate as the solenoid numbers cycle through the test mode and report them. Then we can build a map of what is logically going wrong in the signal chain.

#15 4 years ago
Quoted from flappybob123:

I placed an (x) next to the solenoids that fired incorrectly. Let me know what I should do from here!

Much better fault report.

There are four momentary solenoid select signals from the MPU board to the SDB. These are signals PB0, PB1, PB2 and PB3 which come from pins 4, 3, 2, 1 respectively on J4 of the MPU board and go to pins 6, 5, 4, 3 respectively at J4 of the SDB.
From the Solenoid Driver Board (SDB) schematic, below are the four PB0, PB1, PB2 and PB3 signal states and which solenoids the combination of states select. The four digits in the left column are binary numbers - "0" means zero volts, "1" means 5 volts.

One of these four signals is not reaching the SDB circuit. The solenoids listed on the left are what should activate, the solenoids on the right are what you are getting.
It is clear the PB3 signal is not getting from the MPU board to the SDB and the SDB is always seeing PB3 as a "1". This is a red-white wire from MPU J4 Pin 1 to the SDB J4 Pin 3. So you need to find out where the break in connection is - most likely one end of that wire has been badly crimped or the pin on SDB J4 pin 3 needs to be resoldered.

SolenoidList_PowerPlay.jpgSolenoidList_PowerPlay.jpg

#20 4 years ago

You'll need to follow that malfunctioning PB3 signal from source to destination.

It starts at pin 13 of U11 on the MPU board, goes through resistor R100 then reaches pin 1 of the MPU J4 connector. Then it goes out through that red-white wire to pin 3 of J4 at the SDB and onto pin 20 of U2 on the SDB.

The following is better done with a logic probe if you have one.
Get the game in solenoid test mode. Measure the voltage on that signal at pin 13 of U11 on the MPU board. It will normally sit high at around 5 volts and briefly pulse low to zero volts when activating any of those first eight solenoids listed in the chart I posted above where you're getting wrong activations. The pulse will be too fast for your meter to show zero volts but you should see your meter react.

Follow the signal until you find the break in activity.

#22 4 years ago

How much resistance do you measure between the source of pin 13 of U11 on the MPU board and destination pin 20 of U2 on the SDB?
Compare it to one of the other solenoid select signals, say PB1 which goes from pin 11 of U11 on the MPU board and pin 22 of U2 on the SDB.

So set your multi-meter to resistance mode (if your meter isn't auto-ranging, set it to 2000 ohms range). One meter lead goes on the source pin, other meter lead goes to the destination pin.

You should read about 470 ohms according to the schematics for both signals.

1 week later
#25 4 years ago

Just beat me to it barakandl

To answer your other question:

Quoted from flappybob123:

Or do the signals that enter U11 have the problem? Like does the signal enter u11 pulsed or is it supposed to only exit pulsed? And which input or inluts on u11 corresponds to the output PB3?

Data input line D3 (pin 30) has some control on what output signal PB3 on port B does. D3 also corresponds to the other output signal PA3 on port A.
When the game tests the U11 PIA during power on self test, it writes to all registers in the PIA and expects the same data when read back. A problem on input pin D3 would exhibit itself during these tests and the PIA would fail the 5th LED flash. So input pin D3 on U11 isn't your problem.

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