(Topic ID: 249665)

Zaccaria Farfalla: some coils 'pulse' permanently

By Elwood_BE

3 years ago

Topic Stats


Linked Games

#1 3 years ago

Hello everybody,

I received a Farfalla, it's my first solid state pinball (I restored a lot of WPC previously).

No battery leakage, first good point and I can start a game, second good point.
But in attract mode or in game, some of the coils "pulses" permanently. They are not always on but switch from off to on to off very quickly.

Have you an idea of what can I look to try to find a solution ?

#2 3 years ago

Have you measured the 5 volts on the CPU and driver boards?

#3 3 years ago

You are right, I read on TP4 at power supply 4,2V. I didn't check as the CPU boots.
Thus, it's possible that those symptoms are linked to this low 5V ?

#4 3 years ago
Quoted from Elwood_BE:

You are right, I read on TP4 at power supply 4,2V. I didn't check as the CPU boots.
Thus, it's possible that those symptoms are linked to this low 5V ?

Yes, very well can be linked to low 5v. If you measured 4.2v on the power supply, likely you will have the CPU and driver board at 3.9v. That is assuming the power connectors are not losing more than that at those 2 boards.

Anything less than 4.75v can be causes of resets, not booting, sounds cutting out/no sound, other random things.

#5 3 years ago

Thank you very much for your help.
The other TP are also a little bit low (except TP3).


I took look at the schematic. If I understand well, The creation of 5V is quite simple. I'm must verify that I have 6.5VAC between pin 9&11 of CN1 to see if it's ok at the transformer side, verify if I have 47 Ohm at R20 and if the two answers are yes, the only other possibility of failure is P3. The 5V is not regulated ?

#6 3 years ago

The front of your transformer is set for the correct AC line voltage to your 230Vac wall voltage?

#7 3 years ago

I just verified and yes, it's ok.

I also verified voltages at CN1

Between pin 1&2: theoretical:165 VAC Measured: 166VAC
3&4: 10 VAC - 9.7 VAC
5&6: 10.5 VAC - 10.5 VAC
7&8: 43 VAC - 43.5 VAC
9&11: 6.5 VAC - 7 VAC

Thus, everything seems good. To be sure I replaced the two parts of the CN1 connector but no change.

1 year later
#8 2 years ago

Mine has also just started doing this in conjunction with low voltage at the coils.
Did you end up sorting out the issue?

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