strange thing happens when i power up system 11 wms

[beaky]

hi guys
i have noticed some times when i first power up my bk 2000 the credit knocker will pop once (its not trying to report a switch fault which gives you multiple knocks).
and my sof will activate the kickback once. 

these things only happen intermitently and only at the exact time i turn the switch on.

has any one with system 11 had the same thing happen to them?
or does any one know why this happens?

one thing i haven't done yet is checked wether these 2 solenoids are controlled by the same transistor.

[FirePower]

Is there a reset / hold circuit on the cpu?  Earlier WMS (and I think other) cpus have this to wait until power supply voltages are stable before letting the microprocessor code run.  I'd be looking carefully over this.

[ddstoys]

My gorgar pulses the outhole kicker when its turned on.  (Not enough to eject the ball though)