On my Mousin Around, the target bank does not go up nor down. The motor does not work.
I have checked the Vac going to the motor. It is correct up to the relay board. The Vac should go thru from the relay board to the motor by the relay activation. This should be activated by the sol 11 transitor Q16 (and Q12) grounding.
When I switch on the machine and start a game, I measure 0Vdc on the brown-orange wire coming to the relay board, wheras the power wire measures 27vdc. I would have expected 27vdc on the brn-org, and when the CPU activates the bank, this wire should be grounded by the transistors and then trigger the relay. Am I right ?
I have checked both Q16 and Q12, they are good. The connector 1P12-4 is 0 vdc. R42 is good and SR5 seems to be consistent with Sr7 although I do not measure on either the expected 2.7kohm. Must be due to the other components on the same track.
Can someone confirm to me that 27vdc is expected at game start on the brn-orn wire ? What can I look at next please ? Can U18 be the culprit ? I presume the relay is out as well if the voltage was continuously applied.