I'm having an issue with mist (long range opto) that I could use pinsider help with..
Symptom: Mist motor keeps running back and forth.. ball doesn't attempt to load.
Problem: "Ball on magnet" switch, in switch test will not close when interrupting the long opto beam on the playfield.
Row/Col for the "ball on magnet" switch can be successfully tested at the mpu, eliminating the MPU as the issue
Replaced the opto board w/ the homepin opto board and the LED indicator light is lit, and goes out when breaking the beam w/ my hand. The "ball on magnet" switch never closes in switch test.
Continuity for the row/col test successfully from J3 back to the appropriate pin on the MPU.
All other switches/opto's in the game work correctly
Repinned J3 connector (grasping at straws)
Replaced both transmit and receive optos (grasping at straws)
update: using the original board and a TV remote towards the receiver, the "ball on magnet" switch will close, but manually interrupting the beam will not. I can see the transmitter lit up w/ an IR camera.
using the homepin board, and a TV remote towards the receiver, nothing happens.. I'm thinking the homepin board is defective.
a diode between j3 pin 1&3 (row/col) closes the "ball on magnet" switch correctly, so this should rule out the playfield wiring, and MPU as an issue.
Any thoughts would be appreciated!