Location changed: Workshop → Storage
Status changed: Fixing → Broken
Replaced fried 5w resistor on the magnet resistor board. (Magnet and lighting for the ‘snake’ element at the upper left side of the play field)
Moved left peg because drop target was rubbing against band preventing it from dropping. Drop target smoothly goes up and down now
Cleaned rear drop targets
Applied stickers and reinstalled front drop targets and saudered an errant loose wire on the back of the second target assembly.
The drop targets are catching ever so slightly on the bumper rubber behind them, i think this can probably be fixed by cheating/ bending the posts that hold the bumper back just a hair……
Started sorting out lights. Tested bulbs in ABC and pit 5000-50,000. Cleaned the bulbs and lenses, which were filthy.
Some bulbs did not come on. Traced problem to plug for connector 2J5, lamp column drive. Needs to be replaced.
General cleaning of the play surface and plastic overlays. Changed out most of the rubber rings. The upper left corner of the board still needs rings swapped out (remainder of ring kit on machine).
Repinned and replaced connector 10J4, sound board remote volume. Didn’t help.
Debugging the sound board:
- fuses are good
- input power is good
- on-board regulator and voltage converter is good; test points all have approximately correct voltages
- checking the speaker output with the oscilloscope shows nothing
- same for the output of IC1
Reading further, the sound board signal gets sent to the speech board for mixing with speech and then comes back for output.
Continued!