My Silverball Mania was working OK--
On thanksgiving I opened it up to change a few bulbs
I had to leave the house in the middle to get something,
When I came back all the kids were pressing all the things
on the playfield (bumpers, roll overs,).
I noticed problems when I got them off...
1) missing last flash on MPU [flashes 6X after initial on - forgot if that is correct (does initial ON count?) ]. Plays PowerUp Tune
2) momentary coils not working (ie start game, bumpers, slingshots)
3) Self test shows switch 34 stuck [50 PT. REBOUND (4) AND TOP BUMPERS (4)]
[All transformer/rectifier fuses & solenoid fuse OK]
For #1:
All TPs on MPU have correct voltage
disconnect connector MPU J1 - no change
replace J1 and disconnect J2 and J3 - no change
Correct voltages on U14 (for zero crossing)
Replaced U10/U11 with W65C21S6TPG-14 from Mouser. [Is this the correct part, or shoudl
I have used current limiting resistor version, or another part altogether?]
For #2
Replaced both playfield fuses (even though only 1 was blown), verified by voltage
and continuity fuses are Ok, and seated)
Q11, Q12, Q15 transistor grounding solenoids OK
Self Test 3,6,11 [Kicker and flipper relays] OK.
For #3
Did quick visual inspection only, working on #1 and #2
Anyone have any suggestions for any of the above?