Archived from groups: rec.games.pinball (More info?)
Some of you may remember I was having a problem with the Extra Ball target
(#56) that was also registering #66 (opto/left main ramp), #76 (RT trough)
and sometimes #62 (opto/whirlpool exit) during the switch edge test. You
may also remember that I moved a wire on the switch for #46 and the problem
vanished.
Well, today I replaced my L-3 prom with the new L-5 (game was unplugged)
.....the game booted fine and I played a few games and noticed the Extra Ball
wasn't working again. So I started tracing wires and found nothing. I
traced the WHT-BLU wire to the backbox and started looking at the CPU board.
One of the smaller IC chips didn't look as if it was seated all the way so I
fully seated it. There was also corrosion on most of the R51 - R78 row of
capacitors so I used some electrical parts cleaner with a soft brush and
cleaned most of it - I didn't want to go too hard.
Now, when I turn the game on I'm getting the following errors:
GR SHORT Row2
WHT-RED R2
GR SHORT ROW 6
WHT-BLU R6
BIG FOOT ERROR R6
WHT-BLU
Checked the CPU board and R2 and R6 look fine. Whoever had the game before
me did a very poor job resoldering the caps on the CPU board. R31 - R34 look
replaced and R33 looks like it's reversed. Is it supposed to be? Also,
there's a jumper wire on U18 #2 to R29 .. what's that for?
Are the CPU boards interchangable at all? I'm really not comfortable
resoldering those caps and I feel that whoever did the previous work might
have shorted something out?
Thanks for any help.
Some of you may remember I was having a problem with the Extra Ball target
(#56) that was also registering #66 (opto/left main ramp), #76 (RT trough)
and sometimes #62 (opto/whirlpool exit) during the switch edge test. You
may also remember that I moved a wire on the switch for #46 and the problem
vanished.
Well, today I replaced my L-3 prom with the new L-5 (game was unplugged)
.....the game booted fine and I played a few games and noticed the Extra Ball
wasn't working again. So I started tracing wires and found nothing. I
traced the WHT-BLU wire to the backbox and started looking at the CPU board.
One of the smaller IC chips didn't look as if it was seated all the way so I
fully seated it. There was also corrosion on most of the R51 - R78 row of
capacitors so I used some electrical parts cleaner with a soft brush and
cleaned most of it - I didn't want to go too hard.
Now, when I turn the game on I'm getting the following errors:
GR SHORT Row2
WHT-RED R2
GR SHORT ROW 6
WHT-BLU R6
BIG FOOT ERROR R6
WHT-BLU
Checked the CPU board and R2 and R6 look fine. Whoever had the game before
me did a very poor job resoldering the caps on the CPU board. R31 - R34 look
replaced and R33 looks like it's reversed. Is it supposed to be? Also,
there's a jumper wire on U18 #2 to R29 .. what's that for?
Are the CPU boards interchangable at all? I'm really not comfortable
resoldering those caps and I feel that whoever did the previous work might
have shorted something out?
Thanks for any help.