I've got a Junkyard which was working perfectly last week.
Installed a color DMD. Now the flippers don't work
(likely not related to Color DMD installation IMHO).
1) ALL Switches register in diagnostic switch test including
door, both flipper buttons and flipper EOS.
2) ALL coils work in diagnostic mode (except flippers).
3) ALL flipper fuses are good
4) 74V at ALL flipper terminals
5) Both Flippers DO operate if alligator clip grounded from their respective ground tabs to the side rail (both Strong and Hold, both left and right).
SO, CPU "sees" flipper buttons, all circuits are working....
CPU apparently is not grounding the coils to fire them???
What am I missing here???
Ron Kral
CARGPB #23
On 2021/04/14 5:31 p.m., Ron Kral wrote:
I've got a Junkyard which was working perfectly last week.
Installed a color DMD. Now the flippers don't work
(likely not related to Color DMD installation IMHO).
1) ALL Switches register in diagnostic switch test including
door, both flipper buttons and flipper EOS.
2) ALL coils work in diagnostic mode (except flippers).
3) ALL flipper fuses are good
4) 74V at ALL flipper terminals
5) Both Flippers DO operate if alligator clip grounded from their respective
ground tabs to the side rail (both Strong and Hold, both left and right).
SO, CPU "sees" flipper buttons, all circuits are working....
CPU apparently is not grounding the coils to fire them???
What am I missing here???
Ron Kral
CARGPB #23
What power source does the colour DMD use? If it is one of the game's supplies, then unplug the new and put the old DMD back and see if the problem goes away...
John :-#)#
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
On Wednesday, April 14, 2021 at 10:00:41 PM UTC-5, John Robertson wrote:This was a good suggestion to remove the new Color DMD from the equation.
On 2021/04/14 5:31 p.m., Ron Kral wrote:
I've got a Junkyard which was working perfectly last week.
Installed a color DMD. Now the flippers don't work
(likely not related to Color DMD installation IMHO).
1) ALL Switches register in diagnostic switch test including
door, both flipper buttons and flipper EOS.
2) ALL coils work in diagnostic mode (except flippers).
3) ALL flipper fuses are good
4) 74V at ALL flipper terminals
5) Both Flippers DO operate if alligator clip grounded from their respective
ground tabs to the side rail (both Strong and Hold, both left and right).
SO, CPU "sees" flipper buttons, all circuits are working....
CPU apparently is not grounding the coils to fire them???
What am I missing here???
Ron Kral
CARGPB #23
What power source does the colour DMD use? If it is one of the game's supplies, then unplug the new and put the old DMD back and see if the problem goes away...
John :-#)#John is right. Easy test. Unplug the color DMD, and play a game blind. If it works, get a separate power source for the color DMD.
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
LTG : )
On Thursday, April 15, 2021 at 1:18:56 PM UTC-4, originalll...@gmail.com wrote:
On Wednesday, April 14, 2021 at 10:00:41 PM UTC-5, John Robertson wrote:This was a good suggestion to remove the new Color DMD from the equation.
On 2021/04/14 5:31 p.m., Ron Kral wrote:John is right. Easy test. Unplug the color DMD, and play a game blind. If it works, get a separate power source for the color DMD.
I've got a Junkyard which was working perfectly last week.What power source does the colour DMD use? If it is one of the game's
Installed a color DMD. Now the flippers don't work
(likely not related to Color DMD installation IMHO).
1) ALL Switches register in diagnostic switch test including
door, both flipper buttons and flipper EOS.
2) ALL coils work in diagnostic mode (except flippers).
3) ALL flipper fuses are good
4) 74V at ALL flipper terminals
5) Both Flippers DO operate if alligator clip grounded from their respective
ground tabs to the side rail (both Strong and Hold, both left and right). >>>>
SO, CPU "sees" flipper buttons, all circuits are working....
CPU apparently is not grounding the coils to fire them???
What am I missing here???
Ron Kral
CARGPB #23
supplies, then unplug the new and put the old DMD back and see if the
problem goes away...
John :-#)#
LTG : )
Sadly, it didn't work - even with the new color DMD disconnected, the flippers still don't work.
This just seems almost impossible. As I noted before, ALL flipper buttons register as working in
diagnostic mode, AND I can "manually" cause the flippers to work by shorting the flipper
tabs to ground. It's like the CPU "sees" the flipper button, and "tries" to close the circuit,
but something is preventing that from happening. Buttons work. Flippers work. All other
coils work. What's in the flipper circuit that's not in the other coil circuits?
I've got a Junkyard which was working perfectly last week.
Installed a color DMD. Now the flippers don't work
(likely not related to Color DMD installation IMHO).
1) ALL Switches register in diagnostic switch test including
door, both flipper buttons and flipper EOS.
2) ALL coils work in diagnostic mode (except flippers).
3) ALL flipper fuses are good
4) 74V at ALL flipper terminals
5) Both Flippers DO operate if alligator clip grounded from their respective ground tabs to the side rail (both Strong and Hold, both left and right).
SO, CPU "sees" flipper buttons, all circuits are working....
CPU apparently is not grounding the coils to fire them???
What am I missing here???
Ron Kral
CARGPB #23
On 4/14/21 8:31 PM, Ron Kral wrote:
I've got a Junkyard which was working perfectly last week.
Installed a color DMD. Now the flippers don't work
(likely not related to Color DMD installation IMHO).
1) ALL Switches register in diagnostic switch test including
door, both flipper buttons and flipper EOS.
2) ALL coils work in diagnostic mode (except flippers).
3) ALL flipper fuses are good
4) 74V at ALL flipper terminals
5) Both Flippers DO operate if alligator clip grounded from their respective
ground tabs to the side rail (both Strong and Hold, both left and right).
SO, CPU "sees" flipper buttons, all circuits are working....
CPU apparently is not grounding the coils to fire them???
What am I missing here???
Ron Kral
CARGPB #23
Ron, have you checked the ribbon cables? There is a ribbon cable that
goes from the CPU to the Fliptronics 2 board, then to the audio board
and onto the DMD board. Any chance you jostled that ribbon cable? It connects to J903. If you are off a column at any one of those boards,
it could mess things up, but you likely would lose sound and display, too.
The flipper buttons and EOS come into the Fliptronics board and through
that ribbon cable to the CPU. Since the CPU 'sees' those buttons, the
ribbon cable connection is likely good.
Since you have power to the coils, the power supply is OK. The coil
power is generated on the Fliptronics 2 board and connects to the AC via
the power driver board. Since you get power to the coils, that
connection is likely fine.
But it still gets +5 V and +12 V from the Power Driver board via J904.
That is likely OK, since I doubt the circuitry would detect the flipper
and EOS switches via the CPU without those voltages.
The coils get the power from J907 so that is good. But activation
occurs via J902, so look at that one.
Next to check would be U2 with a digital probe, I would think.
--Just to bring closure to this...
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