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Number 20 bonus light out on playfield

Pinballwizard68

New Member
Jan 20, 2018
2
0
1
56
Victoria British Columbia
Hello friends. I have a Gotlieb Panthera pinball machine and have a problem. The number 20 on the playfield(bonus) is out and I've tried changing the bulb to no avail. Any suggestions would be greatly appreciated because I have no clue about electrical stuff. Thank you.
 

sylvain

Active Member
Apr 27, 2013
214
82
28
Ottawa, ON
One bulb not working on Gottlieb System80 pinball machines can be anything from this list:
- bad bulb socket
- wire or ground braid to that particular bulb socket broken-off somewhere
- bad pin in connector header on the driver board for that lamp
- bad drive transistor for that bulb on the driver board (easier to find-out which transistor with the game manual)

Some level of electrical troubleshooting and knowledge would help to fix this.
Plus for safety...

Note: Never unplug or reconnect connectors on boards with the machine powered ON,
or poke under the playfield with a metal tool... or serious damage can occur on boards.

Good luck!
-Sylvain.
 
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Pinballwizard68

New Member
Jan 20, 2018
2
0
1
56
Victoria British Columbia
One bulb not working on Gottlieb System80 pinball machines can be anything from this list:
- bad bulb socket
- wire or ground braid to that particular bulb socket broken-off somewhere
- bad pin in connector header on the driver board for that lamp
- bad drive transistor for that bulb on the driver board (easier to find-out which transistor with the game manual)

Some level of electrical troubleshooting and knowledge would help to fix this.
Plus for safety...

Note: Never unplug or reconnect connectors on boards with the machine powered ON,
or poke under the playfield with a metal tool... or serious damage can occur on boards.

Good luck!
-Sylvain.
Thanks for your advice!