The door area in the center of the playfield was designed to use 4 flashers, using two small circuit boards for flash lamps under the large door panel.
This design is still in the manual, and shown in the red prototype panel.
(Pictures from HEP gallery.)
During the conversation with Jimakost (he is doing a cool TZ scratch build), he mentioned that he is looking for lamp boards, including a door lamp board. My goal was to create a door panel with the integration of 4 flashers, operated by 4 different playfield flashers.
Aftermarket mods with small PCB only replace the GUM and BALL flashers, that's the only chance for sample/production games, only 2 holes are available for flasher extension.
The LOCK 1-2 flashers cannot be installed into these boards (unless you are ready to hack it) - there is no hole on the PCB for extra flashers.
Few years ago GLM introduced a lamp board with 4 flashers - however the control was based on only 2 playfield flashers (GUM, BALL), not 4.
My door panel contains all feature lamps (original twist-in design for bulb or LED's) and the 4 flasher area, controlled by 4 flashers as per designer's intention. Every insert area contains 4 small LED flashers for even light distribution, and the feature lamp remain in the center. Connection to factory lamp harness via plug&play harness, no soldering required.
In case of flasher activity*, the door panel flashers are also activated.
(*These 4 flashers)
Upper left insert, GUM -》upper left ramp flasher
Upper right insert, BALL -》upper right ramp flasher
Lower left insert, LOCK 1 -》pop bumpers flasher
Lower right insert, LOCK 2 -》upper right flipper flasher
Price of lamp board with built in flashers is $120 shipped. Kit contains board and plug&play harness (no sockets, no spacers).
Thanks to coyote for clarification of flasher locations.