Author Topic: Gottlieb Sys 1 tilt working intermittently  (Read 4969 times)

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Offline onetaste

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Gottlieb Sys 1 tilt working intermittently
« on: May 03, 2018, 08:19:31 PM »
Did you repin the connectors to the new Pascal board ?

Is the ball roll assy wired correctly ?
Yes, everything repinned at the board. Ball roll assembly ok.

I have spoken to Pascal, there is a diode which I missed, here is what he says:

there are two TILT assys: one under the playfield and one in the cabinet.

each has its own diode.

the diodes for the TILT pendulum & coin door are shown on the transformers schematics page = the page before the one you showed me:


for the coils, 1N4004 are fine (NOT 1N4148, too weak !) for the switch matrix, both diodes must not be used.

it’s a matter of voltage threshold. the original 1N270 germanium diode has a threshold of 0.3V while the 2 diodes you mentionned have a threshold of 0.7V. If you install these switch hits may not register.

any faulty switch matrix diode must be replaced by a schottky diode, like BAT42 BAT43 BAT85. This is true on the original board and my board.
« Last Edit: May 03, 2018, 08:23:13 PM by onetaste »