The two diodes D4 & D5 are silicon switching diodes, number 1S1588. They can be found on eBay but obsoleted at most electronics suppliers. An acceptable alternative is the 1N4148.

As far as checking the continuity of all the circuit traces, doing so will test your patience. Each one of the traces from the CPU (Z80) to the Eproms and RAM all have to be rung out. Yesterday I started working on the same board you have with similar symptoms and so far have found three open traces on the bottom side of the board, just below the battery. Appear to be from a combination of weak solder joints, battery acid, heat and old age. The solder joints have been repaired and the board now boots to the Error 12, same as yours. The Eproms and RAM tested good, battery circuit's good so I suspect there's a problem with the memory decoder chip (74LS139) or related chips as the system rom is loading but the game rom is not. I'll keep you posted on what I find.

So although replacing the switching diode may alleviate one problem there still may be an issue with the ROM or RAM loading. Try the diode first to see if that restores play.  PM me your email address and I'll send the information to check the traces.

Hello everybody,

I´am searching for the following topper inserts / plastics for an Aristocrat Relm topper:

"Make that Cash" (please see the attached picture)
"Fu Dai Lian Lian Panda"
Or any kind of "neutral" one for example with Aristocrat logo, "New game" / "Hot game" ... design.

Thanks a lot for any help.

Yes, normal, try moving the wires to the other switch.

I am not an electronic specialist nevertheless the battery voltage is 3.8V and the diode D5 is bad. the diode D4 is good. To help me to check can you show me where is the 6116 ram and if there is specific points I must control. Can you tell me the specifictions for the diode D to buy a new one.

I looked at the main door switches this morning.   Only one is connected.   Can you confirm if this is correct and the wiring is connected properly?