![]() ![]() ![]() MACHINE USED: This rule sheet was created using my HUO Star Trek Premium. It is freely distributable, as long as all references as well as the authors name and contact details remain with the document. It is also not aimed towards competitive play - tournament mode is not considered here.Īny additions are highly welcome - send them to Some of the facts presented here were already discussed on other platforms, and I've tried to give credit wherever applicable. With the release of the VE on the horizon, people will - again - be looking for one.ĭISCLAIMER: This is my first attempt to write a rule sheet (don't be too hard on me), and aimed towards the novice and advanced players, not pros. (c)2018 Georg "hiho" folks, seeing that its almost 5 years after it's release and we still do not have a comprehensive rule sheet for Stern's Star Trek, i guess its time to come up with one. The Stern Star Trek pinball machine rule sheet These are really hard to get nowadays and expensive as hell - make sure that the tube is really to blame before doing this. Simple, but expensive fix - replace the display tube. In that case the answer was quite easy - oxidation ate away one of the display connections within the glass tube. Looking at the schematics, we are looking for last strobe, the last digit of the display. Anyway, a new PIA is in place and voila - the missing display segments are back.Īlright, next up - the missing digit. ![]() When soldering in a new IC, always use quality sockets. Using a basic DMM - red lead to ground and black lead to probe the pins - revealed two pins that had different values than the rest. Using the schematics to trace back the missing segments, the culprit was most likely the 6821 PIA at U51. Swapping the cables over yielded the same results - its gotta be CPU. Therefore the display itself can be excluded as the source of the error -> we now know that the issue comes from the main CPU board or the display cable. Basically segments are triggered via 4049 Hex inverter IC and an UDN7180A (these fail quite often, but usually cause the "segment stuck on" problem).Īs a quick test, i swapped a know good display over from a "Game Show" and the issue remained. This problem is unusual most typically you see segments stuck on and not stuck off. For each digit being strobed, the corresponding segments are being triggered. The display tube is being strobed constantly so your eyes don't realize that the digits are not lit at the same time, but serially. ![]() Solution: Lets start with the missing segments - System 11 displays are controlled by strobes (which are all the 16 digits) and segments (eg the - in a digit). Replacing that obviously did not solve the issue, as it had popped the board again.Issue: The right display is missing two segments on each digit, plus the last digit is missing totally.Īs you can see, the last digit is missing (a zero) + the left two segments are missing. I found one shorted diode on the lower left upper PF drop target. I did some more digging and checked every single diode on those two switch rows. But triggering any other switch in that row was fine. From that point forward, triggering any of the 6 drop targets on the upper playfield, would trigger every switch in it's row. I reinstalled the board and everything was good until one of the upper PF Drop targets was triggered. So I went over everything on the pop bumper and the right and left kickers, Coils were good, diodes were good, switches tested fine. The damage suggested an issue on the special solenoids. I just had all the boards for a BK rebuilt. or more to the point, if I need to keep looking for another issue. I am trying to understand how something happened. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |