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Showing results for tags 'repair'.
Found 5 results
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Hi I’m looking fir a scorpion 2 power wire as mine has to much corrosion on it, and corrosion has spread up the wires and ruined the crimps. Has anyone got one? Also would May consider a MPU to lol I know it’s a long shot. Thanks !
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Hi all, I've been lurking here for a couple of days and read up on much of what is available here on the Barcrest MPU3. Thank you so much Midibob for all the info you so freely shared! I have owned a Barcrest Royal Diamonds for years, acquired it in '97. It was missing a 7 segment display (easily built) and the battery was bad (easily replaced). No real damage to the board nor the transistors. One 74LSxxx was bad. When I couldn't figure it out I (get this) called Barcrest, got connected to their Technical Department and ended up talking to a guy who helped design this particular game! His tips quickly led to a faulty 74LS12 (if I remember correctly) and it has been playing ever since. Well, that is; it was stored in the back of the garage for the last couple of years and then, on trying it a couple of months ago, it wouldn't budge of course. I have some experience in repairing electronics, am a HAM, and have restored a couple of Solid State pinball CPU boards (most of 'm damaged by battery leakage). So, after reading up here on the MPU3 stories I tackled the RD last weekend. It was ever so simple... the battery was flat but when connected to a separate Power Supply it charged neatly and holds its voltage for at least a couple of days. Checking the Test Points with a multimeter and a service scope gave a funny reading on the RESET line: it stayed low. Well, the board should not be resetting continuously and a quick look at the schematic suggested bad transistors or a bad Tantalium cap. I do not have any of the transistors in my junk box, but a reasonably fresh 10uF Tantalium cap was. Replaced it and Presto! If life would only be so simple more often 😉 Tested the game this morning and after resetting all the readings seem to indicate everything is working. The only things left now: I have a wiring diagram for the Royal Casino which is probably very like the Royal Diamonds but I'd love one for the RD. Also, the green diamond lamps all light up just as bright as all the others but still they are poorly visible. I wonder if the glas is dirty on the inside? Hope this will do as an introduction. Now everything is running I'll probably won't be visiting daily, but I thought it only polite to let you know how the forum, the info and you people are appreciated! BartW. PS: Oh yeah, one thing that has been bugging me: what the heck is the 'Aerial' used for that is tied into the Harness??
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Hello I'm hoping someone can help me I have a maygay on the buses fruit machine. When it switches on it seems to set but when it gets to gameplay it resets itself and this happens every time. Hope someone can help
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could not find old thread that fault 1 started on, so started another tech - jpm mps2 fault 1 - machine sets up but no reel drives repair - replace D17 & D18, BZX85C24 replace IC7 & IC8, ULN2823 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx fault 2 - no lamps on column 15 repair - replace Q2, TIPP116 replace R2, 2R2 1/2 watt xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx fault 3 - no +12v, LD2 off repair - replace C64, 10uf 35v tant bead capacitor xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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Hi, I am attempting repair of an MPU4 board (MOD4 with sound chip) and almost there. The battery had eaten its way through all of the copper tracks under it, so I now have a mass of wire links over the board which has solved the non-working display and everything else except when it boots up it does not go into "open door" mode, it goes into normal play and essentially works fine, but I would like to be able to get it into test etc. Is there anything obvious i'm missing - please bear in mind i'm testing in a known working machine, so there is nowt wrong with the door switches, connectors etc. Perhaps someone could explain the circuit that detects the door open (I know its the left hand connections on the black plug PL5 and have checked continuity to IC22) Cheers Phil.
