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Hi everyone! Forgive me if this post is in the wrong place. I recently picked up a tired looking Barcrest MPU5 machine, Golden Dragon. Strangely enough i love playing this machine and other Barcrest's of it's era more so than any modern machine. Aquiring this machine has lit a fire within me and i'm loving working on it to get it restored and in tip-top shape again. I've dabbled with fruit machines in the past, power supply repairs, general maintenance etc but this was many years ago but picking this machine up has reestablished some enthusiasm lol. Now i've gone through it and replaced all the knackered bulbs, tidied the cabinet, replaced a sticky reel mechanism, and it's running... However: it's that age old problem of being stuck in freeplay mode. Powered up it states DOOR 78:00 which after a quick refresher search on this fabtastic forum i established that it is indeed a door switch issue as it implies. Should be easy to sort you'd think! Well it's got my head in bits lol. I'm not overly familiar enough to realise what's wrong, but i do believe someone has been playing a game of switch-the-wires on the lower cabinet panel switch. 6x contacts on the switch, comprising of two independant switch circuits with NC/NO/COMMON. Simple right? Well the orange and blue go to NO/NC and the COMMON is not even used, and the other switch side has red and white to NO/NC with the COMMON unused. I'm assuming this is wrong! Surely the switch won't function without the common used, as it's meant to switch the common through to the other wire depending on whether you want it normally open or normally close. So i swtched it to make more sense and put one wire on each side to the common and one to the normally open pins. No change, still DOOR 78:00 when powered up and pressing start adds credit and begins freeplay. I then looked over to the top overhead cabinet and that does indeed use the common, again with a red and white wire set and an orange and blue wire set. There are some spurred off wires from the red and white which jump to green wires with push fit insulated spades - not sure of their relevance. I assume this switch is ok, the cabinet knows when the overhead upper cabinet front is lifted. Now someone has removed the actually locking barrel to the overhead, the mechanism slides and locks it shut but there is no barrel plate to 'lock' it shut. There is a small paddle switch near the missing lock barrel which i assume is to possibly detect if you have physically locked the unit with a key? I have tried taping the paddle down to close the switch but again, still have DOOR 78:00 message and freeplay. On the rear of the cabinet is a 'hopper refilled' button, and at the bottom near the cash drawers is another switch possibly labelled by a nearby sticker saying hopper dump. There appears to be a panel of wood missing here, does this need to be there to hold the hopper dump switch in? I believe the dump switch only dumps the hopper if you press it following a sequence involving pressing start but does it also double up as a cash drawer closed/enclosed switch sensor? Again, holding it in does nothing and the DOOR 78:00 remains. There is one final hidden switch tucked up on a dividing wall inside the cabinet with no label and in a very strange and awkward position. I also noted that by the PSU there is evidence that another unit was once installed and has now been removed, as there were additional earth straps, a red and black (power?) pair of wires that once traced go to the MPU5 but were not wired to anything else and seemed to trail the cabinet as a spare power source point in multiple locations (?) and finally two cut green wires (traced and went no-where so carefully removed) and an orange and blue pair also cut which go to an alarm led in the cabinet that is not connected. What has been removed? The wiring isn't connected anymore so should have no effect on the unit but i'm wondering if alterations to the cabinet switches may have been made... The machine plays ok in free play and no other errors come up. I successfully changed the jackpot and stakes back to what they should have been on, and believe i have reset/cleared the hopper levels by following a procedure i read although i haven't filled the hopper up with any coinage. I really need to verify the upper and lower cabinet switch and establish why the machine is so insistant that a door is open but i'm not fully familar with the other switches. I thoroughly appologise for sounding like an idiot or someone who shouldn't be touching these things... i just need to get my head round a few basics. I am unable to source a manual for the machine as i believe Barcrest had model specific manuals rather than a manual for machines in the same design series. I did find a MPU5 manual but it doesn't give pinout information for the cabinet switches. Can anyone spare me the time just to help me familiarise myself with the other switches, like near the latch barrel (whether it is relevant or not etc) and kind of point me in the right direction for continueing and diagnosing? I really want to learn and get involved just i've been a bit overwhelmed with too much general information that i can't apply here. I can take some pics if iit helps. Perhaps i've overlooked something so simple! Lots of questions in my post, sorry i haven't kept it simple. I have an inquisitive mind lol. Thankyou for taking time to read this Drew