RMweb Gold big jim Posted November 29, 2011 RMweb Gold Share Posted November 29, 2011 spent this evening fitting up my Bachmann MPV with a V3.5 sound chip courtesy of bryan at howes, took a few pics of the fit for anyone who may want to do it themselves... here is the new unit, first time out of the box the modules are already loose in the box on a plastic tray the unit with the modules removed showing the motor and circuit board the circuit board with blanking plate the other side showing the speaker holes, no tags like the 47 on this one so the speaker leads need to be soldered to the board underneath the unit you need to remove the plastic moulding representation of the engine to put a speaker in place you will also need to remove the spring on the inner end that it attached to the coupling underside of the unit with the moulding removed, speaker space is on the left inside theplastic moulding showing the holes for the sound to escape here on it i noticed a potential problem....... this is where the speaker is supposed to be fitted, looking at it the speaker should be mounted facing upwards but this is where the problem lies, there are solder tags on both sides of the chassis which are for the motor pickups put a speaker in place and the metal housing sits right across the tags which i recon would cause a short on the chip and possibly blow it, i didnt want to find out!! the width of the bottom moulding also prevents you fitting a speaker housing i even gave a dcc supplies bass enhanced speaker a try but that didnt fit, i had to melt a bit of it to get past the lugs but to no avail... ....because as you can see its too deep, the inner moulding should be level with the outer frame in the end i fitted the standard speaker facing downwards, not sealed it yet though, just held in place with a sticky pad for now, will replace it with a blacktak ring when i get a new roll of it back to the circuit board, soldered the speaker cables to it fitted the chip, as i say this is a 3.5 chip testing time before i put it all back together plastic centre moulding back in place dont forget the little spring, the easiest way is to remove the bogie and stretch the spring back job done, obviously then put the bogie back on (picture not uploaded for some reason!) onto the rolling road and ready to test again Here are the functions...... Â F0. Â Â Lights on /off F1. Â Â Sound on/off F2. Â Â Playable 2 toneHorn1 F3. Â Â Playable 2 toneHorn2 F4. Â Â Playable Horn3 F5. Â Â Buzzer F7 Â Â Playable Siren F8. Â Â APU engine F9. Â Â Water jet engine and spray noise F10. Â Flange squeal in the above video the water jet can be heard operating independently after i shut the engine down the above chip is available new on a V4 chip via howes and can also be reblown onto V3.5 chips (as i have had done) Link to post Share on other sites More sharing options...
pitbull1845 Posted November 29, 2011 Share Posted November 29, 2011 Nice work Jim, thanks for the step by step photos. Sounds really good , especially the siren!! Link to post Share on other sites More sharing options...
The Black Hat Posted December 4, 2011 Share Posted December 4, 2011 hate to ask the really obvious question but when use the siren? Start of spraying, but that sounds daft if your already running at speed.... Link to post Share on other sites More sharing options...
RMweb Gold big jim Posted December 4, 2011 Author RMweb Gold Share Posted December 4, 2011 to be honest i havent got a clue what the siren is used for, its certainly not used while spraying, all i know is bryan recorded it off the unit so put it on the chip! Link to post Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.