superfeed Posted March 21, 2008 Report Share Posted March 21, 2008 Well, you all amaze me. I started with such high hopes more than a few years ago on a MBHP 64 project, then put it away as I got busy with other things. I feel technically inept. I thought that I should complete the box for better or worse, so I determined to make the box work (this might be my mistake).I am using a Smash TV board, pic, and components that I purchased 3.5 years ago.The pic is labeled MIOS_BOOTSTRAP_v1_1BAll 0's underneath.I have attempted to use MIOS Studio to upload: update_without_installed_mios.hexWhen I start the upload with:Device id 0"Wait for upload request before starting upload" checkedand Smart modeI receive the following message:Starting upload of update_without_installed_mios.hexHex file contains code in MIOS range, forcing reboot!Received Upload RequestSending block 00000000-000000FFError: Received unexpected Upload Request(Sending block and Error repeated until abort)I tried the following from the midi troubleshooting guide:TEST IN1: OkTEST IN2: OkTEST IN3: LED stays lit (even with no message coming in?)TEST IN5: OkTEST IN6: LED stays lit regardless of switch positionThank you for any help in advance. I should have just stuck to playing guitar. :PJohn Gregory : Quote Link to comment Share on other sites More sharing options...
TK. Posted March 21, 2008 Report Share Posted March 21, 2008 You selected the right .hex file, thats a good starting point! :)The issue looks similar like this one, but this time the LED lits. However, I think the reason is the same: visually check the circuitry around the optocoupler. TEST IN7 allows you to doublecheck, that the optocoupler itself isn't failing (e.g. because of a defect)Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
stryd_one Posted March 21, 2008 Report Share Posted March 21, 2008 I helped someone out with a midi input issue yesterday and they had these same test results, and it passed test 7 also - but when he tried a new opto, everything worked OK... Quote Link to comment Share on other sites More sharing options...
superfeed Posted March 22, 2008 Author Report Share Posted March 22, 2008 Thank you Thorsten.I performed TEST IN7 on optocoupler.switch open/cable not connected = 5Vswitch closed/cable connected = 2VThis means 6N138 is defective?John Quote Link to comment Share on other sites More sharing options...
superfeed Posted March 22, 2008 Author Report Share Posted March 22, 2008 Thanks Stryd,Are there many defective optocouplers, or is it possible I damaged it?John Quote Link to comment Share on other sites More sharing options...
stryd_one Posted March 22, 2008 Report Share Posted March 22, 2008 It does sound like yours is broken :( They do seem to be a problematic part, well, more so than any other part. They seem to be very sensitive to heat or shorts, but sometimes just die for no reason. Quote Link to comment Share on other sites More sharing options...
nILS Posted March 22, 2008 Report Share Posted March 22, 2008 The opto coupler is probably the easiest-to-destroy part in the midibox universe ;)edit: beaten. Quote Link to comment Share on other sites More sharing options...
superfeed Posted March 23, 2008 Author Report Share Posted March 23, 2008 Thanks, AllI've ordered 5 from Mouser.I Appreciate the help.John Quote Link to comment Share on other sites More sharing options...
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