Dificulty with mios upload

Testing/Troubleshooting
1

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_1B

All 0’s underneath.

I have attempted to use MIOS Studio to upload: update_without_installed_mios.hex

When I start the upload with:

Device id 0

“Wait for upload request before starting upload” checked

and Smart mode

I receive the following message:

Starting upload of update_without_installed_mios.hex

Hex file contains code in MIOS range, forcing reboot!

Received Upload Request

Sending block 00000000-000000FF

Error: Received unexpected Upload Request

(Sending block and Error repeated until abort)

I tried the following from the midi troubleshooting guide:

TEST IN1: Ok

TEST IN2: Ok

TEST IN3: LED stays lit (even with no message coming in?)

TEST IN5: Ok

TEST IN6: LED stays lit regardless of switch position

Thank you for any help in advance.  I should have just stuck to playing guitar.

:stuck_out_tongue:

John Gregory :

2

You selected the right .hex file, thats a good starting point! :slight_smile:

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.

3

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…

4

Thank you Thorsten.

I performed TEST IN7 on optocoupler.

switch open/cable not connected = 5V

switch closed/cable connected = 2V

This means 6N138 is defective?

John

5

Thanks Stryd,

Are there many defective optocouplers, or is it possible I damaged it?

John

6

It does sound like yours is broken :frowning: 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.

7

The opto coupler is probably the easiest-to-destroy part in the midibox universe :wink:

edit: beaten.

8

Thanks, All

I’ve ordered 5 from Mouser.

I Appreciate the help.

John