[jimkeaney]

So the one thing Skidmorebay didn't mention with his success to wiring the Avago encoder was that the blue "ground" wire does need to be attached. Maybe that's assumed, but I was being cautious. Anyhow, I attached it on the point labeled -12V and I'm feeding the center pin 5v from the left side of R15... now everything works as it should. Not sure if the wire labeled "Shield" needs to go to ground as well, but for now, I'm leaving it off. The model encoder I bought was this one found on ebay  HRPG-AD16 #16C http://www.ebay.com/itm/390121123473?rmvSB=true  As you can see (in my attachment) I removed the metal bracket and moved the ribbon cable out from underneath. It is now exactly 10mm in height. Juuust fits 

 

[Janzoulou]

Hi everybody. I recently had o change the rotary pot. It is working fine but the input and the output select are not doing anything. Checked solderpoints... all seem to be fine. Any ideas? Thy a lot! 

Edit: The unit is passing audio and the attenuation is also working. Mono  and talkback are also functional. Only the input/output-selction doesn't.

[Moby]

Rotary pot=Encoder? If yes it cant be directly connected with select buttons. Check the solders at  sub-d or maybe u have some solder dropped on pcb

[Janzoulou]

Yes, of course, encoder. So it can be that there is a connection between the encoder and the select buttons? Would this result in dysfunctionality?

[Moby]

Yes, of course, encoder. So it can be that there is a connection between the encoder and the select buttons? Would this result in dysfunctionality?

i really doubt. Encoder  just adds up/down info to the Pic

[Janzoulou]

Yes, of course, encoder. So it can be that there is a connection between the encoder and the select buttons? Would this result in dysfunctionality?

i really doubt. Encoder  just adds up/down info to the Pic

Thanx for the quick answer!!

I checked and resoldered them.. no change. So when I switch on the CRM level, mono, TB are working fine. SPK 1 /Input 1 passing audio but none of them switchable... I did a quick vid:

https://www.dropbox.com/s/jthrrmt0crtafow/2016-01-04%2016.59.09.mov?dl=0

Can it be that the micro controller is gone?

[Janzoulou]

Now it went even worse. It fires up, goes to saved state (CUT + INPUT 1) and from there nothing is happening anymore.

If the EPROM goes to saved state, does that mean that it is working or can it be that it is gone?

Thanx in advance for helping out... I´m in real trouble as this is the heart of the studio...

[rob_gould]

Now it went even worse. It fires up, goes to saved state (CUT + INPUT 1) and from there nothing is happening anymore.

If the EPROM goes to saved state, does that mean that it is working or can it be that it is gone?

Thanx in advance for helping out... I´m in real trouble as this is the heart of the studio...

I don't know about your issue, but when I had a failed EPROM, the LED screen and buttons were completely dead - nothing lit up at all.

One other thing you may not already have seen - the instructions from Igor on how to reset the EPROM.  They are in this post :

http://groupdiy.com/index.php?topic=30914.msg510069#msg510069

I guess it's worth a try just to see if the behaviour of your unit changes.

Also, I have a copy of the hex code to flash a new EPROM if you need it.  I have never tried it, but it is the one supplied by Silvas a few pages ago...

Good luck...

[Janzoulou]

Hi Rob!
Thanx for responding!!
That´s what I did. (Reset the EPROM). It did not change the behavior. Then I resoldered a few points, (for example RN2). Now it is getting into CUT+IN1, as described and then nothing is working. Not the Encoder nor any switch responds.

Seems like there is something missing on the board. The voltage is as it should (12V and the regulator is on 5V)...

[rob_gould]

If you haven't seen it already, but there's a small amount of additional troubleshooting info which Igor provided to me when I was trying to fault find my CRM. 

http://groupdiy.com/index.php?topic=30914.msg520226#msg520226

This was the info which enabled Igor to tell the EPROM was dead.  Perhaps it'll help you...

[Janzoulou]

If you haven't seen it already, but there's a small amount of additional troubleshooting info which Igor provided to me when I was trying to fault find my CRM. 

http://groupdiy.com/index.php?topic=30914.msg520226#msg520226

This was the info which enabled Igor to tell the EPROM was dead.  Perhaps it'll help you...

I check it now. THX a lot!!

[Moby]

@Janzoulou.  has your CRM ever worked correctly? Sorry I missed that point?

[Janzoulou]

@Janzoulou.  has your CRM ever worked correctly? Sorry I missed that point?

:-) Yes since 3 years now. In perfect manners, day by day. Then the encoder died (it stopped  moving anti-clockwise, a mechanical fault)

I have checked the 5V on the EPROM and they are ok. Unfortunately i don't have a scope, so I can't check the pulses. But somehow I got a feeling that the pull-ups (RN2) are faulty. I will replace them with this:

https://www.conrad.de/de/widerstandsnetzwerk-47-k-sip-81-0125-w-1-st-414271.html

[Moby]

You dont have to use sip resistors. You can replace it with the group of 4k7's. Just like Igor did on his protorype

[Janzoulou]

I know. It´s just laziness and I anyway have to go there... 

[Moby]

Here is the pic. I still can't believe it's broken PIC.  As someone mentioned before, dead PIC will cause totally wrong behaviour or no response at all.

[Janzoulou]

Here is the pic. I still can't believe it's broken PIC.  As someone mentioned before, dead PIC will cause totally wrong behaviour or no response at all.

Me to. And this is how I had installed them.

What is strange is the fact that it only is the upper switches (In-1-4 + Mon1-3).
All the other ones were working (Trim, mono, dim,TB)

Are there any special parts related only to these switches?

[Janzoulou]

Ok, SIP changed same behavior:

Powers up into CUT and from there nothing works, no response at all.

EDIT:

to describe better: When powering up the LED´s are shortly showing U20 (Version 2.0) and then the nit switches into CUT and IN2. then it is not responding at all. Does that mean the EPROM is still there or can it be it is gone?

[Janzoulou]

SOLVED

It was the PIC. Thanx mates, for helping out!

So it is official: the hex-file does work and, if the PIC is loading the software but freezing it CAN be that the PIC is gone.

For anybody interested, here in Berlin there is a service, burning HEX-files into PIC´s for 5€.
I used this PIC http://www.distrelec.de/de/mikrocontroller-bit-dil-40-microchip-pic18f4620/p/17379392?wt_ga=18078709831_69647412511&wt_kw=18078709831_pic18f4620&gclid=COyAtdWBkcoCFSsOwwodhVQOzA

and they did burn it for me:

http://www.segor.de/#/dienstleistungen/16-Programmierservice/

Now it would be amazing to extend the functionality to be able using DIM as real CUT... any ideas? LOL

Glad that I can go back to work...

 

[Moby]

Great! I learned something new

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