UGS-muse preamp GB

emyeuoi · 2016-11-14 12:14 pm

Hi Alex,

The resistor is 100 ohms... I take another waveform that should looks more clean

I tried other remotes and also to reprogram the remote.
The wave form is the same for all what I tried.

The +V is 3.18V. The output is normally high at 3.16V and drop at 1.8V when I send the signal.

I also rechecked the ARM but everything seems ok...I can't figure out where is the problem

Thanks and Regards,
Enrico

Alex_twn · 2016-11-14 12:22 pm

Hi Enrico,
Why the signal does not drop to 0? That is the problem, a 0 won't be detected.
What is your UcBoard PCB revision?

emyeuoi · 2016-11-14 12:29 pm

Hi Alex,
The board is V1.2. You make me curious now...

Alex_twn · 2016-11-14 12:59 pm

Ok then no problem this is the right version, V1.1 has a different pinout but nobody has some except me.
They work perfectly fine as well just the MCU pinout is a bit different so for a minute I had a doubt.
But I never shipped any so no worries.

Still I don't understand why the level is 1.8V or a logical 0...
If you remove the IR sensor do you have a 0? No short with a bad soldering to the neighborhood pin on the MCU? (89, 90, 91)

emyeuoi · 2016-11-14 1:18 pm

I dismounted the IR and I have more or less 0,8V of the out pad.

I rechecked carefully the pins but everything looks fine. The board with the exception of the remote control is working perfectly so I would be very surprised if the problem is in the ARM.

I would like to send you a picture but I don't have a good camera with me right now...

emyeuoi · 2016-11-14 1:31 pm

I tested the IR with the lab PSU at 3.3V.

At the output I have the same waveform with same values... can be the IR that is damaged?

Alex_twn · 2016-11-14 3:35 pm

You mean you have 0.8V on the MCU I/O (P5-2) without the sensor connected?
You can try changing the sensor yes if you have one.

Eric06 · 2016-11-14 8:51 pm

Example TSOP2436 IR receiver response to my RC unit (from testbench so not necessarily a valid RC5 or NEC IR commands):

An externally hosted image should be here but it was not working when we last tested it.

Signal commutes from 0 to 3.3V - yours seems definitely faulty.

Ine · 2016-11-14 9:54 pm

Is this right or wrong ?

Hi Eric06

I have flashed my Uc-board with firmware 2.5.
I save all my settings to: Settings 1.
Mine works O.K as long as I don´t disconnect the power-supply (Leave it in stand-by).
In stand-by all settings are there, and I can start it with the remote.
But If I disconnect the power-supply, I have to start it with the encoder switch, and restore settings 1.
Is this right /correct, or do I have a problem/fault ?

Best Regards
Johnny

emyeuoi · 2016-11-15 2:11 am

Bonjour Alex and Eric,

Sorry for the late reply but there are 8 hours between Korea and Europe

So, looking in the waveform my IR doesn't work properly. I don't have a new one, today I will order...

Alex, the 0.8V are measured in the pad of the pcb where is connected the IR output.
What should be the expected value there? I hope to do not touch the MCU

Thanks to both of you to help me in this troubleshooting... really appreciate!!

Best Regards,
Enrico

Alex_twn · 2016-11-15 3:09 am

Hi Enrico,
No problem we are almost on the same timezone as I am in Taiwan.
So you measure 0.8V on P5 pin 1 with the IR sensor removed? This is strange if it is the case. If the sensor is removed you should have 0.

emyeuoi · 2016-11-15 3:15 am

Hi Alex,

Good to know you are in Taiwan... at least we are in the time zone

Yes, I measured 0.8V in the pin1 of P5 with the IR removed. As per schematic the pin1 is directly connected to the MCU pin 90. I am crossing my fingers...

Alex_twn · 2016-11-15 3:21 am

Yes it is directly connected to the MCU pin so it is strange then.
That is why I was asking earlier you to check the pin on the MCU around this (89 & 91), make sure you don't have a small soldering short between pins.

emyeuoi · 2016-11-15 3:25 am

I am at work now but tonight I will try to take a picture of the MCU and post here.
I used a oven for the SMD parts and I didn't get any problem with the solder.
Actually the board works since the first power up...

Eric06 · 2016-11-15 8:51 am

Ine said:
Hi Eric06
I have flashed my Uc-board with firmware 2.5.
I save all my settings to: Settings 1.
Mine works O.K as long as I don´t disconnect the power-supply (Leave it in stand-by).
In stand-by all settings are there, and I can start it with the remote.
But If I disconnect the power-supply, I have to start it with the encoder switch, and restore settings 1.
Is this right /correct, or do I have a problem/fault ?

Best Regards
Johnny

Hi Johnny, if you want to start directly from your saved config 1, just make a long push on input1 button instead of starting from the encoder switch.
Note: firmware is 100% Alex's coding.

Alex_twn · 2016-11-16 7:14 am

I should write a user manual with all the hidden commands and shortcut. One day...
But it is also very easy to discover how it works by using it

Forane12 · 2016-11-26 6:03 am

Can anyone help me with a CNC file for the front plate of the preamp? This is the last thing I have left to complete to finish it and it would be of theremendous help if someone can share or even sell his file... thanks in advance