To make a long story short. I just repaired a booting problem that was related to the 3.3V supply.
It now boots and all functions seem to work fine . The only issue is no audio output from the Headphone jack and both R & L channel jacks, I went over all the troubleshooting in the owners manual and even all that looks fine. I updated the firmware, still no change? I would really appreciate your constructive opinions. Tomorrow Ill review the schematics and go from there. Any help would be great.
I am not 100% familar with this beast and I know little about its history.
Thanks all!
Cheers
I knew it was too good to be trueā¦ LOL.
Actually I was looking at the schematic just now, but your just too fast for meā¦ Yes getting oldā¦ Ill check that out tomorrow. I suspect that power supply supply issue took something out here also.
Donāt go away ,Ill be back !
Cheers 
what you mean - getting old ?!? 
Does that work?
Test entry
ā¢ MANUAL MODE:
Turn on the power while simultaneously pressing the
[REMOTE] + [o] (REC) buttons until the āMOTIF XSā is
displayed on the screen and release the buttons.
The following screen will appear and test mode will be
selected.
should show this screen:
Use the [DEC/NO] or [INC/YES] button to select a test
number.
Press the [ENTER] button to execute the test number
currently selected.
Go to Test 14 - sends a 1kHz tone to the outputs !!
Actually I tried that and and after Test Mode apears in RED letters under the Motif logo, there is nothing else. (I Waited 5 min) . I suspect supply problems in a section. If I have time today Ill get on it. Keeping my fingers crossed.
I did a little check today and at the DAC -IC8 pin 6 there is Data .Ill attach a pic on my little synth bench scope.
From there I looked at the voltage level at R82 and it was 4.2V and on TR11 B=0.7V, E=0V, C=0V
Next I scoped the out puts on the DAC pin 20-21-22-23 and I dont see anything ?
Maybe Ill look more tonight. Any ideas?
Itās also bugging me as to why the test menu does not come up.
I did load the demo sequence and tried to run that but still no audio output
TR11 B=0.7V, E=0V, C=0V ā that means MUTE is on ā¦ all outputs are shorted to GND.
Have to look at this circuit now (just above IC8) - the 4.2V = MUTE ON is the yellow line at the right - need to study how this works.
What are the voltages to the left of R50 and R59 and at Anode of D14?
Here is how it works:
Anode of D14 is at +5VD - if TR9 is closed then MUTE is at -12VA. If TR9 is open then MUTE is at +4.2V which is +5VD minus V D14 and a bit through TR9 ā that is what you are reading at TR11.
If TR9 is open then TR8 must be closed meaning that TR5 and TR7 must be open to cause that - hence must check what is at R50 and R59.
R50 goes here - ANMUTE (CPU-0) which to me reads as āAnalogue Mute from CPU-0ā
R59 same connector other side being MIDI Reset ?!?
Need to know these signals on R50 and R59 definitively.
Got a little more - that signal off R59 (RESET) comes from the DM board - maybe something stuck here due to the faulty 3.3V being 4.7V ā¦ maybe?!
Good day from Canada !
wow, you really impress me and a big thanks, Some of this is a great learning experience for me.
I took some readings with the Motif fully booted up and this is what I see.
R50= 0.0V
R59= 3.3V
Anode of D14 = 4.3V
R58= 11.98 V
I also see that Analog Mute on pin 1 of CN5 is coming from the CPU and the 1st thing that poped into my head like a nightmare is; that broken Cap that was located under the CPU.āC2628ā
I installed a 0.1uf chip capacitor. I hate the way there is no standard to write capacitor values as I was not 100% sure of what I used was correct. let me know please.
Ill have to pull the DM board to see what pin its attached to. I may be completly off track but better to be sure.
Thanks my friendā¦
PS. what should I see on CN5 pin 1 .? Do you know.
I just took a look at the MOtif āXS8ā DM board and C2628 is located under pins 11-12 of the Master IC. So I no longer think that has anything to do with itā¦ The CPU is completely at the other side on the XS8.
Back to the drawing boardā¦ haha
on page 243 CN615 pin 40 I canāt figure where it is going? ( TL624 )
Time to take a break
to be continued tomorrow.
Monday and Tuesday a Holiday . hahahahahaha
THANKS FOR ALL YOUR WORK, my friend.
Ill take a look on Sunday but checking the components IC401 & IC402 & IC403 is a bit over my head. I looked at the data sheets and there is some testing info there but I think being so cheap better to just replace them. Problem is Digikey only has IC403. IC401/402 are a three week wait from China
IC 401-402
IC403
What do you think about just replacing?
I donāt really undestand what activates this Reset. (If you can shed some light)
I took a look at the components in this area and I donāt see anything . Last night I went ahead and ordered from China as that is my only option. No one has the parts around me. I hate waiting . F (^&%&^$&$3
Like I said im getting old and running out of time. hahaha 
IC403 is just a simple Inverter - just check the voltage level on either side -voltage levels should always be opposite if working correct - ie if out is around 3.3V (Logic high) then input should be around 0V (logic low)
Just the 5VD input voltage attached to IC401 in combination with the ICE_RES signal going to IC402 ā¦ that goes to a DEBUG connector and is currently fixed to 3.3VD.
Any device or system that does sequential work via a given set of instructions needs to be ākickedā to start itās work at a known point of entry ā¦ these RESET pulses are nearly always done via a chip or circuit that has a built in delay to hold the RESET pulse for a short amount of time at a prescribed level (low or high) and then released to start the process.
So - we just need to evaluate why the RESET on the output of IC403 is stuck at the HIGH level.
As per datasheet - IC401 and IC402:
"ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR
WITH DELAY CIRCUIT (INTERNAL DELAY TIME SETTING)
https://au.mouser.com/datasheet/2/360/S801_E-1606001.pdf
And because the two ICās have outputs tied together they are of this type:
well, Ill see if I can take some readings but Iām quite sure the PCB cables will be too short to turn the PCB as the components are on the bottom side when installed. Maybe I can get something on the back side. I did order the ICās last night so that might be my only option.
Ill see what I can do and get back.
OK ā¦ I added some more above ā¦
Is your guess that one of these ICās is defective?
Afer looking at the board, I came to the conclusion that trying to take readings can result in damaging the board/ Ribbon cables ect. I will just wait for the new parts to arrive, and just change the 3 x ICās.
Ill take this moment to thank you very much ! I hope once I recieve the parts you will still take interest in helping or even better , the Motif XS8 will be working.
Cheers for a few weeks.
Take care wernersaurus
Hope it just works ā¦ thatāll best outcome !!
Have you looked to see if local is on?