Cr321 and r338 values

Maybe try adjusting the MASTER level?

Good Luck

Other settings
Adjusting the master level You can adjust the level of the headphone and the stereo out by turning the MAIN VOLUME knob. The MAIN
VOLUME changes the analog signal level. This will also adjust the entire level of the MPC1000 digitally.
01. Press the [MODE] key and then the [PAD 10] (OTHER).
It switches to the OTHER mode.
02. Press the [F1] (GLOBAL) key.
The GLOBAL page will be displayed.
03. In the Master level field, set the level.
You will set the digital signal level, which will be sent out to the DA converter. The MPC1000 can output up to
32 sounds simultaneously. There is the great difference in the level when you play single sample and play 32
sounds. If you increase the value in the Mater level field, you can increase the entire level of the MPC1000 to
create more powerful sound with less noise. However, if you playback many sounds at the same time, the
level may be overloaded, which may cause distortion. If you decrease the value in the Master level field, you
can prevent distortion when you play many sounds at the same time. However, you cannot have a good
result in respect to the noise or punch of the sound. Set the appropriate value in the Master level field
depending on the application.

Just go to COMBI mode.



Press PAGE+. The display may look like this :
or

In the example above, A03 and A49 is a sound PROGRAM number.
OFF and OFF is a Layer 3 and 4, were not activated.
So in our example, we only activate two voices (two layers).
X5D can combine up to 8 voice. To view the Layer 5-8, press PAGE +.
To change the sound of your choice, move the cursor to the corresponding layer, use this button:


then change the value with the slider / value key (YES and NO):

You can also set the level of each layer.
Press PAGE + until a menu appears LEVEL.
Move the cursor and sets its value

I once had this problem. Turns on but no sound. I tested the fan next to the power supply and it ran rough like it was worn out. I found the fan on eBay A5010L12S and replaced the fan. The Stagepas 300 came back to life. This fan blows toward the power supply and the other fan sucks air to create a circulation of air inside the mixer.

The HIGHEST instance number I can find on the schematic is R337... I cannot find R338.

Could you be reading R336 instead? It is a 100 ohm, 1/4 Watt.

If this is not the one, please advise other components it connects to and I will try to figure it out.

NEVER increase or replace the fuse without repairing the unit. Further damage is likely if you do so.

Put a light bulb, say 150 watts in series with the power to the unit to act as a fuse that won't damage things while troubleshooting. The light will light and limit the current.

There are three 47mfd/63V electrolytics on the output module. I suspect one of those is shorted. Observe the correct polarity when replacing. C2 and C3 are most likely. Use my above suggestion with the light bulb and check the voltage across each of these. It should likely be in the 35 to 45 volt range though schematic doesn't show the value..

Try asking this on:

organforum.com

It sounds like you have a power supply problem. If you have some electronics background, take a look at the power supply and see if there are any caps that are bulging on top. That means there bad. Always replace with same values. Check all diodes,see if anything looks like its got hot or burnt. Trace back where the fan is soldered to the board. Try to fellow the traces to see what component they lead to, maybe a voltage regulator. Oh... do all this with it unpluged. If your not sure about doing this maybe you have a friend who knows a little about electronics and can replace components and solder. Well, I hope this is helpful.

The dial could have a desoldered pin or oxydized slider contacts. Try to resolder the pins, but if that doesn't solve it then you would need to disassemble and clean the internal slide contacts on the dial which can be a bit difficult, so the alternative is to replace the dial if you can find a spare one.

To bypass the dial (with fixed resistances) you need to know the resistance at each side of the dial when it is in the position that suits your needs (connect the snare to a working input, set the sensitivity as needed, mark the position of the dial).

The resistance can be measured with an ohm meter.
To be sure that the measuring will be accurate, it is ok to remove the dial from the circuit board (adjacent components may affect the measured value).
You should do the measuring on a dial that is good.

After you've removed the dial, set it to the position that you marked previously.

Measure the resistance between left and middle pin of the dial - this will be the value of the fixed resistor which you need to connect to the left and middle hole on the circuit board.
Now measure the resistance between middle and right pin on the dial - this will be the value of the fixed resistor which will be connected to the middle and right hole on the circuit board.

Now you need to get resistors which have the values that you've measured and solder them in place of a bad dial.

It is likely that the measured value will differ from the standard fixed resistor values. To achieve the exact measured value, you can connect two or more fixed resistors in series, just make sure that the added value of the fixed resistors for each side is the same as the measured value on each side of the dial.

Now you need to solder the fixed resistors to the circuit board and the modification is complete.

If you actually decide to do this modification and you're unsure about anything, just post me some feedback, i'll be glad to help.

Anyway, hopefully it is just a desoldered pin that you need to reflux.

Regards,

Triarcuate

It could be in the power supply, open the unit up and find the power supply. Look to see if there are any caps that are bulging on top. If they are, they need to be replaced. Look to see if any components are burnt or look like they have got hot. If you know how to use a meter check the values of the resistors and any transistors that just does'nt look right. Check for bad solder joints. If a solder joint looks dull it may be suspect. Hope this is helpful. Ps: replace all components with the same value, this is if you understand a little about electronic.