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Prophet-5/10 Module Troubleshooting

If the unit is not booting:

CHECK BOOTLOADER OPERATION AND RELOAD OS

  1. With the unit powered off, plug a 1/4" TS cable between the GATE IN and GATE OUT jacks on the instrument, then power the synth on. 
  2. You should see 'btl' displayed on screen indicating bootloader mode is active.

  3. Send the main OS file to the synth via MIDI IN port (USB cannot be used in bootloader).

OS file and installation instructions

 

If the unit boots but has an issue, perform initial settings first:

INITIAL SETTINGS

  1. Start by removing all connections (MIDI/USB, pedals, audio) from the rear of the instrument except for power. 

  2. Reset global parameters: hold RECORD and press GLOBALS. No confirmation of the reset will be shown on-screen, but the global parameters will be set to the factory default.

  3. Press GLOBALS twice to exit the global menu.

  4. Initialize a basic program: hold RECORD and press PRESET.
  5. Connect a MIDI keyboard via MIDI IN.
  6. Connect a set of headphones to the headphone output.

Next, proceed to the appropriate section below according to the issue described:

 

I. Audio Issues (voices not triggering or not sounding correctly)

A. Perform Initial Settings

  1. Verify if the issue is still present. If so, proceed to step B.

B. Oscillator/Filter Calibration

  1. Start Calibration: Press TUNE.

  2. Calibration will start and progress will be shown on the screen.  

  3. If calibration stalls/does not complete, take note of the text on the display.

  4. If calibration completes and no problem is detected, reconnect audio cables to the instrument’s main outputs.

  5. Verify if the issue is still present. If so, proceed to sections C or D based on the problem description.

C. Distortion In Audio Outputs

  1. Is distortion present on headphone output? If so, turn on VELOCITY to AMP and play quietly.

  2. If no distortion is present on headphone output, verify correct cables are in use (TS unbalanced) and that the instrument is connected to the appropriate audio interface/mixer input (Line level input).  

  3. If distortion is still present, check the instrument with another set of cables and audio interface/mixer inputs.

  4. If distortion is still present on the Main L/R outputs, reduce VOLUME to below 50%. If distortion ceases, this indicates that repair is necessary.

D. Output Level Mismatch

  1. Differences in output level between the left and right main outputs of 1-2dB are within expected tolerances. This is due to the analog nature of the amplifier circuitry in our instruments.

 

II. Tuning Issues

A. Perform Initial Settings

  1. Verify if the issue is still present. If so, proceed to B. If the issue is still present after step B, proceed to step C.

B. Oscillator/Filter Calibration

  1. Start Calibration: Press TUNE. Wait for the routine to finish.
  2. Check if the tuning is immediately better after completing calibration. If so, run calibration over a larger range of operating temperatures.

  3. Repeat calibration whenever you notice tuning instability: upon power on, after it's being on for a period of time, and when there is any environmental/temperature change. Over time and as a larger number of calibrations are run, you should not need to calibrate as often.

**If calibration does not complete successfully, check the FILTER input on the rear of the unit. If a pedal is connected, remove the pedal are attempt calibration again.**

 

C. Clear Oscillator/Filter Calibration

  1. Clear Calibration: Hold RECORD and press TUNE.

*Note that no on-screen confirmation of the clearing will be displayed. After clearing calibration data, you will need to run calibration extensively to stabilize the tuning.

 

III. MIDI Issues

A. Perform Initial Settings

  1. Verify if the issue is still present. If so, depending on the description of the problem, proceed to step B, C, D.

B. Instrument Not Outputting MIDI

  1. Press GLOBAL once, then press 7 to select MIDI OUT and verify it is set to the port being used to transmit MIDI data.

  2. If it is not set to the correct port, use the INC/DEC buttons to set MIDI OUT to USB or MIDI.

  3. Press GLOBAL twice to exit globals.

C. Instrument's Voice Count is Halved

  1. Check for a MIDI feedback loop. When the synth is actively connected to a DAW via USB or MIDI, turn LOCAL CONTROL off with steps 2-4.
  2. Press the GLOBAL button once, then press 8 to select LOCAL CONTROL.  

  3. Use the INC/DEC buttons to set LOCAL CONTROL OFF.

  4. Press GLOBAL twice to exit globals.

D. Pots Not Updating Correctly

  1. This is due to a MIDI feedback loop. When the synth is actively connected to a DAW via USB or MIDI, turn LOCAL CONTROL off with steps C2-4.

 

IV. Button Issues

A. Perform Initial Settings

  1. Verify if the issue is still present. If so, proceed to step B.

B. Button Cleaning Routine

  1. The buttons on our instruments are self-cleaning. In most cases, buttons that are intermittent/non-operative can be resolved by being fully depressed 50-100 times.

  2. If the operation improves but is still intermittent, repeat step B1.

 

V. Pot Issues

A. Perform Initial Settings

  1. Verify if the issue is still present. If so, depending on the description of the problem, proceed to step B or C.

B. Pot/parameter Value Changes On Its Own

  1. Turn the pot back and forth across its full range of travel 50-100 times.  

  2. Set pot to minimum or maximum setting and check whether pot/parameter continues to change on its own.

  3. If it does not, set the pot to its midpoint and check whether the pot/parameter continues to change on its own.

  4. If the parameter continues to change on its own, the pot requires replacement.

C. Pot Feels Wobbly

  1. Excessive horizontal pressure applied to a pot may cause the pot shaft to loosen within the housing of the pot’s enclosure. It is advised to not apply excessive non-axial force when turning a pot.

  2. If the pot works correctly to set value (no jumps in value or value change without physical movement), then the pot is working correctly and no fault is present.

 

HOTKEYS

Basic Patch: Hold RECORD and press PRESET

Display Main OS: Hold Global and press 1
Display Panel OS: Hold Global and press 2
Display FPGA OS: Hold Global and press 3

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