Rhodes Chroma Polaris

Thank you this is extremely usefull stuff.
Can't wait for the .pdf file now. :)

> -----Original Message-----
> From: bkuris [mailto:benjamin.kuris@...]
> Sent: Wednesday, August 04, 2004 6:05 AM
> To: chromapolaris@yahoogroups.com
> Subject: [chromapolaris] Diagnostics
> 
> 
> This is going to be fairly long-- I'll try to make a .pdf of the 
> actual manual soon.  For now I'll abbreviate:
> 
> Diagnostic readouts:
> Lower Function - D - 1:  displays charge on battery in right column 
> of LEDs in assignable control section.  Expect 4-5.  Replace cells if 
> less then 2 LEDs light.  If 7 LEDs light, the battery cap. is 
> overcharged which is usually an open between cell terminal and cap.
> 
> L F - D - 2:  flashes number led of revision of SW
> 
> L F - D - 3:  Turns on all LEDs to check LEDs and digital power 
> supply for max current.
> 
> L F - D - 4: (for bryon!) turns on LED above master slider when 
> master slider is positions to produce a value of 255.  This checks 
> out the range of the A/D convertor
> 
> L F - D - 12:  erases all memory.  don't do this!
> 
> L F - D - 10:  MIDI reset
> 
> L F - D - 11:  warm reset.  For minor glitches like stuck notes
> 
> L F - D - 12:  cold reset.  like toggling the power switch
> 
> *adjustments and checkout*
> Digital level: turn on all LEDs.  measure at P3 pin 3 and pin2 adjust 
> R9 for +5V (10mv tolerance)
> 
> Reference level: p4 pin 1 and p6.  adjus r5 for +5V within 10mV.
> 
> DC ok threshold:  back off R17 to minimum (full CCW) then turn 
> clockwise till LED CR10 lights.  Later models have a different design 
> w/no adjustments
> 
> ADC range (for slider!):  push master slider up to max and pull all 
> other sliders to minimum.  Press lower function D-4 and watchi the 
> LED in the master secetio nof the panel (volume/tune).  Turn R45 
> clockwise to maximum, then back off couterclockwise until LED 
> lights.  Continue turning CCW 5 degress beyond this point.  Press 
> lowre Function to return panel to normal operation.
> 
> DAC null:  using 3.5 or 4 digit DMM to measure between TP1 and TP2 
> adjust R46 until the meter reads within 100uV of 0 (-.0001 to 
> +.0001V).  This is a critical adjustment and quite sensitive.
> 
> lever position:  measure the DC voltage between the center terminal 
> and ground of each pot in the lever assembly.  At rest should be 2-
> 3V.  IF either is out of range use 1/2 inch wrench to loosen the nut 
> on the pot, rotate the pot until the voltage reads 2.5V and retighten.
> 
> skipping so stuff...
> 
> Lever range:
> LF - A - 7 and move levers (pb/mod) through the entire mechanical 
> range.  The computer will adjust to the measured range.
> 
> Pedal range:
> LF - A - 8 as above but move pedal 
> 
> volume offset:  to long to type
> 
> key sensitivity: LF - A -10.  Use a touch sensitive patch.  If a key 
> feels over or under senstive, press a key and use master slider to 
> adjust sensitivity.
> 
> final stuff for Bryon to debug ADC:
> check out ADC voltage (R45 adjustment above).  
> Output of sliders are selected for ADC by MUX Z5 (on control panel).  
> 1/2 of Z54 buffers the mux output which is fed into Z53 (ADC0804 ADC) 
> the othe r1/2 of Z54 buffers the ADC reference voltage (R45).
> Make sure all these chips are well seated.
> 
> You can also use MIDI controls if all else fails or to verify that it 
> isn't a voice problem... but that will have to wait (I guess you 
> could check the range of the midi out signals using a PC and a midi 
> monitor program).
> 
> Good luck,
> Ben
> 
> 
> 
> 
> 
> 
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