ARP Odyssey I 2800 Service Manual Download Page 3 | Manualshive

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Summary of Contents for Odyssey I 2800

Page 1: ...MODELS 2800 THROUGH 2823...

Page 2: ...cosmetic and electrical changes since its original production in 1972 however the functional capabilities have remained virtually unchanged The following are the most noticeable physical differences a...

Page 3: ...ollowing modification see Field Change Notice 007 The earlier model Odyssey lls used a 4035 voltage controlled filter which has since then been replaced by the 4075 No modifications are necessary when...

Page 4: ...te VCO 1 is a low note priority VCO 2 is high note priority Transpose Positions Down 2 octaves normal up 2 octaves Pitch Bend Frequency shift About 1 oct exactly 1 octave on Odyssey 2 PPC Frequency sh...

Page 5: ...4...

Page 6: ...Model 2800 Odyssey 1 2 Interconnect Diagram 5...

Page 7: ...del 2820 2823 Interconnect Diagram 6...

Page 8: ...ough CR2 and R21 which reverse biases CR3 and allows Q7 to conduct The control voltage from A1A is then allowed to charge the memory capacitor C8 When a key is released Q7 turns off to prevent C8 from...

Page 9: ...e a linear voltage to exponential current generator for every volt applied from the keyboard the current through Q5 will double Cl 2 is the integrating capacitor it is initially charged to 15 volts an...

Page 10: ...Q5 P6 Release slider sets the release time Q6 and Q7 buffer the voltage on C7 and supply it to the VCA and VCF 2 3 4 ADSR Envelope Generator The Attack Decay Sustain Release envelope generator produc...

Page 11: ...CR4 create a dead zone when the control is centered and R27 calibrates the output to exactly plus and minus a volt 2 4 4 PPC The PPC circuit contains three resistive carbon strips three conductive rub...

Page 12: ...nd the cycle repeats An LFO reset pulse is supplied from Q4 every time a key is depressed Q5 is turned on momentarily by the LFO reset pulse and discharges the integrating capacitor C7 thus reinitiali...

Page 13: ...ltage Release When the gate is removed the remaining voltage on C8 is discharged to ground through CR10 R44 and the release slider R88 is connected through pin 5 to the noninverting input of an op amp...

Page 14: ...ltage Release When the gate is removed the remaining voltage on C8 is discharged to ground through CR10 R44 and the release slider R88 is connected through pin 5 to the noninverting input of an op amp...

Page 15: ...0 Put the TRANSPOSE trimmer in the UP 2 OCTAVES position 1 1 Adjust the UP 2 OCT trimmer on Board A T4 for exactly 4 volts higher than step 4 T2 2ND VOICE 12 Put the TRANSPOSE switch in the NORMAL pos...

Page 16: ...O 2 is exactly in tune with VCO 1 15 Pin high C on the keyboard 16 Using the VCO 2 V OCT trimmer on Board B adjust the frequency of VCO 2 until it is exactly the same as VCO 1 17 Repeat steps 12 throu...

Page 17: ...ard 4 Monitor the HIGH OUTPUT of the Odyssey with a frequency counter 5 Adjust the VCF FREQUENCY slider for 100 Hz 6 Pin high C on the keyboard 7 Adjust the VCF V OCT trimmer on Board C for 800 Hz 8 R...

Page 18: ...dure 2 Perform the V OCT section of the Board B l or B ll trim procedure 3 Put the following sliders at MAXIMUM VCO 1 square wave to the AUDIO MIXER VCF FREQUENCY and VCA GAIN 4 Put all other sliders...

Page 19: ...n the front panel DOWN 3 Pin low C on the keyboard 4 Monitor the HIGH OUTPUT of the Odyssey with a frequency counter 5 Adjust the VCF FREQUENCY slider for 100 Hz 6 Pin high C on the keyboard 7 Adjust...

Page 20: ...e switch in the normal position 2V 2 Depress and hold high C 5V TP 4 CV OUTPUT 1 Depress and release low C transpose switch in the normal position 2V Should not change more than 20 millivolts in one m...

Page 21: ...CO 1 2 1 Initial frequency sliders midposition 2 All other sliders down TP 5 SQUARE WAVE OUTPUT VCO 1 2 1 Initial frequency sliders midposition 2 All other sliders down TP 6 SAWTOOTH OUTPUT VCO 1 2 1...

Page 22: ...Raise the VCF VCO 1 Sawtooth slider VCA OUTPUT 2 2 Raise the initial filter frequency slider 3 Raise the VCA gain slider 4 Put all other sliders down 2V 2 V 1 All repeat slide switches under the ADSR...

Page 23: ...ute 2 Depress and release high C OV should not change more than 20 millivolts in one minute TP 4 CV OUTPUT 1 Transpose and Pitch Bend Normal 2 Depress and release low C OV 3 Depress and release high C...

Page 24: ...her sliders down SQUARE WAVE OUTPUT VCO 1 2 1 Initial frequency sliders midposition SAWTOOTH OUTPUT VCO 1 2 1 Initial frequency sliders midposition 2 All other sliders down LFO TRIANGLE OUTPUT 1 LFO f...

Page 25: ...Raise the VCF VCO 1 Sawtooth TP 3 VCA OUTPUT 2 3 4 slider Raise the initial filter frequency slider Raise the VCA gain slider Put all other sliders down 1 All repeat slide switches under the ADSR UP...

Page 26: ...Odyssey 2 the tuning procedures are different for the two instruments Perform the trim procedures in the order listed below when retuning TO RETUNE AN OD YSSEY 1 A Follow the trim procedure for the PW...

Page 27: ...ARP ODYSSEY Model 2800 SCHEMATIC Board A 1...

Page 28: ...27 ARP ODYSSEY Model 2800 ASSEMBLY Board A 1...

Page 29: ...UJ CC O 2 1 cr UJ r o S o o o HI I 1 o 0 UJ O a UJ C9 CD cr o Ss 5q S 5 g r i O to id 9l 5 IN S O o o o 5 O cij 5 10 0 ZO l N O W Mte 9 MOI it loo J t 1 m tr W 4 8 3 X u U l U jj e t 2 c J K tP n v C...

Page 30: ...ARP ODYSSEY 2 Model 2810 2823 ASSEMBLY Board A ll without PPC ARP ODYSSEY 2 Model 2810 2823 ASSEMBLY Board A ll with PPC 29...

Page 31: ...55 Pw H OOK i N PW D RLi A V I 2M 468 AV 330 K ffiot n 443 Itk 6 SOM Zlb VCh AcY SfcOlc 4 oJ IOOK S0 P vco 1 S 8 4 07 A W f 8 K p 3 5 IOOK i w X PW KttP IT A 21 IOOKV4 LfM S pw a 4 J AAV 330K 43 AAV...

Page 32: ...ARP ODYSSEY Model 2800 ASSEMBLY Board B l 31...

Page 33: ...32...

Page 34: ...33...

Page 35: ...34...

Page 36: ...ARP ODYSSEY Model 2800 ASSEMBLY Board C 1...

Page 37: ...36...

Page 38: ...u ARP ODYSSEY 2 Model 2810 2823 ASSEMBLY Board C ll...

Page 39: ...38 YSSEY Model 2800 TIC Power Supply 1...

Page 40: ...c V OLtT Krn 0 6 39...

Page 41: ...Q o cn CD 5 o Q g8 cc o S LU C...

Page 42: ...Q o cn CD 5 o Q g8 cc o S LU C...

Page 43: ...1701 2N5172 TRANSISTOR NPN Q7 14 1302801 2N6076 TRANSISTOR PNP Q4 5 Q1 1 12 7502600 APL4027 008 TRANSISTOR ASSY NPN PNP Q2 8 15 1302501 2N5461 FET P CHANNEL Q3 5600201 A2803 003 1B FET N CHANNEL MOT 2...

Page 44: ...ON J FET Q3 1301301 LS4392 TRANSISTOR N CHANNEL FET Q7 1301701 2N5172 TRANSISTOR NPN Q5 5600101 A8000 01 2 TR ANSISTO R NOISE SEL 2N51 72 Z2 4 5601801 A2 80 1 00 8 S LI 9988 AMPLIFIER OPL TESTED LM145...

Page 45: ...ART NUMBER ARP MFG NUMBER DESCRIPTION Ml 7210500 APL4075 005 PC BD ASSY VCF 4075 MODULE C R 1 22 1200301 IN4148 DIODE SI LI CON SIGNAL 02 3 4 6 8 10 13 16 18 1301701 2N5172 TRANSISTOR NPN 01 5 7 9 11...

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