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SPHINX

Project Eight Service Manual

SERVICE MANUAL

PROJECT EIGHT

REFERENCE

PRE-AMP

Summary of Contents for Project Eight

Page 1: ...SPHINX Project Eight Service Manual 1 A SERVICE MANUAL PROJECT EIGHT REFERENCE PRE AMP A ...

Page 2: ...TPUT DC OFFSET ADJUSTMENT 10 Set up 10 Adjustment 10 9 PROBLEMS AND SOLUTIONS 11 10 DIAGRAMS AND PARTS LISTS 12 Figure 1 Front panel 12 Figure 2 Rear panel 12 Index of diagrams and drawings 13 Figure 3 Connection Diagram for testing the Project Eight 14 Figure 4 Display Board Schematic Layout 15 Figure 5 Construction Drawing for top cover plate 16 Figure 6 Schematic Operational Diagram Project Eig...

Page 3: ...rior quality inspection This ensures the user many years of high quality audio from a perfect looking product We recommend owners to ship the Project Eight in its original carton After unpacking the Project Eight we therefore recommend you carefully check it for any transport damage If you find any damage and the product has not been shipped in the original carton the ensuring repair costs will no...

Page 4: ...01 impedance 10 ohm Volume control Relay controlled in steps of 0 2 dB Range 100 dB channel imbalance less than 0 2 dB Sphinx Control 3x optical OUT 1 1 second delayed OUT 2 normal OUT 3 programmable via Auto On Remote control full function Mechanical decoupling of housings Transrotor absorbing pucks Power supply External in completely separate housing Supply capacitance 148 000 µF total Power con...

Page 5: ...ation as supplied with every Project Eight q Switch off the mains power q Press the Standby button q Switch the mains on again while holding the Standby button depressed q The display will now show the serial number or software version Input functions All inputs should be checked for the correct q Name q Boost Attenuation setting q Polarity Channel imbalance For every position step of the volume c...

Page 6: ...nput 1 to 8 Note 9 and 0 have no function 5 POLARITY To change the polarity of the selected input from to as indicated in the display 6 SET UP To activate the SET UP mode pressing this button has the same effect as pressing the PRESETS button on the front panel 7 PROGRAM After activating the SET UP mode you can change the parameters with these two buttons they have the same effect as the INPUT con...

Page 7: ...is in direct sunlight or under strong lighting conditions 2 Simultaneously press the and TV buttons on the Sphinx Remote The orange LED at the top right hand of the Remote will light 3 Momentarily press the first button on the Sphinx Remote to be programmed The orange LED blinks 4 Then keep the appropriate button on the other remote depressed until the LED becomes green After releasing the button ...

Page 8: ...program any function for any button You are therefore able to custom configure the Remote Control and use it for several pieces of equipment The memory holds a maximum of 120 commands Warning If you don t know exactly what you are doing please consult your Sphinx dealer Encountering problems Remote Control does not work Wrong component selected Select the correct one Wrong Remote mode Learn instea...

Page 9: ...balanced cable set to connect distortion meter pre amp and power amp q 1x special top cover plate preferably transparent with holes for adjustment tools Note See drawing 5 for construction details q A two channel DC coupled power amplifier e g Project Eighteen Audio signal distortion measurement Before adjusting the Project Eight please first measure the total harmonic distortion at the audio outp...

Page 10: ... disamps have no effect on an unbalanced signal q Turn the volume of the project eight to off The offset currently visible on the mV meter is the offset of disamp A3 left channel and or disamp B3 right channel q This offset can be adjusted by potentiometer P1 P2 of disamp A3 for the left channel and by potmeter P1 P2 of disamp B3 for the right channel q Turn the volume of the project eight fully o...

Page 11: ...nfo in this table This table can then be used for future reference Please also send by fax or e mail the specific information to the Sphinx International Service Department see page 3 this info can then be added to the general database to aid others Problem Cause Solution Refer to page Volume control doesn t work properly IC U15 U16 U17 or U18 may be defective Replace the defective one Page 24 Pag...

Page 12: ...e Manual 12 10 DIAGRAMS AND PARTS LISTS The next pages contain the front and rear panel lay out and a complete set of schematic drawings including the associated parts lists if applicable Figure 1 Front panel Figure 2 Rear panel ...

Page 13: ...ion Drawing for top cover plate 17 Schematic Operational Diagram Project Eight 18 Schematic Overview of all relevant potentiometers 19 Disamp 96 20 Functional Schematic 21 Left Power Supply 22 Right Power Supply 23 Input Output 24 Left Volume Control 25 Right Volume Control 26 Left Output Amp 27 Right Output Amp 28 Left Input Amp 29 Right Input Amp 30 Power Supply Unit 31 PCB drawings ...

Page 14: ...tion Diagram for testing the Project Eight Right Left Amplfier 30x A B AMPLIFIER out1 out2 inp2 inp1 gnd THD Amplitude Frequency Oscillator THDout Right Left Pre amplfier 3x A B PRE AMPLIFIER out1 out2 inp2 inp1 Scoop SWITCH BOX x y inp2 time div inp1 gnd ...

Page 15: ...H8 325 VOUT 1 PFI 4 PFO 5 WDI 6 RES 7 VBAT 8 U2 MAX690 U3 8M VCC VCC R1 27K4 R2 10K0 VCC C1 33p C2 33p A B S1 ENCOD A B S2 ENCOD 2 1 S3 2 1 S4 2 1 S5 VCC C3 220n V 2 D 1 GND 3 IR IR1 IRIC R3 5R62 R4 61K9 Input Volume Standby Presets Polarity 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 CN1 18PIN D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D 0 7 S0 S1 S2 S3 S4 S5 S6 S0 S1 S2 S3 S4 S5 S 0 5 VCC ...

Page 16: ...ual 16 Figure 5 Construction Drawing for top cover plate All sizes in millimeters 480 315 34 33 66 48 48 48 48 12 216 230 Top View Front Back For holes use drill size of approx Ø 6 mm 6 6 Holes use same spacing as the ones shown below ...

Page 17: ...6 Schematic Operational Diagram Project Eight module 5 module 7 module 8 module 1 module 2 module 3 module 4 front top view project eight main board left right disamp disamp module 6 disamp disamp disamp disamp disamp disamp A4 A2 A1 A3 B4 B2 B1 B3 ...

Page 18: ...chematic Overview of all relevant potentiometers A3 A1 A4 A2 B3 B1 B4 B2 LEFT RIGHT DISAMP DISAMP DISAMP DISAMP DISAMP DISAMP DISAMP DISAMP VCC VCC VCC VCC VCC VCC VCC VCC VDD VDD VDD VDD VDD VDD VDD VDD P1 P1 P1 P1 P1 P2 P1 P2 P2 P1 P2 P1 P2 P2 P2 P2 ...

Page 19: ... 600R R22 51R0 R12 600R T6 C2705 D2 1N4148 D3 1N4148 R13 18R0 R14 18R0 R10 4K75 C3 470pF AGND AGND R15 10R0 C4 47pF R4 10R0 R6 10R0 R2 243R R8 243R R9 100R R1 100R R3 51R0 R7 51R0 R5 24R9 P1 50R T1 A1306 T2 C3298 LD2 C1 47n C2 47n 1 4 CN2 4PIN 1 4 CN3 4PIN 1 4 CN1 4PIN 1 2 3 4 5 6 7 8 CN4 8PIN C5 10n C6 10n AGND T4 C2705 T5 A1145 D4 1N4148 D1 1N4148 T3 A1145 P2 50R LD4 4mA 4mA 24V 1V 24V 1V LED Vo...

Page 20: ... P08RVC SCH RV OUT RV OUT RV IN RV IN D 1 16 L 24V L 24V LV OUT LV OUT L OUT L OUT LEFT DIFF LINE AMP P08LOA SCH L 24V L 24V LV OUT LV OUT L OUT L OUT R 24V R 24V RV OUT RV OUT R OUT R OUT RIGHT DIFF LINE AMP P08ROA SCH R 24V R 24V RV OUT RV OUT R OUT R OUT L 24V L 24V LV IN LV IN L IN L IN CINCH LEFT DIFF LINE AMP P08LIA SCH L 24V L 24V LV IN LV IN L IN L IN CINCH RV IN RV IN R IN R IN R 24V R 24...

Page 21: ...330U C35 50V 330U C36 50V 330U C27 50V 330U R33 3K32 R37 8K25 R46 1K00 R45 10K0 R47 1K00 R34 3K32 R38 8K25 R48 10K0 3 2 6 7 4 U3 OPA604 R30 2K00 R21 10K0 R17 10K0 D10 1N4148 L 24V L 24V AGND C34 22N PP C25 22N PP C28 22N PP C37 22N PP C1 330N PP C6 330N PP C13 C50V 330U C16 C50V 330U C21 330N PP C22 330N PP C33 63V 2200U C38 63V 2200U R41 1R00 R42 1R00 C2 63V 1000U C3 63V 1000U C5 63V 1000U C4 63V...

Page 22: ...7 1N4004 R24 2K00 U8 LM329DZ U9 LM329DZ C30 50V 330U C41 50V 330U C42 50V 330U C31 C50V 330U R35 3K32 R39 8K25 R50 1K00 R49 10K0 R51 1K00 R36 3K32 R40 8K25 R52 10K0 3 2 6 7 4 U5 OPA604 R31 2K00 R27 10K0 R23 10K0 D12 1N4148 D8 1N4004 R 24V R 24V AGND AGND C40 22N PP C29 22N PP C32 22N PP C43 22N PP C7 330N PP C12 330N PP C17 50V 330U C20 50V 330U C23 330N PP C24 330N PP C39 63V 2200U C44 C63V 2200U...

Page 23: ... U14 UCN5801 CLEAR 1 STRB 2 IN1 3 IN2 4 IN3 5 IN4 6 IN5 7 IN6 8 IN7 9 IN8 10 GND 11 COMMON 12 OUT8 13 OUT7 14 OUT6 15 OUT5 16 OUT4 17 OUT3 18 OUT2 19 OUT1 20 Vdd 21 OUT EN 22 U21 UCN5801 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 U19 18PIN D1 D2 D3 D4 D5 D6 D7 D8 D1 D2 D3 D4 D5 D6 D7 D8 D1 D2 D3 D4 D5 D6 D7 D8 DGND DGND 24V 24V 5V 5V 24V Vin 1 GND 2 5V 3 U20 MC7805T C74 50V 330U 5V DGND DGND 5V ...

Page 24: ...5 7 IN6 8 IN7 9 IN8 10 GND 11 COMMON 12 OUT8 13 OUT7 14 OUT6 15 OUT5 16 OUT4 17 OUT3 18 OUT2 19 OUT1 20 Vdd 21 OUT EN 22 U15 UCN5801 CLEAR 1 STRB 2 IN1 3 IN2 4 IN3 5 IN4 6 IN5 7 IN6 8 IN7 9 IN8 10 GND 11 COMMON 12 OUT8 13 OUT7 14 OUT6 15 OUT5 16 OUT4 17 OUT3 18 OUT2 19 OUT1 20 Vdd 21 OUT EN 22 U16 UCN5801 R142 2K00 R144 2K00 LV IN LV IN LV OUT LV OUT 5V 5V 24V 24V DGND DGND D 1 16 24V DGND DGND D1...

Page 25: ...5 7 IN6 8 IN7 9 IN8 10 GND 11 COMMON 12 OUT8 13 OUT7 14 OUT6 15 OUT5 16 OUT4 17 OUT3 18 OUT2 19 OUT1 20 Vdd 21 OUT EN 22 U17 UCN5801 CLEAR 1 STRB 2 IN1 3 IN2 4 IN3 5 IN4 6 IN5 7 IN6 8 IN7 9 IN8 10 GND 11 COMMON 12 OUT8 13 OUT7 14 OUT6 15 OUT5 16 OUT4 17 OUT3 18 OUT2 19 OUT1 20 Vdd 21 OUT EN 22 U18 UCN5801 R146 2K00 R148 2K00 RV IN RV IN RV OUT RV OUT 5V 5V 24V 24V DGND DGND D 1 16 24V DGND DGND D1...

Page 26: ...3 V V OUT NFB U11 DISAMPMODULE AGND C52 C63V 2200U C49 C63V 2200U C48 C63V 2200U C45 C63V 2200U AGND AGND AGND AGND R54 1R00 R55 1R00 R56 1R00 R57 1R00 L 24V L 24V L 24V L 24V L OUT L OUT R64 10K0 1 R63 10K0 1 R67 10K0 1 R70 100K R71 100K AGND AGND R74 2x0 3 zilver R75 2x0 3 zilver LV OUT LV OUT AGND C46 47N PP C47 47N PP C50 47N PP C51 47N PP 37 40mA 37 40mA 37 40mA 37 40mA C61 220p C62 220p ...

Page 27: ...13 V V OUT NFB U13 DISAMPMODULE AGND C59 C63V 2200U C60 C63V 2200U C56 C63V 2200U C53 C63V 2200U AGND AGND AGND AGND R58 1R00 R59 1R00 R60 1R00 R61 1R00 R 24V R 24V R 24V R 24V R OUT R OUT R66 10K0 1 R65 10K0 1 R68 10K0 1 R72 100K R73 100K AGND AGND R76 2x0 3 zilver R77 2x0 3 zilver RV OUT RV OUT AGND C54 47N PP C55 47N PP C57 47N PP C58 47N PP 37 40mA 37 40mA 37 40mA 37 40mA C63 220p C64 220p ...

Page 28: ... DISAMPMODULE AGND C113 C63V 2200U C110 C63V 2200U C109 C63V 2200U C106 C63V 2200U AGND AGND AGND AGND R150 1R00 R151 1R00 R152 1R00 R153 1R00 L 24V L 24V L 24V L 24V LV IN LV IN R160 20K0 1 R158 10K0 1 R159 10K0 1 R166 50K0 R167 50K0 C122 220p C123 220p AGND AGND R170 1K00 R171 1K00 L IN L IN R161 20K0 1 RL59 REL16 24V CINCH AGND C107 47N PP C108 47N PP C111 47N PP C112 47N PP 37 40mA 37 40mA 37 ...

Page 29: ... DISAMPMODULE AGND C121 C63V 2200U C118 C63V 2200U C117 C63V 2200U C114 C63V 2200U AGND AGND AGND AGND R154 1R00 R155 1R00 R156 1R00 R157 1R00 R 24V R 24V R 24V R 24V RV IN RV IN R164 20K0 1 R162 10K0 1 R163 10K0 1 R168 50K0 R169 50K0 C124 220p C125 220p AGND AGND R172 1K00 R173 1K00 R IN R IN R165 20K0 1 RL60 REL16 24V CINCH AGND C115 47N PP C116 47N PP C119 47N PP C120 47N PP 37 40mA 37 40mA 37 ...

Page 30: ...GE6 B6 BRIDGE6 R15 1R R16 1R R22 1R R23 1R R30 1R C28 C63V 2200U C17 C50V 6800U C23 C50V 6800U C24 C50V 6800U C18 C50V 6800U R17 1R R18 1R R19 1R R20 1R R24 1R R25 1R R26 1R R27 1R Vout Vin GND U2 7809 C29 9V 24V DGND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 CN1 16PIN 9V 24V DGND C27 C50V 330U C30 C50V 330U R21 10K0 R28 10K0 R14 10K0 R7 10K0 R32 1R 14V 14V 14V 14V 120V 120V T1 R CORE 50VA 14V 14V 14...

Page 31: ...he PCB drawings are located in separate files These files are in PDF format Adobé Acrobat 3 0 Reader Project 8 mainboard A3 format PJ 8A3mainboard pdf Project 8 mainboard A4 format PJ 8A4mainboard pdf Project 8 Disamp Module A4 format Pj 8disamp pdf Project 8 Display Module A4 format Pj 8display pdf Project 8 Power Supply A4 format Pj 8powersupply pdf ...

Page 32: ...11 C50V 6800U Capacitor C11 C63V 1000U Capacitor C110 C63V 2200U Capacitor C111 47N PP Capacitor C112 47N PP Capacitor C113 C63V 2200U Capacitor C114 C63V 2200U Capacitor C115 47N PP Capacitor C116 47N PP Capacitor C117 C63V 2200U Capacitor C118 C63V 2200U Capacitor C119 47N PP Capacitor C12 330N PP Capacitor C12 C25V 47U Capacitor C12 C50V 6800U Capacitor C120 47N PP Capacitor C121 C63V 2200U Cap...

Page 33: ...2 22N PP Capacitor C33 C63V 2200U Capacitor C34 22N PP Capacitor C35 C50V 330U Capacitor C36 C50V 330U Capacitor C37 22N PP Capacitor C38 C63V 2200U Capacitor C39 C63V 2200U Capacitor C4 100NMKT Capacitor C4 220n Capacitor C4 47pF Capacitor C4 C63V 1000U Capacitor C40 22N PP Capacitor C41 C50V 330U Capacitor C42 C50V 330U Capacitor C43 22N PP Capacitor C44 C63V 2200U Capacitor C45 C63V 2200U Capac...

Page 34: ...00NMKT Capacitor C81 100NMKT Capacitor C82 100NMKT Capacitor C83 100NMKT Capacitor C84 100NMKT Capacitor C85 100NMKT Capacitor C86 100NMKT Capacitor C87 100NMKT Capacitor C88 100NMKT Capacitor C89 100NMKT Capacitor C9 100NMKT Capacitor C9 470U 16V Capacitor C9 C25V 47U Capacitor C9 C63V 1000U Capacitor C90 100NMKT Capacitor C91 100NMKT Capacitor C92 100NMKT Capacitor C93 C50V 330U Capacitor C94 10...

Page 35: ...N4004 Diode D1 1N4148 Diode D1 1N4148 Diode D10 1N4148 Diode D11 1N4148 Diode D12 1N4148 Diode D2 1N4004 Diode D2 1N4148 Diode D3 1N4004 Diode D3 1N4148 Diode D4 1N4004 Diode D4 1N4148 Diode D5 1N4004 Diode D6 1N4004 Diode D7 1N4004 Diode D8 1N4004 Diode D9 1N4148 Diode IR1 IRIC Infrared receiver J1 Jumper R Jumper J2 Jumper R Jumper J3 Jumper R Jumper LD1 LD RD LED LD1 LD RD LED LD2 LD RD LED LD2...

Page 36: ...10R0 Resistor R12 15R0 Resistor R12 1R Resistor R12 600R Resistor R120 2K61 Resistor R121 10R0 Resistor R122 2K61 Resistor R123 10R0 Resistor R124 2K61 Resistor R125 10R0 Resistor R126 1K30 Resistor R127 0R00 Resistor R128 1K30 Resistor R129 0R00 Resistor R13 18R0 Resistor R13 1R Resistor R13 1R00 Resistor R130 1K30 Resistor R131 0R00 Resistor R132 1K30 Resistor R133 0R00 Resistor R134 649R Resist...

Page 37: ...esistor R17 51R0 Resistor R170 1K00 Resistor R171 1K00 Resistor R172 1K00 Resistor R173 1K00 Resistor R174 10R0 Resistor R175 33K2 Resistor R176 33K2 Resistor R18 1R Resistor R18 2K00 Resistor R18 2K21 Resistor R19 1R Resistor R19 2K00 Resistor R19 2K21 Resistor R2 10K0 Resistor R2 1R Resistor R2 243R Resistor R2 4k75 Resistor R20 1R Resistor R20 2K00 Resistor R20 2K21 Resistor R21 10K0 Resistor R...

Page 38: ...8 8K25 Resistor R39 8K25 Resistor R4 10R0 Resistor R4 1R Resistor R4 22K1 Resistor R4 61K9 Resistor R40 8K25 Resistor R41 1R00 Resistor R42 1R00 Resistor R43 1R00 Resistor R44 1R00 Resistor R45 10K0 Resistor R46 1K00 Resistor R47 1K00 Resistor R48 10K0 Resistor R49 10K0 Resistor R5 1R Resistor R5 22K1 Resistor R5 24R9 Resistor R5 68K1 Resistor R50 1K00 Resistor R51 1K00 Resistor R52 10K0 Resistor ...

Page 39: ...istor R9 100R Resistor R9 1R Resistor R9 1R00 Resistor R90 39K2 Resistor R91 162R Resistor R92 39K2 Resistor R93 162R Resistor R94 20K0 Resistor R95 80R6 Resistor R96 20K0 Resistor R97 80R6 Resistor R98 20K0 Resistor R99 80R6 Resistor RL1 REL16 Relay 24V RL10 REL16 Relay 24V RL11 REL16 Relay 24V RL12 REL16 Relay 24V RL13 REL16 Relay 24V RL14 REL16 Relay 24V RL15 REL16 Relay 24V RL16 REL16 Relay 24...

Page 40: ...EL16 Relay 24V RL57 REL16 Relay 24V RL58 REL16 Relay 24V RL59 REL16 Relay 24V RL6 REL16 Relay 24V RL60 REL16 Relay 24V RL7 REL16 Relay 24V RL8 REL16 Relay 24V RL9 REL16 Relay 24V S1 ENCOD Encoder S2 ENCOD Encoder S3 DRUK TOETS Switch S4 DRUK TOETS Switch S5 DRUK TOETS Switch SP1 SILPAD Soldering pad SP10 SILPAD Soldering pad SP11 SILPAD Soldering pad SP12 SILPAD Soldering pad SP13 SILPAD Soldering...

Page 41: ... Transistor T14 C2240 Transistor T15 A970 Transistor T16 C2240 Transistor U1 7824 Stab IC U2 7809 Stab IC U20 MC7805T Stab IC U1 16PIN Connector U1 H8 325 Microprocessor U10 DISAMPMODULE DISCRETE OPAMP MODULE U11 DISAMPMODULE DISCRETE OPAMP MODULE U12 DISAMPMODULE DISCRETE OPAMP MODULE U13 DISAMPMODULE DISCRETE OPAMP MODULE U14 UCN5801 Driver IC U15 UCN5801 Driver IC U16 UCN5801 Driver IC U17 UCN5...

Page 42: ...SPHINX Project Eight Service Manual 42 Designator Part Type Description U7 LM329DZ ZENER Diode U8 LM329DZ ZENER Diode U9 LM329DZ ZENER Diode 1998 Audioscript BV Version May 13 1998 ...

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