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Project Two MKII

SPHINX Project Two MKII Service Manual

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SERVICE MANUAL
PROJECT TWO Mk2
PRE-AMP
SPHINX Project Two Mk2 Service Manual
2
1. UNPACKING.......................................................................................................................................3
2. SPHINX WARRANTY CARD..............................................................................................................3
3. CONTACTING THE MANUFACTURER.............................................................................................3
4. THE PRE-AMP AT A GLANCE ..........................................................................................................4
5. OPERATION .......................................................................................................................................6
6. SPHINX REMOTE CONTROL............................................................................................................7
7. TECHNICAL SPECIFICATIONS.........................................................................................................9
8. ADJUSTMENT PROCEDURES........................................................................................................10
9. PROBLEMS AND SOLUTIONS .......................................................................................................11
10. DIAGRAMS AND PARTS LISTS ....................................................................................................12
SPHINX Project Two Mk2 Service Manual
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The Sphinx Project Two Mk2 design principles
The Sphinx Project Two Mk2 was designed for the ever-increasing group of quality-conscious audiophiles. We are very proud of the tradition connected with the SPHINX name, especially concerning audio quality perfection.
This service manual will help you to optimally service and repair the Sphinx Project Two Mk2 Pre­Amp. This pre-amp is extremely simple to operate and uses the newest technologies and refined designs. Designs that have successfully been used in the award winning Project Eight. Features include ultra-linear extremely low-noise Class A audio circuits, built from the finest hand­selected parts. The signal path is completely balanced from input to output, and left and right are totally separated. The power supply is of a unique design (fully Class­A!) and consists of three completely separate and independent sections: one for the digital control plus one each for the left and right channel. The ALPS volume control is motor-controlled. All settings and controls can also be accessed from the supplied Sphinx Remote Control.
To obtain the maximum quality from this pre amp it is necessary for it to be properly aligned and to be used with top quality audio components, preferably other Sphinx components.
1. UNPACKING
Before leaving the factory every Project Two Mk2 is subjected to stringent and extensive technical and exterior quality inspection. This ensures the user many years of high quality audio from a perfect­looking product. We recommend owners to ship the Project Two Mk2 in its original carton.
After unpacking the Project Two Mk2 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 not be covered by the warranty.
2. SPHINX WARRANTY CARD
To be entitled to any warranty repairs the owner must have send the filled out warranty card to Sphinx or a distributor where it has been registered. Other regulations may apply in your specific country: when in doubt, please consult the proper authorities.
3. CONTACTING THE MANUFACTURER
In case of any problem not covered in this manual or if you have other questions you may contact the Sphinx International Service Department in The Netherlands (local time: GMT +1h) during office hours at the following numbers:
Telephone (+31) 35 602 0302 Fax (+31) 35 602 2806 E-mail audionl@euronet.nl
It is always very helpful and efficient if you have all relevant information about the specific product and the problem ready.
Please also refer to the User Manual of the Project Two Mk2 for information about functions not described in this manual. It is important to familiarise yourself with the special functions, operation and possibilities of the Sphinx Project Two Mk2.
SPHINX Project Two Mk2 Service Manual
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4. THE PRE-AMP AT A GLANCE
Front panel
1
1. INPUT: With this rotary knob you may select one of the six inputs. Turn clockwise for an input to the right of the active one, anti-clockwise for an input to the left.
2. STANDBY: To switch the component on and off: on LED is green off LED is red
3. Receptor window for the IR signals from the Remote Control.
4. Input selection LED's: The input selected with knob (1.) is indicated by one of these LED's: CD SYM balanced CD input CD unbalanced CD input TUNER unbalanced Tuner input LINE 1 unbalanced line input 1 LINE 2 unbalanced line input 2 LINE 3 unbalanced line input 3.
5. MUTE: Press this button to temporarily mute the sound. The red LED will light.
6. TAPE MON: To select the TAPE IN input. The red LED will light.
7. PHONES: To connect dynamic stereo headphones.
8. VOLUME: This rotary knob adjusts the volume level.
1 2
3 5
4 6 7 8
SPHINX Project Two Mk2 Service Manual
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Rear panel
9. GROUND: You may directly connect the signal grounds of other equipment to the signal ground of the Project Two Mk2.
10. TAPE OUT: Connect this output to the input of the recorder.
11. TAPE IN: Connect this input to the output of the recorder.
12. CD: To connect the cinch signal cable from the CD player.
13. TUNER: To connect the cinch signal cable from the tuner.
14. LINE 1: To connect the cinch signal cable from the signal source for LINE 1.
15. LINE 2: To connect the cinch signal cable from the signal source for LINE 2.
16. LINE 3: To connect the cinch signal cable from the signal source for LINE 3.
17. CD BALANCED L: To connect the XLR signal cable (balanced cable) from the left output of the CD player.
18. CD BALANCED R: To connect the XLR signal cable (balanced cable) from the right output of the CD player.
19. BALANCED OUT L: To connect the XLR signal cable (balanced cable) from the left input of the power amp.
20. BALANCED OUT R: To connect the XLR signal cable (balanced cable) from the right input of the power amp.
21. OUT 1 L+R: Connect this output with a cinch signal cable to the input of your power amp.
22. OUT 2 L+R: To connect the XLR signal cable (balanced cable) from the right input of the extra power amp or surround processor.
23. Control Out: To connect the optical cable going to another Sphinx component.
24. Warning!: This shows important information about the safety regulations for the Project Two Mk2.
25. AC Power: Connect the mains cable to a mains power outlet (230 - 240 VAC).
26. O / I: This is the mains power switch.
27. Fuse holder: Contains a fuse (500 mA slow).
28. Selector for power supply voltage (120/240 V), (115/230 V).
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
25
26
27 28
SPHINX Project Two Mk2 Service Manual
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5. OPERATION
Connect the mains cable to a mains outlet. Once you have finished connecting all components, you can power on the Project Two Mk2 with the mains switch O / I (26.).
The volume control will then automatically turn counter-clockwise and, for a while, the STANDBY LED will blink red/green, after which it will remain red. The pre-amp is now in standby mode.
Power on
You switch the amp on with the STANDBY button. That way, all circuits will remain at optimum operating temperatures and the audio quality will be 100% immediately after switching on. Additionally it significantly increases the life span of the component.
The pre-amp will select the CD SYM input after which it un-mutes the output.
Selecting an input
You select the input with the large rotary knob INPUT: clockwise to the right of the selected one, anti-clockwise to the left of the selected one. Upon reaching LINE 3 or CD SYM you cannot 'roll over' to CD SYM or LINE 3 respectively.
As long as you move the knob, only the LED's will change: the current selected input remains active. The new input only becomes active after you have selected it and released the INPUT knob. You will hear a 'click'. This is caused by the precision relays for the inputs: the 'old' one is released while the new one is energised.
Adjusting the volume level
The large VOLUME control to the right adjusts the volume level from OFF to maximum (fully clockwise). The level change is immediate.
Memory mode
The Project Two Mk2 has a MEMORY mode: it automatically selects the last input that was active before you switched the component off with the stand-by button.
Power off
You switch the Project Two Mk2 off (to stand-by) with the STANDBY button (2.).
SPHINX Project Two Mk2 Service Manual
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6. SPHINX REMOTE CONTROL
This single Sphinx Remote Control lets you control all functions: not only of the Project Two Mk2, but also of all other Sphinx equipment.
Only the following buttons and indications on the Remote apply to the Project Two Mk2 (the others will not function):
Buttons and LED indication
1. PRE-AMP: To select the pre-amp. All buttons pressed hereafter will control only the pre-amp functions. Note: TUNER and CD have no function.
2. STANDBY: Use this button to switch the Project Two Mk2 to stand-by.
3. : Pressing this button mutes the outputs (temporarily) and you will not hear any sound. The red LED will be illuminated. Another press on this button un-mutes the outputs.
4. TAPE/MONITOR: Use this button to select the Tape IN input. Pressing this button has the same effect as pressing the TAPE button on the front panel. Note: The LED of the selected input (see 4.) will remain illuminated.
5. 1 - 6: To select inputs CD SYM to LINE 3 (Note: 7, 8, 9 and 0 do not function): 1 CD SYM balanced CD input 2 CD unbalanced CD input 3 TUNER unbalanced Tuner 4 LINE 1 unbalanced line input 1 5 LINE 2 unbalanced line input 2 6 LINE 3 unbalanced line input 3
6. ñ -button: Pressing this big triangular button has the same effect as rotating the VOLUME control on the front panel clockwise. You increase the volume and the volume control will turn clockwise.
7. ò -button: Pressing this big triangular button has the same effect as rotating the VOLUME control on the front panel anti-clockwise. You decrease the volume and the volume control will turn counter-clockwise.
Note: The ñ - and ò -button by default control volume of the Project Two Mk2 only, even if you have selected Tuner or CD.
SPHINX Project Two Mk2 Service Manual
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Operation
The Sphinx Remote is used with several different models and can therefore transmit different control codes, depending on which model has been selected with the select buttons (3.).
Important: Always press the PRE-AMP button before you send a command (even if you only have one Sphinx component).
Otherwise it is possible that, although the Remote sends a signal (LED blinks), nothing happens because the transmitted signal is not 'recognised' by the component. Indoors the Remote may be used up to a distance of 7 meter, provided there is no strong sunlight in the room and if you aim the Remote at the component. Always aim the Remote straight at the front panel of the component, the maximum offset angle is 30°.
Selecting without switching
Suppose, for instance, that you would like to select the Tuner to Radio 4 without interrupting CD playback. In that case you momentarily depress (not longer than 0.5 sec) the 'TUNER' button and the '4' button. If you depress the select button for longer than 0.5 sec, the system will select a different signal source (in our example you will then hear the Tuner playback).
Batteries
The two batteries have a life span of approximately one year during normal use, but shorter when used more intensely. Replacement batteries: 1.5 V, penlight or AAA (one of these codes is indicated on the packaging and the batteries). You may also use rechargeable 1.5 V batteries.
Note: Position the new batteries exactly as shown in the illustration at the bottom of the battery compartment, otherwise the remote control does not function!
Encountering problems...
Remote Control does not work
Wrong component selected Select the correct one Wrong Remote mode ('Learn'
instead of Normal)
Select correct mode
Wrong command programmed Re-program with Learn
mode
Distance to component exceeds 7 m
Use Remote at closer range
Angle between Remote and component exceeds ±30°
Decrease angle
Sensor window on front dirty Clean window Batteries empty or incorrectly
placed
Use new batteries or replace the old ones
correctly Strong (sun)light in room Shade off light source Component is not switched on
(!)
Switch it on
Memory erased Re-program completely
Component reacts differently than expected or not at all
Wrong component selected Select the correct one Component or Remote does
not function
Check component with
its original remote Batteries in remote empty Use new batteries
SPHINX Project Two Mk2 Service Manual
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7. TECHNICAL SPECIFICATIONS
Bandwidth 0 - 500,000 Hz (+0/-3 dB) Phase response error <0.5° Gain 18 dB max. THD+N (IHF-A) <0.0015% (2nd harm., 10 - 20,000 Hz) IMD <0.003% S/N ratio (IHF-A) >100dB Channel separation >100 dB
Inputs 1x XLR balanced
5x cinch unbalanced (gold-plated) level, nominal (for 1 V output) 0.13 V (-18 dBV) impedance XLR: 10 kohm / cinch: 50 kohm
Outputs 1x XLR balanced
2x cinch unbalanced (gold-plated)
1x cinch Tape (gold-plated) level 9.2 V max. (19.3 dBV) (1 - 100,000 Hz, THD
<0.002%) impedance <10 ohm
Volume control ALPS motorised channel imbalance less than 2 dB
Sphinx Control 1x optical Remote control full function Mechanical decoupling of housing Transrotor absorbing 'pucks' Power supply external, completely stabilised
Supply capacitance 35,200 µF total Power consumption 15 W stand-by
17,5 W 'on' Dimensions (h x w x d) 68 x 482 x 328 mm Weight 11 kg
This unit conforms to the EMC interference regulations issued by the EU and to the CE standards. This unit complies with safety regulation VDE 0860 and therefore with international safety regulation IEC 65.
Technical specifications may be changed by SPHINX without prior notice if technical developments make this necessary.
©1998 Audioscript BV
SPHINX Project Two Mk2 Service Manual
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8. ADJUSTMENT PROCEDURES
The Project Two Mk2 only has two parameters that might need adjustment:
- Bias: to set the bias current and bias voltage of the amplifier.
- Offset: to set the DC-offset voltage of the output.
These adjustments might be necessary when the amplifier has been used for a period of time (and settings have changed due to ageing) or when a part of the Project Two Mk2 have been replaced.
After opening the Project Two Mk2 (by removing the 6 screws in the bottom), the following sections will be visible:
- The Mains Transformer.
- The Main Print Board with inputs, outputs, the dual power supply and both amps.
- The Display Print Board.
Bias and Offset
Both adjustment procedures use the same controls: potmeters P1 & P2 (Left Channel) and potmeters P3 & P4 (Right Channel).
At first both Bias parameters should be set (re. the bias current and bias voltage of output transistors). The positive and negative bias are adjusted separately. This may result in an output DC-offset voltage which has to be adjusted afterwards.
Proper DC-offset adjustment is very important.
A simple trick will greatly increase the accuracy of this critical adjustment (see also the drawing titled “Connection Diagram for testing the Project Two Mk2” at page 13). By connecting a DC-coupled power amp to the Project Two Mk 2 outputs and measuring the offset at the speaker outputs, the offset is boosted to around 30 times the original value!
Note: We strongly recommend that you use a power amp with a very low DC-offset, such as the Project Eighteen. Note: The pre-amp and the power amp should be switched on at least 1 hour before performing this adjustment so they can reach optimum working temperatures.
Initial Set-up
• Connect a low distortion signal generator (<0.002% internal distortion) to an input of the pre-amp.
• Connect the distortion analyser input, the DC mV-meter and the oscilloscope to an output of the pre-amp.
Bias / Offset Adjustment
• Short-circuit the input.
• Measure the voltage across resistor R102 (Left)
and R110 (Right). Both should read 9 V (+/- 500 mV). Adjust the value with potmeter P1 (Left) and potmeter P3 (Right), see file Pj2Adjust.PDF. This will set the bias for one side of the differential amp. The Offset is not important.
• Measure the voltage across resistor R117 (Right) and R109 (Left). Both should read 9 V (+/- 500 mV). Adjust the value with potmeter P4 (Right) and potmeter P2 (Left), see file Pj2Adjust.PDF. This will set the bias for the other side of the differential amp.
The Offset should now also be correct (<1 mV). Although due to small variances in components it may be higher so you have to re-adjust it.
• Turn the volume control to MAX. The mV-meter should show an Offset of less than 1 mV. If this is not the case please re­adjust the value with potmeters P1 and P2 (Left) and/or P3 and P4 (Right).
• Select a 1V / 1 kHz signal at the function generator.
• Check the output for the correct THD (<0.005%) and clip-level (>10 V).
• If all values are correct this will indicate the Project Two Mk2 is properly adjusted and the procedure is now completed.
SPHINX Project Two Mk2 Service Manual
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9. PROBLEMS AND SOLUTIONS
At the moment of writing the Project Two Mk2 has two known specific problems. If in the future you encounter any problem(s) you may enter the info 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/file
Volume potmeter has not enough gain range
Overall Gain of pre-amp is too high
Change R76 (left channel) and R85 (right channel) from 3k33 to 1k8.
Pj2Adjust.PDF
Oscillation problem at balanced output
Not enough frequency compensation across U2 and U3
Install a ceramic condenser (56 pF / 50 V) between pin 2 and pin 6 of U2 and U3
Pj2Adjust.PDF
SPHINX Project Two Mk2 Service Manual
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10. DIAGRAMS AND PARTS LISTS
The next pages contain a complete set of schematic drawings including the associated parts lists (if applicable).
SPHINX Project Two Mk2 Service Manual
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Connection Diagram for testing the Project 2 Mk2
Right
Left
(+)
(+)
(-)
(-)
Amplfier (30x)
A
B
AMPLIFIER
out1 out2
inp2
inp1
gnd
THD
Amplitude
Frequency
Oscillator
THD out
(+) (-) (+) (-)
THD ANALYZER
Right
Left
(+)
(+)
(-)
(-)
Pre-amplfier (3x)
A
B
(+)
(+)
(-)
(-)
PRE-AMPLIFIER
out1 out2
inp2inp1
Scoop
SWITCH-BOX
x
y
inp2
time/div
inp1
gnd
SCOOP
SPHINX Project Two Mk2 Service Manual
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Schematic overview of Project 2 mainboard
+22V
-22V
+D24V
POWER-SUPPLY PJ02PS.SCH
+22V
-22V
+D24V +22V
-22V L-INPUT
+L-OUTR
LEFT LINE-AMP PJ02LAMP.SCH
+22V
-22V L-INPUT
+L-OUTR
+22V
-22V
R-INPUT
+R-OUTR
RIGHT LINE-AMP PJ02RAMP.SCH
+22V
-22V
R-INPUT
+R-OUTR
-R-OUT
-L-OUT
+R-OUT
+L-OUT
R-INPUT
L-INPUT
+D24V
M1
M2
-22V
+22V
INPUT/OUTPUT SELECTION PJ02INP.SCH
-R-OUT
-L-OUT
+R-OUT
+L-OUT
R-INPUT
L-INPUT
+D24V
M1
M2
-22V
+22V
-L-OUT
-R-OUT
+L-IN
+R-IN
-22V
+22V
PHASE-INVERTER PJ02PH.SCH
-L-OUT
-R-OUT
+L-IN
+R-IN
-22V
+22V
MP5 AGND
C78
220P
C77
220P
R143 1K00
R142 1K00
CN21
AGND
R64 600R
R65 600R
AGND
SP2
SP1
SP6
SP5
SP4
AGND
-22V-22V-22V
-22V
+22V
+22V+22V+22V
+22V
-22V
+D24V
+D24V
CN22
SPHINX Project Two Mk2 Service Manual
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Project 2 power supply overview
R19
R9
14V
14V
14V
14V
120V
120V
T1 R-CORE 50VA SEC
R14 10K0
B1
R1
R3
C2
100N
C1
100N
DGND
+D24V
R4
Vin
1
GND
2
+24V
3
U1 L7824C
+
C3 330U
R20
R8
C64
100N
DGND
AGND
U1
U2
U3
U4
+22V
AGND
-22V
project-2 analog power supply pj2aps.sch
U1
U2
U3
U4
+22V
AGND
-22V
R18 R11
R17
R10
R1, R3, R4,R8..R11, R17..R120 : 11 X 10R0
+22V
AGND
+22V
50V
SPHINX Project Two Mk2 Service Manual
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Project 2 power supply
C11
220N
C8
220N
C10
220N
C9
220N
C7
220N
C4
220N
C6
220N
C5
220N
R21 10R0
R16 10R0
T2 C3298
T3 A1306
R32 8R6
R31 8R6
R50 10K0
R35 10K0
LD1 LED red
+
C33 330U/50V
+
C32 330U/50V
R48 2K00
R49 10K0
R44 1K00
R43 10K0
R41 1K00
R37 2K00
R36 10K0
R42 10K0
+22V
-22V
AGND
C37
220N
C36
220N
LD5
LED red
LD4
LED red
LD3
LED red
LD6
LED red
LD2 LED red
T5 A1306
T4 C3298
+
C43+C42
+
C40+C41 C44
220N
C45
220N
+
C16
+
C24
+
C23
+
C15
+
C25
+
C17
D7 D8
D6 D5
D3D1D4
D2
R13 10R0
R6 10R0
+
C14
+
C21
+
C20
+
C13
+
C22
+
C12
R7 10R0
R12 10R0
R22 10R0
R15 10R0
T7 C2240
R46 332R
R47 332R
R45 150R
R40 150R
R38 332R
R39 332R
T9 C2240
T8 A970
T6 A970
C29
220N
C28
220N
U2
U1
U3
U4
AGND
D1..D8 : 8 X 1N4001 C12..C17
C20..C25 : 16 X 2200U/63V C40..C43
14VAC
14VAC
-22V (+/-1V)
+22V (+/-1V)
SPHINX Project Two Mk2 Service Manual
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Project 2 input selection
1
3
2
CN4
CN16ACN16BCN13ACN13BCN1A CN1B CN17A CN17B CN12A
132
CN3
132
CN2
+
RL8
+
RL7
+
RL6
+
RL5
+
RL4
+
RL9
+
RL2
+
RL1
OGNDOGND
OGND
+R-OUT
-R-OUT
+L-OUT
-L-OUT +D24V
U4
OPA604AP
R54 5K00
R53 5K00
R56 15K0
R57 15K0
AGND
AGND
R58 1R00
R52 1R00
C39
220N
C47
220N
+
C38 330U/50V
+
C46 330U/50V
AGND
1
3
2
CN5
U5
OPA604AP
R62 5K00
R61 5K00
R66 15K0
R67 15K0
AGND
AGND
R68 1R00
R60 1R00
C49
220N
C51
220N
+
C48 330U/50V
+
C50 330U/50V
AGND
+
RL3
CDTUNERLINE 1LINE 2LINE 3TAPE INTAPE OUTOUT 1OUT 2OUT 3 CD SYM
R-INPUT
L-INPUT
R144 600R
R145 600R
+D24V
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
CN19
DGND
OPT1 OPTOUT
C102 33PF
R55 100K
C101 33PF
R63 100K
AGND
AGND
+D24V
+D24V
R2 4K75
M1
M2
1
4
CN20
+22V
-22V
12J212
J5
AGND
R23 24R9
R5 24R9
SP3
R70 24R9
R71 24R9
1
4
CN18
AGND
AGND
O2
O8 O3 O4 O5 O6 O7 O1
O2
O1
O3
O4
O5
O6
O7
O8
AGND
AGND
+22V
-22V
+22V
-22V
to display
SPHINX Project Two Mk2 Service Manual
18
Project 2 left pre-amp
T26 K389
T25 J109
R128 100R
R122 100R
R124 100R
R126 100R
LD10
LED red
LD8
LED red
T31 C2240
T22 C2240
T24 A970
T30 A970
R107 2K21
R106 2K21
R105 2K21
R104 2K21
T35 A970
R133 243R
R109 2K21
LD16
LED red
LD15
LED red
T34 C2240
R102 2K21
R138 33K2
R130 243R
R132 200R
R131 200R
R119 200R
R118 200R
R108 51R0
R93 600R
R103 51R0
R92 600R
T14 C2705
D11
D10
R97 18R0
R96 18R0
R90 4K75 C56
470P
R100 10R0
C58
47P
R77 10R0
R75 10R0
R79 243R
R73 243R
R72 100R
R80 100R
R78 51R0
R74 51R0
R76 4K75
P2 50R
T11 A1306
T10 C3298
LD9
LED red
C53
C52
1
4
CN9
1
4
CN8
1
4
CN6
1
2
3
4
5
6
7
8
CN14
C70
10N
C69
10N
T16 C2705
T15 A1145
D9
D12
T17 A1145
P1 50R
LD7
LED red
+22V
-22V
R141 600R
12
J3
+
C74 330U/50V
C73
+
C66
+
C65
+
C61
+
C60
+L-OUT
+L-OUTR
AGND AGND
AGND
AGND
AGND AGND
AGND
L-INPUT
+22V (+/-1V)
-22V (+/-1V)
LED voltage approx. 1.8V
± 4mA
± 7.5mA± 7.5mA
± 4mA
SPHINX Project Two Mk2 Service Manual
19
Project 2 right pre-amp
T29 K389
T28 J109
R129 100R
R123 100R
R125 100R
R127 100R
LD14
LED red
LD12
LED red
T33 C2240
T23 C2240
T27 A970
T32 A970
R115 2K21
R114 2K21
R113 2K21
R112 2K21
T37 A970
R137 243R
R117 2K21
LD18
LED red
LD17
LED red
T36 C2240
R110 2K21
R139 33K2
R134 243R
R136 200R
R135 200R
R121 200R
R120 200R
R116 51R0
R95 600R
R111 51R0
R94 600R
T18 C2705
D15
D14
R99 18R0
R98 18R0
R91 4K75 C57
470P
AGND
R101 10R0
C59
47P
R86 10R0
R84 10R0
R88 243R
R82 243R
R81 100R
R89 100R
R87 51R0
R83 51R0
R85 4K75
P4 50R
T13 A1306
T12 C3298
LD13
LED red
C55
C54
AGND
AGND
1
4
CN11
4PIN
1
4
CN10
4PIN
1
4
CN7
4PIN
1
2
3
4
5
6
7
8CN15
8PIN
C72
10N
C71
10N
AGND
T20 C2705
T19 A1145
D13
D16
T21 A1145
P3 50R
LD11
LED red
+22V
R-INPUT +R-OUT
R140 600R
AGND
+R-OUTR
12
J4
+
C75 330U/50V
C76
+
C68
+
C67
+
C63
+
C62
AGND
AGND
-22V
± 4mA
± 4mA
-22V (+/-1V)
± 7.5mA ± 7.5mA
+22V (+/-1V) LED voltage approx. 1.8V
SPHINX Project Two Mk2 Service Manual
20
Project 2 phase inverter
U3
OPA604AP
R30 10K0
R33 10K0
+R-IN
-R-OUT
OGND
+22V
-22V
R51 1R00
R29 1R00
C31
220N
C35
220N
+
C30 330U/50V
+
C34 330U/50V
AGND
+VR
-VR
+VR
-VR
U2
OPA604AP
R25 10K0
R27 10K0
+L-IN
-L-OUT
OGND
+22V
-22V
R28 1R00
R24 1R00
C19
220N
C27
220N
+
C18 330U/50V
+
C26 330U/50V
AGND
+VL
-VL
+VL
-VL
R34 24R9
R26 24R9
CM1
5P6
CM2 5P6
SPHINX Project Two Mk2 Service Manual
21
Project 2 display
Xtal
10
EXtal
11
MD1
12
MD0
13
NMI
14
VCC
15
STBY
16
GND
17
P40
19
P41
20
P42
21
P43
22
P44
23
P45
24
P46
25
P47
26
nc
18
P5027P5128P5229P5330P5431P5532P7033P7134nc35P7236P7337P7438P75/WR39P76/RD40P7741VCC42P27
43
RES
9
P668P657P646P635P624P613P60
2nc1
P3061P3162P3263P3364P3465P3566P3667P37
68
P26
44
P25
45
P24
46
P23
47
P22
48
P21
49
P20
50
nc
51
GND
52
P17
53
P16
54
P15
55
P14
56
P13
57
P12
58
P11
59
P10
60
H8
U3
H8/325 HD6413258CP10
U4
8,00000MHz
C7
33p
C5
33p
2 1
S2
2 1
S4
2 1
S3
V+
2
D
1
GND
3
IR
IR1
R1
5R62
R2
61K9
Standby Tape-mMute
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
CN1
18PIN
+
C1
C47U/16V
LD3 LD4 LD5 LD6 LD7
CD
TUNER
LINE1
LINE2
LINE3
R8
390R
R3
390R
TAPE-M
S1
Input-selector
LD8 LD2
CD-S
STB
R10
390R
VOUT
1
PFI
4
PFO
5
WDI
6
RES
7
VBAT
8
U5 MAX690
C3
100NMKT
+
C2
C25V/470U
C4 100NMKT
R6
10K
R5
39K2
Vin
1
GND
2
+5V
3
U1 MC7805
IN1
1
IN2
2
IN3
3
IN4
4
IN5
5
IN6
6
IN7
7
IN8
8
GND
9
OUT8
11
OUT7
12
OUT6
13
OUT5
14
OUT4
15
OUT3
16
OUT2
17
OUT1
18
K
10
U2 ULN2804
RL2
OPTO
RL8
RL3
RL4
RL5
RL6
M2
RL7
M1
RL1
RL2 RL8 RL3 RL4 RL5 RL6 RL7 RL1
IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
C6
100NMKT
LD9
R11
390R
R9
10K
GND
GND
GND
GND
GND
+24
T8
T2SA970
GND
+24
VCC
VCC
VCC
VCC
VCC
R G
LD1
T1
T2SC2240
T2
T2SA970
R4
10K
GND
T5 T2SC2240
T7T2SC2240
T4 T2SA970
T6T2SA970
VCC
GND
M1M2
T3 T2SC2240
R7
10K
GND
GND
OPTO
+24
P30
P31
P32
P33
P34
P35
P36
P37
P35
P34
P31
P32
P33
P30
P36
M
M
MUTE
STANDBY
PCB 02601B-AS-SISW
1
PFI
PFI
C9
100NMKT
C8
100NMKT
SPHINX Project Two Mk2 Service Manual
22
PCB drawings of Project 2 Mk2
Because there is a significant image-quality loss during the conversion of the drawings, the PCB-drawings are located in seperate files. These files are in PDF-format (Adobé Acrobat 3.0 Reader).
• Pj2Main.PDF for Mainboard
• Pj2Display.PDF for Displayboard
• Pj2Adjust.PDF for adjustment procedures
SPHINX Project Two Mk2 Service Manual
23
Partlist pre-amp
Designator Part Type Description
B1 W02M Bridge rectifier
C1 100nF MKT capacitor C10 220nF MKT capacitor C101 33pF Ceramic capacitor C102 33pF Ceramic capacitor C11 220nF MKT capacitor C12 2200uF/63V Electrolytic capacitor C13 2200uF/63V Electrolytic capacitor C14 2200uF/63V Electrolytic capacitor C15 2200uF/63V Electrolytic capacitor C16 2200uF/63V Electrolytic capacitor C17 2200uF/63V Electrolytic capacitor C18 330uF/50V Electrolytic capacitor C19 220nF MKT capacitor C2 100nF MKT capacitor C20 2200uF/63V Electrolytic capacitor C21 2200uF/63V Electrolytic capacitor C22 2200uF/63V Electrolytic capacitor C23 2200uF/63V Electrolytic capacitor C24 2200uF/63V Electrolytic capacitor C25 2200uF/63V Electrolytic capacitor C26 330uF/50V Electrolytic capacitor C27 220nF MKT capacitor C28 220nF MKT capacitor C29 220nF MKT capacitor C3 330uF/50V Electrolytic capacitor C30 330uF/50V Electrolytic capacitor C31 220nF MKT capacitor C32 330uF/50V Electrolytic capacitor C33 330uF/50V Electrolytic capacitor C34 330uF/50V Electrolytic capacitor C35 220nF MKT capacitor C36 220nF MKT capacitor C37 220nF MKT capacitor C38 330uF/50V Electrolytic capacitor C39 220nF MKT capacitor C4 220nF MKT capacitor C40 2200uF/63V Electrolytic capacitor C41 2200uF/63V Electrolytic capacitor C42 2200uF/63V Electrolytic capacitor C43 2200uF/63V Electrolytic capacitor C44 220nF MKT capacitor C45 220nF MKT capacitor C46 330uF/50V Electrolytic capacitor C47 220nF MKT capacitor C48 330uF/50V Electrolytic capacitor C49 220nF MKT capacitor
SPHINX Project Two Mk2 Service Manual
24
Designator Part Type Description
C5 220nF MKT capacitor C50 330uF/50V Electrolytic capacitor C51 220nF MKT capacitor C52 220nF MKT capacitor C53 220nF MKT capacitor C54 220nF MKT capacitor C55 220nF MKT capacitor C56 470pF Styroflex capacitor C57 470pF Styroflex capacitor C58 47pF Styroflex capacitor C59 47pF Styroflex capacitor C6 220nF MKT capacitor C60 47uF/25V Electrolytic capacitor C61 47uF/25V Electrolytic capacitor C62 47uF/25V Electrolytic capacitor C63 47uF/25V Electrolytic capacitor C64 100nF MKT capacitor C65 47uF/25V Electrolytic capacitor C66 47uF/25V Electrolytic capacitor C67 47uF/25V Electrolytic capacitor C68 47uF/25V Electrolytic capacitor C69 10nF MKT capacitor C7 220nF MKT capacitor C70 10nF MKT capacitor C71 10nF MKT capacitor C72 10nF MKT capacitor C73 220nF MKT capacitor C74 330uF/50V Electrolytic capacitor C75 330uF/50V Electrolytic capacitor C76 220nF MKT capacitor C77 220pF Styroflex capacitor C78 220pF Styroflex capacitor C8 220nF MKT capacitor C9 220nF MKT capacitor CM1 56pF Ceramic capacitor CM2 56pF Ceramic capacitor
CN1 CINCH4P Cinch plug CN10 4PIN 4 pins header CN11 4PIN 4 pins header CN12 CINCH2P Cinch plug CN13 CINCH4P Cinch plug CN14 8PIN 8 pins header CN15 8PIN 8 pins header CN16 CINCH4P Cinch plug CN17 CINCH4P Cinch plug CN18 4PIN 4 pins header CN19 18PIN 4 pins header CN2 XLR-M XLR connector male CN20 4PIN 4 pins header
SPHINX Project Two Mk2 Service Manual
25
Designator Part Type Description
CN21 PHONEJACK Phone jack CN22 KAST_GND Ground connection with case CN3 XLR-Male XLR connector male CN4 XLR-Female XLR connector female CN5 XLR-Female+B51 XLR connector female CN6 4PIN 4 pins header CN7 4PIN 4 pins header CN8 4PIN 4 pins header CN9 4PIN 4 pins header
D1 1N4001 Diode D10 1N4148 Diode D11 1N4148 Diode D12 1N4148 Diode D13 1N4148 Diode D14 1N4148 Diode D15 1N4148 Diode D16 1N4148 Diode D2 1N4001 Diode D3 1N4001 Diode D4 1N4001 Diode D5 1N4001 Diode D6 1N4001 Diode D7 1N4001 Diode D8 1N4001 Diode D9 1N4148 Diode
J2 Jumper Jumper J5 Jumper Jumper
LD1 LED red LED red LD10 LED red LED red LD11 LED red LED red LD12 LED red LED red LD13 LED red LED red LD14 LED red LED red LD15 LED red LED red LD16 LED red LED red LD17 LED red LED red LD18 LED red LED red LD2 LED red LED red LD3 LED red LED red LD4 LED red LED red LD5 LED red LED red LD6 LED red LED red LD7 LED red LED red LD8 LED red LED red LD9 LED red LED red
OPT1 173298-2 Optical output
SPHINX Project Two Mk2 Service Manual
26
Designator Part Type Description
P1 50R Adjustable pot. P2 50R Adjustable pot. P3 50R Adjustable pot. P4 50R Adjustable pot. P5 ALPS POT M Stereo motor pot.
R1 10R0 Resistor MRS25 R10 10R0 Resistor MRS25 R100 10R0 Resistor MRS25 R101 10R0 Resistor MRS25 R102 2K21 Resistor MRS25 R103 51R0 Resistor MRS25 R104 2K21 Resistor MRS25 R105 2K21 Resistor MRS25 R106 2K21 Resistor MRS25 R107 2K21 Resistor MRS25 R108 51R0 Resistor MRS25 R109 2K21 Resistor MRS25 R11 10R0 Resistor MRS25 R110 2K21 Resistor MRS25 R111 51R0 Resistor MRS25 R112 2K21 Resistor MRS25 R113 2K21 Resistor MRS25 R114 2K21 Resistor MRS25 R115 2K21 Resistor MRS25 R116 51R0 Resistor MRS25 R117 2K21 Resistor MRS25 R118 200R Resistor MRS25 R119 200R Resistor MRS25 R12 10R0 Resistor MRS25 R120 200R Resistor MRS25 R121 200R Resistor MRS25 R122 100R Resistor MRS25 R123 100R Resistor MRS25 R124 100R Resistor MRS25 R125 100R Resistor MRS25 R126 100R Resistor MRS25 R127 100R Resistor MRS25 R128 100R Resistor MRS25 R129 100R Resistor MRS25 R13 10R0 Resistor MRS25 R130 243R Resistor MRS25 R131 200R Resistor MRS25 R132 200R Resistor MRS25 R133 243R Resistor MRS25 R134 243R Resistor MRS25 R135 200R Resistor MRS25 R136 200R Resistor MRS25 R137 243R Resistor MRS25 R138 33K2 Resistor MRS25
SPHINX Project Two Mk2 Service Manual
27
Designator Part Type Description
R139 33K2 Resistor MRS25 R14 10K0 Resistor MRS25 R140 600R Resistor MRS25 R141 600R Resistor MRS25 R142 1K00 Resistor MRS25 R143 1K00 Resistor MRS25 R144 600R Resistor MRS25 R145 600R Resistor MRS25 R15 10R0 Resistor MRS25 R16 10R0 Resistor MRS25 R17 10R0 Resistor MRS25 R18 10R0 Resistor MRS25 R19 10R0 Resistor MRS25 R2 4K75 Resistor MRS25 R20 10R0 Resistor MRS25 R21 10R0 Resistor MRS25 R22 10R0 Resistor MRS25 R23 24R9 Resistor MRS25 R24 1R00 Resistor MRS25 R25 10K0 Resistor MRS25 R26 24R9 Resistor MRS25 R27 10K0 Resistor MRS25 R28 1R00 Resistor MRS25 R29 1R00 Resistor MRS25 R3 10R0 Resistor MRS25 R30 10K0 Resistor MRS25 R31 8R6 Resistor MRS25 R32 8R6 Resistor MRS25 R33 10K0 Resistor MRS25 R34 24R9 Resistor MRS25 R35 10K0 Resistor MRS25 R36 10K0 Resistor MRS25 R37 2K00 Resistor MRS25 R38 332R Resistor MRS25 R39 332R Resistor MRS25 R4 10R0 Resistor MRS25 R40 150R Resistor MRS25 R41 1K00 Resistor MRS25 R42 10K0 Resistor MRS25 R43 10K0 Resistor MRS25 R44 1K00 Resistor MRS25 R45 150R Resistor MRS25 R46 332R Resistor MRS25 R47 332R Resistor MRS25 R48 2K00 Resistor MRS25 R49 10K0 Resistor MRS25 R5 24R9 Resistor MRS25 R50 10K0 Resistor MRS25 R51 1R00 Resistor MRS25 R52 1R00 Resistor MRS25
SPHINX Project Two Mk2 Service Manual
28
Designator Part Type Description
R53 5K00 Resistor MRS25 R54 5K00 Resistor MRS25 R55 100K Resistor MRS25 R56 15K0 Resistor MRS25 R57 15K0 Resistor MRS25 R58 1R00 Resistor MRS25 R6 10R0 Resistor MRS25 R60 1R00 Resistor MRS25 R61 5K00 Resistor MRS25 R62 5K00 Resistor MRS25 R63 100K Resistor MRS25 R64 600R Resistor MRS25 R65 600R Resistor MRS25 R66 15K0 Resistor MRS25 R67 15K0 Resistor MRS25 R68 1R00 Resistor MRS25 R7 10R0 Resistor MRS25 R70 24R9 Resistor MRS25 R71 24R9 Resistor MRS25 R72 100R Resistor MRS25 R73 243R Resistor MRS25 R74 51R0 Resistor MRS25 R75 10R0 Resistor MRS25 R76 4K75 Resistor MRS25 R77 10R0 Resistor MRS25 R78 51R0 Resistor MRS25 R79 243R Resistor MRS25 R8 10R0 Resistor MRS25 R80 100R Resistor MRS25 R81 100R Resistor MRS25 R82 243R Resistor MRS25 R83 51R0 Resistor MRS25 R84 10R0 Resistor MRS25 R85 4K75 Resistor MRS25 R86 10R0 Resistor MRS25 R87 51R0 Resistor MRS25 R88 243R Resistor MRS25 R89 100R Resistor MRS25 R9 10R0 Resistor MRS25 R90 4K75 Resistor MRS25 R91 4K75 Resistor MRS25 R92 600R Resistor MRS25 R93 600R Resistor MRS25 R94 600R Resistor MRS25 R95 600R Resistor MRS25 R96 18R0 Resistor MRS25 R97 18R0 Resistor MRS25 R98 18R0 Resistor MRS25 R99 18R0 Resistor MRS25
SPHINX Project Two Mk2 Service Manual
29
Designator Part Type Description
RL1 Alcatel 24V MT2 DIL relay RL2 Alcatel 24V MT2 DIL relay RL3 Alcatel 24V MT2 DIL relay RL4 Alcatel 24V MT2 DIL relay RL5 Alcatel 24V MT2 DIL relay RL6 Alcatel 24V MT2 DIL relay RL7 Alcatel 24V MT2 DIL relay RL8 Alcatel 24V MT2 DIL relay RL9 Alcatel 24V MT2 DIL relay
SP1 SILPAD Soldering pad SP2 SILPAD Soldering pad SP3 SILPAD Soldering pad SP4 SILPAD Soldering pad SP5 SILPAD Soldering pad SP6 SILPAD Soldering pad
T1 R-CORE 50VA SEC Transformer
T10 2SC3298 Transistor T11 2SA1306 Transistor T12 2SC3298 Transistor T13 2SA1306 Transistor T14 2SC2240 Transistor T15 2SA1145 Transistor T16 2SC2705 Transistor T17 2SA1145 Transistor T18 2SC2240 Transistor T19 2SA1145 Transistor T2 2SC3298 Transistor T20 2SC2705 Transistor T21 2SA1145 Transistor T22 2SC2240 Transistor T23 2SC2240 Transistor T24 2SA970 Transistor T25 2SJ109 Dual P-JFET T26 2SK389 Dual N-JFET T27 2SA970 Transistor T28 2SJ109 Dual P-JFET T29 2SK389 Dual N-JFET T3 2SA1306 Transistor T30 2SA970 Transistor T31 2SC2240 Transistor T32 2SA970 Transistor T33 2SC2240 Transistor T34 2SC2240 Transistor T35 2SA970 Transistor T36 2SC2240 Transistor T37 2SA970 Transistor T4 2SC3298 Transistor
SPHINX Project Two Mk2 Service Manual
30
Designator Part Type Description
T5 2SA1306 Transistor T6 2SA970 Transistor T7 2SC2240 Transistor T8 2SA970 Transistor T9 2SC2240 Transistor U1 L7824C Voltage regulator
U2 OPA604AP IC U3 OPA604AP IC U4 OPA604AP IC U5 OPA604AP IC
SPHINX Project Two Mk2 Service Manual
31
Partlist display
Designator Part Type Description
C1 47uF/16V Electrolytic capacitor C2 470uF/25V Electrolytic capacitor C3 100nF MKT capacitor C4 100nF MKT capacitor C5 33pF Ceramic capacitor C6 100nF MKT capacitor C7 33pF Ceramic capacitor C8 100nF MKT capacitor C9 100nF MKT capacitor
CN1 18PIN 18 pins header
IR1 SHARP GP1U5 Infrared receiver
LD1 LD2C LED LD2 TLL46221C LED red LD3 TLL46221C LED red LD4 TLL46221C LED red LD5 TLL46221C LED red LD6 TLL46221C LED red LD7 TLL46221C LED red LD8 TLL46221C LED red LD9 TLL46221C LED red
R1 5R62 Resistor MRS25 R10 390R Resistor MRS25 R11 390R Resistor MRS25 R2 61K9 Resistor MRS25 R3 390R Resistor MRS25 R4 10K Resistor MRS25 R5 39K2 Resistor MRS25 R6 10K Resistor MRS25 R7 10K Resistor MRS25 R8 390R Resistor MRS25 R9 10K Resistor MRS25
S1 ENCOJ-B24-AE0006 Switch S2 ITW 60 1000 Switch S3 ITW 60 1000 Switch S4 ITW 60 1000 Switch
T1 2SC2240 Transistor T2 2SA970 Transistor T3 2SC2240 Transistor T4 2SA970 Transistor T5 2SC2240 Transistor T6 2SA970 Transistor T7 2SC2240 Transistor
SPHINX Project Two Mk2 Service Manual
32
Designator Part Type Description
T8 2SA970 Transistor
U1 MC7805 IC U2 ULN2804 IC U3 H8/325 HD6413258CP10 IC U4 8,00000MHz X-TAL U5 MAX690 IC
©1998 Audioscript BV Version: 2-09-98
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