Sphinx Project2_MK2 SERVICE MANUAL

SERVICE MANUAL
PROJECT TWO Mk2
PRE-AMP
SPHINX Project Two Mk2 Service Manual
1. UNPACKING.......................................................................................................................................3
2. SPHINX WARRANTY CARD..............................................................................................................3
3. CONTACTING THE MANUFACTURER.............................................................................................3
4. THE PRE-AMP AT A GLANCE ..........................................................................................................4
Front panel................................................................................................................................................... 4
Rear panel ...................................................................................................................................................5
5. OPERATION .......................................................................................................................................6
Power on...................................................................................................................................................... 6
Selecting an input ........................................................................................................................................6
Adjusting the volume level ...........................................................................................................................6
Memory mode..............................................................................................................................................6
Power off...................................................................................................................................................... 6
6. SPHINX REMOTE CONTROL............................................................................................................7
Buttons and LED indication..........................................................................................................................7
Operation.....................................................................................................................................................8
Selecting without switching..........................................................................................................................8
Batteries.......................................................................................................................................................8
Encountering problems................................................................................................................................8
7. TECHNICAL SPECIFICATIONS.........................................................................................................9
8. ADJUSTMENT PROCEDURES........................................................................................................10
Bias and Offset ..........................................................................................................................................10
Initial Set-up...............................................................................................................................................10
Bias / Offset Adjustment ............................................................................................................................10
9. PROBLEMS AND SOLUTIONS .......................................................................................................11
10. DIAGRAMS AND PARTS LISTS....................................................................................................12
Connection Diagram for testing the Project 2 Mk2.....................................................................................13
Schematic overview of Project 2 mainboard..............................................................................................14
Project 2 power supply overview................................................................................................................15
Project 2 power supply...............................................................................................................................16
Project 2 input selection.............................................................................................................................17
Project 2 left pre-amp.................................................................................................................................18
Project 2 right pre-amp ..............................................................................................................................19
Project 2 phase inverter.............................................................................................................................20
Project 2 display.........................................................................................................................................21
PCB drawings of Project 2 Mk2 .................................................................................................................22
Partlist pre-amp..........................................................................................................................................23
Partlist display............................................................................................................................................31
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SPHINX Project Two Mk2 Service Manual
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.
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.
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.
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.
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.
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SPHINX Project Two Mk2 Service Manual
4. THE PRE-AMP AT A GLANCE
Front panel
1
1 2
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.
3 5
4 6 7 8
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.
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SPHINX Project Two Mk2 Service Manual
25
26
Rear panel
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
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).
27 28
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SPHINX Project Two Mk2 Service Manual
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.).
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SPHINX Project Two Mk2 Service Manual
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.
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SPHINX Project Two Mk2 Service Manual
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) Wrong command programmed Re-program with Learn
Distance to component exceeds 7 m
Angle between Remote and component exceeds ±30°
Sensor window on front dirty Clean window Batteries empty or incorrectly
placed
Strong (sun)light in room Shade off light source Component is not switched 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 Batteries in remote empty Use new batteries
Select correct mode
mode Use Remote at closer
range Decrease angle
Use new batteries or replace the old ones correctly
Switch it on
Check component with its original remote
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SPHINX Project Two Mk2 Service Manual
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
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SPHINX Project Two Mk2 Service Manual
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).
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.
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.
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.
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SPHINX Project Two Mk2 Service Manual
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.
Problem Cause Solution Refer to
Volume potmeter has not enough gain range
Overall Gain of pre-amp is too high
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.
page/file
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
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SPHINX Project Two Mk2 Service Manual
10. DIAGRAMS AND PARTS LISTS
The next pages contain a complete set of schematic drawings including the associated parts lists (if applicable).
Connection Diagram for testing the Project 2 Mk2.....................................................................................13
Schematic overview of Project 2 mainboard..............................................................................................14
Project 2 power supply overview................................................................................................................15
Project 2 power supply...............................................................................................................................16
Project 2 input selection.............................................................................................................................17
Project 2 left pre-amp.................................................................................................................................18
Project 2 right pre-amp ..............................................................................................................................19
Project 2 phase inverter.............................................................................................................................20
Project 2 display.........................................................................................................................................21
PCB drawings of Project 2 Mk2 .................................................................................................................22
Partlist pre-amp..........................................................................................................................................23
Partlist display............................................................................................................................................31
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SPHINX Project Two Mk2 Service Manual
Connection Diagram for testing the Project 2 Mk2
Oscillator
Frequency
Amplitude
THD
THD ANALYZER
gnd
out1 out2
(+) (-) (+) (-)
inp2
inp1
THD out
(+)
(+)
(+)
(-)
A
Left
(-)
A
(-)
Pre-amplfier (3x)
(+)
(+)
(+)
(-)
B
(-)
Right
PRE-AMPLIFIER
(-)
B
SCOOP
Left
Right
Amplfier (30x)
AMPLIFIER
gnd
time/div
x
y
inp2
inp1
Scoop
inp2inp1
out1 out2
SWITCH-BOX
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SPHINX Project Two Mk2 Service Manual
Schematic overview of Project 2 mainboard
INPUT/OUTPUT SELECTION
+D24V
PJ02INP.SCH
+D24V
+D24V
-R-OUT
-R-OUT +R-OUT
+R-OUT
-L-OUT
-L-OUT +L-OUT
+L-OUT
+22V
+22V
L-INPUT
L-INPUT
R-INPUT
R-INPUT
+22V
-22V
-22V
-22V
M2
M2 M1
M1
POWER-SUPPLY PJ02PS.SCH
+22V
+D24V
+22V
+D24V +22V
+D24V
-22V
-22V
CN22
SP4
AGND
SP1
SP2
PHASE-INVERTER PJ02PH.SCH
+22V
+22V
-L-OUT
-L-OUT +L-IN
+L-IN
+R-IN
+R-IN
-R-OUT
-R-OUT
-22V
-22V
CN21
AGND
R64 600R
R65 600R
LEFT LINE-AMP PJ02LAMP.SCH
+22V
+22V+22V+22V
SP6
+L-OUTR
-22V
+22V
SP5
-22V-22V-22V
+L-OUTR
-22V
-22V
RIGHT LINE-AMP PJ02RAMP.SCH
+22V
+22V
+R-OUTR
+R-OUTR
-22V
-22V
L-INPUT
L-INPUT
R-INPUT
R-INPUT
MP5 AGND
AGND
220P C77
220P C78
R142 1K00
R143 1K00
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SPHINX Project Two Mk2 Service Manual
Project 2 power supply overview
R3
T1 R-CORE 50VA SEC
120V
120V
14V
14V
14V
14V
R1
R1, R3, R4,R8..R11, R17..R120 : 11 X 10R0
B1
R4
+
C3 330U
50V
100N C2
U1 L7824C
1
Vin
GND
2
DGND
+24V
3
100N C1
+D24V
100N C64
DGND
AGND
R14 10K0
R19
R20 R17
R18 R11
R10 R9
R8
project-2 analog power supply pj2aps.sch
U1
U1
U2
U2
U3
U3
U4
U4
+22V
+22V
AGND
AGND
-22V
-22V
+22V
AGND
+22V
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SPHINX Project Two Mk2 Service Manual
Project 2 power supply
14VAC
14VAC
U1
U2
U3
U4
220N C11
D7 D8
220N
D6 D5
C8
220N C6
D1D4D2
220N C5
220N C10
220N C9
+
C15
+
C12 220N C7
220N
D3
C4
R21 10R0
R22 10R0
+
+
C16
C17
+
+
C14
C13
R15 10R0
R16 10R0 R12 10R0
R13 10R0
R6 10R0
R7 10R0
+
+
C24
C23
+
+
C21
C20
D1..D8 : 8 X 1N4001 C12..C17
C20..C25 : 16 X 2200U/63V C40..C43
+
C25
+
C22
T3 A1306
R32 8R6
LD2 LED red
220N C29
220N C28
LD1
LED red R31 8R6
T2 C3298
220N C37
R50 10K0
R35 10K0
220N
C36
T5 A1306
T4 C3298
R49 10K0
R48 2K00
R37 2K00
T8 A970
R36 10K0
R46
R47
332R
332R
T7
T9
C2240
C2240
R44 1K00
R45
+
150R
C33 330U/50V
+
R40
C32
150R
330U/50V T6 A970
R41 1K00
R38
R39
332R
332R
R43 10K0
LED red LD6 LED red LD5
LED red LD4 LED red LD3
R42 10K0
+
C43+C42
+
C40+C41 C44
+22V (+/-1V)
+22V
220N C45
AGND
AGND
220N
-22V
-22V (+/-1V)
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SPHINX Project Two Mk2 Service Manual
Project 2 input selection
CDTUNERLINE 1LINE 2LINE 3TAPE INTAPE OUTOUT 1OUT 2OUT 3 CD SYM
CN2
132
+D24V
RL1
+
SP3
OGND
R5
-L-OUT +D24V
+L-OUT
-R-OUT +R-OUT
24R9
CN3
132
OGNDOGND
RL2
+
R23 24R9
O2
R-INPUT
L-INPUT
R144
R145
600R
600R
RL4
RL9
+
O1
O3
AGND
RL6
RL5
+
O4
+
+
O5
CN16ACN16BCN13ACN13BCN1A CN1B CN17A CN17B CN12A
12J212
J5
R70 24R9
R71 24R9
RL8
RL7
+
O6
RL3
+
+
O7
O8
+D24V
O2
DGND
O8 O3 O4 O5 O6
M2
O7
M1
O1
+D24V
R2 4K75
OPT1 OPTOUT
CN19
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
to display
R60
+22V
+
C48 330U/50V
+
C50 330U/50V
+
C46 330U/50V
+
C38 330U/50V
1R00
R68
-22V
1R00
R52
+22V
1R00
R58
-22V
1R00
AGND
AGND
220N C49
AGND
AGND
220N C51
220N C47
AGND
AGND
220N C39
AGND
1
R67
3
CN5
2
15K0
AGND
3
R62 5K00
R63 100K
AGND
1
R57
CN4
2
15K0
R54 5K00
R55 100K
AGND
CN20
1
+22V
AGND
4
-22V
CN18
1
AGND
4
C101 33PF
R66 15K0
U5
OPA604AP
R61 5K00
C102 33PF
R56 15K0
U4
OPA604AP
R53 5K00
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SPHINX Project Two Mk2 Service Manual
Project 2 left pre-amp
CN14
L-INPUT
8 7 6 5 4 3 2 1
+22V (+/-1V)
AGND
-22V (+/-1V)
+22V
LED voltage approx. 1.8V
P2
LED red
LD16
R138 33K2
LED red
LD15
-22V
50R
+
R133
C66
243R
T35 A970
R109
± 4mA
2K21
+
C61
+
C60
R102
± 4mA
2K21
T34 C2240
R130 243R
+
C65
P1 50R
LED red
LD10 LED red
LD9
LED red
LD8 LED red
LD7
T31 C2240
T30 A970
R132 200R
R131 200R
R107 2K21
R104 2K21
R128 100R
R126 100R
D12
R106 2K21
R108 51R0
T22 C2240
T26 K389
R122
R119
100R
200R
C58
R100 10R0
47P
R124
R118
100R
200R
T25 J109
T24 A970
R103 51R0
R105 2K21
D9
R76 4K75
R141 600R
12
J3
+
C73
AGND
10N
R93 600R
C70
AGND AGND
D11
R97 18R0
470P R90 4K75 C56
C74 330U/50V
AGND
R96 18R0
D10
AGND AGND
R92
10N
600R
C69
T17 A1145
T14 C2705
R79 243R
± 7.5mA± 7.5mA
R73 243R
T16 C2705
T15 A1145
R78 51R0
R74 51R0
R80 100R
C53
T11 A1306
R77 10R0
R75 10R0
T10 C3298
R72 100R
C52
CN9
1
4
+L-OUT
CN6
4
1
+L-OUTR
CN8
4
1
18
SPHINX Project Two Mk2 Service Manual
Project 2 right pre-amp
+22V (+/-1V) LED voltage approx. 1.8V
+22V
LED red
+
P4
C68
LD18
R139 33K2
R-INPUT +R-OUT
8CN15 7 6 5 4 3 2 1
AGND
8PIN
LED red
LD17
-22V
-22V (+/-1V)
50R
R137 243R
T37 A970
R117
± 4mA
2K21
+
C63
+
C62
R110
± 4mA
2K21
T36 C2240
R134 243R
P3
+
50R
C67
LED red
LD13 LED red
LD14
LED red
LD12 LED red
LD11
T33 C2240
T32 A970
R136 200R
R135 200R
R115 2K21
R112 2K21
R129 100R
R127 100R
D16
R114 2K21
R116 51R0
T23 C2240
T29 K389
R123
R121
100R
200R
C59
R101 10R0
47P
R125
R120
100R
200R
T28 J109
T27 A970
R113 2K21
D13
R85 4K75
R140 600R
12
J4
+
C76
AGND
C75 330U/50V
AGND
R91 4K75 C57
AGND
R111 51R0
AGND
10N C72
470P
10N C71
R95
R88
600R
243R
± 7.5mA ± 7.5mA
T21 A1145
T20 C2705
D15
R99 18R0
R98 18R0
D14
T19 A1145
T18 C2705
R82
243R R94 600R
R87 51R0
R83 51R0
AGND
AGND
R89 100R
C55
T13 A1306
R86 10R0
R84 10R0
T12 C3298
R81 100R
C54
CN11
1
4
4PIN
CN7
4
1
4PIN
+R-OUTR
CN10
4
1
4PIN
19
SPHINX Project Two Mk2 Service Manual
CM1
Project 2 phase inverter
+22V
-22V
+22V
-22V
R29 1R00
AGND
R51 1R00
R24 1R00
AGND
R28 1R00
220N C31
220N C35
220N C19
220N C27
+VR
+
C30 330U/50V
+
C34 330U/50V
-VR
+VL
+
C18 330U/50V
+
C26 330U/50V
-VL
+R-IN
+L-IN
R30 10K0
R25 10K0
OGND
OGND
R33 10K0
R27 10K0
5P6
+VR
-VR
CM2 5P6
+VL
-VL
U3
OPA604AP
U2
OPA604AP
R34
-R-OUT
24R9
R26
-L-OUT
24R9
20
SPHINX Project Two Mk2 Service Manual
C25V/470U
Project 2 display
VCC
R1
5R62
R2
P30
IR1
V+
D
IR
GND
61K9
2
+
C1
C47U/16V
1 3
100NMKT
GND
C9
C5
33p
GND
Input-selector
PFI
GND
U4
8,00000MHz
P32
P33
U5 MAX690
4
PFI
6
WDI
8
VBAT
C7
33p
100NMKT
S1
C8
100NMKT
Standby Tape-mMute
VOUT
PFO RES
VCC
C6
M
P35
P34
P31
S2
2 1
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
1 5 7
U3
Xtal EXtal MD1 MD0 NMI VCC STBY GND nc P40 P41 P42 P43 P44 P45 P46 P47
S3
2 1
9
P668P657P646P635P624P613P60
RES
S4
2 1
P5027P5128P5229P5330P5431P5532P7033P7134nc35P7236P7337P7438P75/WR39P76/RD40P7741VCC42P27
T7T2SC2240
T6T2SA970
P36
OPTO
R7
10K
T3 T2SC2240
GND
VCC
R8
R10
390R
390R
2nc1
68
P31
P32
P33
P34
P35
P36
P37
H8
VCC
IN1
VCC
T5 T2SC2240
P30
P3061P3162P3263P3364P3465P3566P3667P37
60
P10
59
P11
58
P12
57
P13
56
P14
55
P15
54
P16
53
P17
52
GND
51
nc
50
P20
49
P21
48
P22
47
P23
46
P24
45
P25
44
P26
H8/325 HD6413258CP10
43
GND
IN8 IN7 IN6 IN5 IN4 IN3 IN2
STB
M1M2
T4 T2SA970
CD
TAPE-M
CD-S
LD3 LD4 LD5 LD6 LD7
LD8 LD2
U2 ULN2804
1
IN1
2
IN2
3
IN3
4
IN4
5
IN5
6
IN6
7
IN7
8
IN8
TUNER
LINE1
LINE2
LINE3
MUTE
LD9
R11
390R
10
+24
IN1
OUT1
K
IN2
OUT2
IN3
OUT3
IN4
OUT4
IN5
OUT5
IN6
OUT6
IN7
OUT7
IN8
OUT8
GND
9
GND
GND
18
RL2
17
RL8
16
RL3
15
RL4
14
RL5
13
RL6
12
RL7
11
RL1
+24
PFI
1
R5
39K2
C4 100NMKT
R6
10K
GND
M
T8
T2SA970
U1 MC7805
R9
10K
Vin
T2SC2240
T1
R G
GND
2
GND
R4
10K
T2
T2SA970
STANDBY
LD1
R3
RL1
M1
RL7
M2
RL6
RL5
RL4
RL3
RL8
OPTO
GND
RL2
+24
3
100NMKT
CN1
18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
18PIN
VCC
C3
+
C2
390R
+5V
PCB 02601B-AS-SISW
1
21
SPHINX Project Two Mk2 Service Manual
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
22
SPHINX Project Two Mk2 Service Manual
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
23
SPHINX Project Two Mk2 Service Manual
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
24
SPHINX Project Two Mk2 Service Manual
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
25
SPHINX Project Two Mk2 Service Manual
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
26
SPHINX Project Two Mk2 Service Manual
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
27
SPHINX Project Two Mk2 Service Manual
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
28
SPHINX Project Two Mk2 Service Manual
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
29
SPHINX Project Two Mk2 Service Manual
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
30
SPHINX Project Two Mk2 Service Manual
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
31
SPHINX Project Two Mk2 Service Manual
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
32
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