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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

2
SPHINX Project Two Mk2 Service Manual

The Sphinx Project Two Mk2 design principles 1. UNPACKING
Before leaving the factory every Project Two Mk2 is
The Sphinx Project Two Mk2 was designed for the
subjected to stringent and extensive technical and
ever-increasing group of quality-conscious
exterior quality inspection. This ensures the user
audiophiles.
many years of high quality audio from a perfect-
We are very proud of the tradition connected with
looking product.
the SPHINX name, especially concerning audio
We recommend owners to ship the Project Two
quality perfection.
Mk2 in its original carton.
This service manual will help you to optimally
After unpacking the Project Two Mk2 we therefore
service and repair the Sphinx Project Two Mk2 Pre-
recommend you carefully check it for any transport
Amp.
damage.
This pre-amp is extremely simple to operate and
If you find any damage and the product has not
uses the newest technologies and refined designs.
been shipped in the original carton the ensuring
Designs that have successfully been used in the
repair costs will not be covered by the warranty.
award winning Project Eight.
Features include ultra-linear extremely low-noise
Class A audio circuits, built from the finest hand-
selected parts.
The signal path is completely balanced from input to 2. SPHINX WARRANTY CARD
output, and left and right are totally separated. To be entitled to any warranty repairs the owner
The power supply is of a unique design (fully Class- must have send the filled out warranty card to
A!) and consists of three completely separate and Sphinx or a distributor where it has been registered.
independent sections: one for the digital control plus Other regulations may apply in your specific
one each for the left and right channel. country: when in doubt, please consult the proper
The ALPS volume control is motor-controlled. authorities.
All settings and controls can also be accessed from
the supplied Sphinx Remote Control.

To obtain the maximum quality from this pre amp it
3. CONTACTING THE MANUFACTURER
is necessary for it to be properly aligned and to be
used with top quality audio components, preferably In case of any problem not covered in this manual
other Sphinx components. 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:
Please also refer to the User Manual of the
Project Two Mk2 for information about Telephone (+31) 35 602 0302
functions not described in this manual. Fax (+31) 35 602 2806
It is important to familiarise yourself with the E-mail [email protected]
special functions, operation and possibilities
of the Sphinx Project Two Mk2. It is always very helpful and efficient if you have all
relevant information about the specific product and
the problem ready.

3
SPHINX Project Two Mk2 Service Manual

4. THE PRE-AMP AT A GLANCE

Front panel
3 5
1

1 2 4 6 7 8

1. INPUT: With this rotary knob you may select 5. MUTE: Press this button to temporarily mute
one of the six inputs. the sound. The red LED will light.
Turn clockwise for an input to the right of the
6. TAPE MON: To select the TAPE IN input. The
active one, anti-clockwise for an input to the
left. red LED will light.
7. PHONES: To connect dynamic stereo
2. STANDBY: To switch the component on and headphones.
off: 8. VOLUME: This rotary knob adjusts the volume
on LED is green level.
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.

4
SPHINX Project Two Mk2 Service Manual

Rear panel

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

9. GROUND: You may directly connect the signal 19. BALANCED OUT L: To connect the XLR
grounds of other equipment to the signal signal cable (balanced cable) from the left input
ground of the Project Two Mk2. of the power amp.
10. TAPE OUT: Connect this output to the input of 20. BALANCED OUT R: To connect the XLR
the recorder. signal cable (balanced cable) from the right
input of the power amp.
11. TAPE IN: Connect this input to the output of
the recorder. 21. OUT 1 L+R: Connect this output with a cinch
signal cable to the input of your power amp.
12. CD: To connect the cinch signal cable from the
CD player. 22. OUT 2 L+R: To connect the XLR signal cable
(balanced cable) from the right input of the
13. TUNER: To connect the cinch signal cable from
extra power amp or surround processor.
the tuner.
23. Control Out: To connect the optical cable
14. LINE 1: To connect the cinch signal cable from
going to another Sphinx component.
the signal source for LINE 1.
24. Warning!: This shows important information
15. LINE 2: To connect the cinch signal cable from
about the safety regulations for the
the signal source for LINE 2. Project Two Mk2.
16. LINE 3: To connect the cinch signal cable from
the signal source for LINE 3. 25. AC Power: Connect the mains cable to a
17. CD BALANCED L: To connect the XLR signal mains power outlet (230 - 240 VAC).
cable (balanced cable) from the left output of 26. O / I: This is the mains power switch.
the CD player.
27. Fuse holder: Contains a fuse (500 mA slow).
18. CD BALANCED R: To connect the XLR signal
cable (balanced cable) from the right output of 28. Selector for power supply voltage (120/240
the CD player. V), (115/230 V).

5
SPHINX Project Two Mk2 Service Manual
5. OPERATION
Connect the mains cable to a mains outlet.
Selecting an input
Once you have finished connecting all components, You select the input with the large rotary knob
you can power on the Project Two Mk2 with the INPUT:
mains switch O / I (26.). clockwise to the right of the selected one,
anti-clockwise to the left of the selected one.
The volume control will then automatically turn Upon reaching LINE 3 or CD SYM you cannot 'roll
counter-clockwise and, for a while, the STANDBY over' to CD SYM or LINE 3 respectively.
LED will blink red/green, after which it will remain
red. As long as you move the knob, only the LED's will
The pre-amp is now in standby mode. change: the current selected input remains active.
The new input only becomes active after you have
Power on selected it and released the INPUT knob.
You will hear a 'click'. This is caused by the precision
You switch the amp on with the STANDBY button. relays for the inputs: the 'old' one is released while
That way, all circuits will remain at optimum the new one is energised.
operating temperatures and the audio quality will be
100% immediately after switching on. Additionally it
significantly increases the life span of the
Adjusting the volume level
component. The large VOLUME control to the right adjusts the
volume level from OFF to maximum (fully clockwise).
The pre-amp will select the CD SYM input after The level change is immediate.
which it un-mutes the output.
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.).

6
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.