SPHINX
Project Eight Service Manual
2
1. UNPACKING .......................................................................................................................................3
2. SPHINX WARRANTY CARD ..............................................................................................................3
3. CONTACTING THE MANUFACTURER .............................................................................................3
4. TECHNICAL SPECIFICATIONS .........................................................................................................4
5. GENERAL CHECKLIST......................................................................................................................5
Serial number and software version ............................................................................................................ 5
Input functions ............................................................................................................................................. 5
Channel imbalance ...................................................................................................................................... 5
Remote Control............................................................................................................................................ 5
6. SPHINX REMOTE CONTROL ............................................................................................................6
Buttons and LED indication ......................................................................................................................... 6
Operation ..................................................................................................................................................... 7
Selecting without switching .......................................................................................................................... 7
'Learning' the commands ............................................................................................................................. 7
Changing a command.................................................................................................................................. 7
Erasing all commands of one component.................................................................................................... 7
The LED during Normal mode ..................................................................................................................... 8
The LED during 'Learn' mode ...................................................................................................................... 8
Batteries....................................................................................................................................................... 8
Other things worth knowing... ...................................................................................................................... 8
Encountering problems... ............................................................................................................................. 8
7. MEASUREMENTS ..............................................................................................................................9
General set-up ............................................................................................................................................. 9
Necessary Equipment.................................................................................................................................. 9
Audio signal distortion measurement........................................................................................................... 9
Set-up .......................................................................................................................................................... 9
8. OUTPUT DC-OFFSET ADJUSTMENT.............................................................................................10
Set-up ........................................................................................................................................................ 10
Adjustment ................................................................................................................................................. 10
9. PROBLEMS AND SOLUTIONS........................................................................................................11
10. DIAGRAMS AND PARTS LISTS ....................................................................................................12
Figure 1: Front panel ................................................................................................................................. 12
Figure 2: Rear panel .................................................................................................................................. 12
Index of diagrams and drawings ................................................................................................................ 13
Figure 3: Connection Diagram for testing the Project Eight....................................................................... 14
Figure 4: Display Board Schematic Layout................................................................................................ 15
Figure 5: Construction Drawing for top cover plate.................................................................................... 16
Figure 6: Schematic Operational Diagram Project Eight ........................................................................... 17
Figure 7: Schematic Overview of all relevant potentiometers .................................................................... 18
Figure 8: Disamp-96 .................................................................................................................................. 19
Figure 9: Functional Schematic ................................................................................................................. 20
Figure 10: Left Power Supply..................................................................................................................... 21
Figure 11: Right Power Supply .................................................................................................................. 22
Figure 12: Input/Output .............................................................................................................................. 23
Figure 13: Left Volume Control .................................................................................................................. 24
Figure 14: Right Volume Control................................................................................................................ 25
Figure 15: Left Output Amp........................................................................................................................ 26
Figure 16: Right Output Amp ..................................................................................................................... 27
Figure 17: Left Input Amp .......................................................................................................................... 28
Figure 18: Right Input Amp ........................................................................................................................ 29
Figure 19: Power Supply Unit .................................................................................................................... 30
Figure 20: PCB drawings ........................................................................................................................... 31
Parts List .................................................................................................................................................... 32
