Bose 502 a 502 b and 502 c manual rev 03

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2 CONTENTS Contents ......................................................................................................................................... 2-3 Safety Information ............................................................................................................................. 4 Warranty ............................................................................................................................................. 4 Specifications ................................................................................................................................ 5-7 502 ®A Array Specifications ............................................................................................................... 5 502B Bass Module Specifications ................................................................................................... 6 502C Controller Specifications .................................................................................................... 6-7 Electrostatic Discharge Sensitive (ESDS) Device Handling ......................................................... 8 Parts Lists and Exploded Views ...................................................................................................... 8 Parts List Notes ................................................................................................................................. 9 Packaging Part List, 502A Array (see Figure 1) ............................................................................ 10 Figure 1. 502A Array Packaging View ............................................................................................10 Packaging Part List, 502B Bass Box (see Figure 2) .................................................................... 11 Figure 2. 502B Bass Box Packaging Exploded View .....................................................................11 Packaging Part List, 502C Controller (see Figure 3) ................................................................... 12 Figure 3. 502C Controller Packaging View .....................................................................................12 Main Part List, 502A Array (see Figure 4) ..................................................................................... 13 Figure 4. 502A Array Exploded View ..............................................................................................14 Main Part List, 502B Bass Box (see Figures 5 and 6) ................................................................. 15 Figure 5. 502B Bass Box Exploded View .......................................................................................16 Figure 6. 502B Access Panel and Connector Views ......................................................................17 Main Part List, 502C Controller (chassis with removable front panel) (see Figure 7) ............. 18 Figure 7. 502C Controller Exploded View (removable front panel version) ....................................19 Main Part List, 502C Controller (one-piece chassis) (see Figure 8) ........................................... 20 Figure 8. 502C Controller Exploded View (one-piece chassis version) ..........................................20 Electrical Part Lists ................................................................................................................... 21-30 502C Controller Main PCB Assembly ...................................................................................... 21-30 Disassembly Procedures ............................................................................................................... 31 502A Array Procedures ............................................................................................................. 31-34 Figure 9. 502A Array Exploded View ..............................................................................................32 Figure 10. 502A Array Wiring Diagram ...........................................................................................33 502B Bass Module Procedures ............................................................................................... 34-35 502C Controller Disassembly Procedures ............................................................................. 35-36 Figure 11. 502B Bass Module Exploded View ................................................................................37 Figure 12. 502B Bass Module Connector and Access Panel .........................................................38 Figure 13. 502B Bass Module Wiring Diagrams ............................................................................39 Figure 14. 502C Controller Exploded View (removable front panel version) .................................40 Figure 15. 502C Controller Exploded View (one-piece chassis version) ........................................40 Test Procedures .............................................................................................................................. 41 502A Array Test Procedures ........................................................................................................... 41 Figure 16. XLR input pin assignment ............................................................................................41 502B Bass Module Test Procedures ....................................................................................... 41-42 502C Controller Test Procedures ............................................................................................ 42-44 Figure 17. Unbalanced Connections ..............................................................................................45 Figure 18. 502C Controller Back Panel (Barrier Strip Version Shown) ...........................................45 Accessory Kit Part Lists ........................................................................................................... 46-51 502A PSA-5 Stand Adapter Parts List (see Figure 19) ................................................................. 46 Figure 19. PSA-5 Stand Adapter Kit ...............................................................................................46 502A CSB-5A Suspension Bracket Kit Parts List (see Figure 20) .............................................. 47 Figure 20. CSB-5A Suspension Bracket Kit ...................................................................................47

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3 CONTENTS 502B CSB-5B Suspension Bracket Kit Parts List (see Figure 21) .............................................. 48 Figure 21. CSB-5B Suspension Bracket Kit ...................................................................................48 502A WBP-5 Bi-Pivot Bracket Kit Parts List (see Figure 22) ....................................................... 49 Figure 22. WBP-5 Bi-Pivot Bracket Kit ...........................................................................................49 502A WCB-5 U-Bracket Kit Parts List (see Figure 23) ................................................................. 50 Figure 23. WCB-5 U-Bracket Kit ....................................................................................................50 502A CVT-5 Transformer Assembly Kit Parts List (Figure 24) .................................................... 51 Figure 24. CVT-5 Exploded View and Packaging ...........................................................................51 Figure 25. CVT-5 Schematic ..........................................................................................................52 Theory of Operation .................................................................................................................. 53-55 502C Controller ............................................................................................................................... 53 1. Differential Input Stage ............................................................................................................... 53 2. Equalizer for High Frequency Outputs ..................................................................................... 53 3. Output mode switch, Low frequency level control, and Normal/Sum mode stage .............. 53 4. Equalizer for Low Frequency Outputs ...................................................................................... 53 5. Mode switch ................................................................................................................................ 53 6. Output stage ................................................................................................................................ 54 7. Power Supply .............................................................................................................................. 54 8. Turn On/Off Muting Circuit ......................................................................................................... 54 9. Troubleshooting Tips ............................................................................................................ 54-55 502C Controller EQ Curves ......................................................................................................56-61 Figure 26. Low Frequency EQ ........................................................................................................56 Figure 27. Low Frequency EQ ........................................................................................................56 Figure 28. Low Frequency EQ ........................................................................................................57 Figure 29. Low Frequency EQ ........................................................................................................57 Figure 30. High Frequency EQ .......................................................................................................58 Figure 31. High Frequency EQ .......................................................................................................58 Figure 32. High Frequency EQ .......................................................................................................59 Figure 33. High Frequency EQ .......................................................................................................59 Figure 34. High Frequency EQ .......................................................................................................60 Figure 35. High Frequency EQ .......................................................................................................60 Figure 36. High Frequency EQ .......................................................................................................61 Figure 37. 502C Controller Block Diagram .....................................................................................62 Service Manual Revision History ................................................................................................... 63