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VSX-418-K
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CONTENTS
SAFETY INFORMATION ..........................................................................................................................................................2
1. SERVICE PRECAUTIONS ....................................................................................................................................................5
1.1 NOTES ON SOLDERING ...............................................................................................................................................5
1.2 AMPLIFIER FAILURE DIAGNOSIS FLOW CHART........................................................................................................5
2. SPECIFICATIONS .................................................................................................................................................................6
2.1 SPECIFICATIONS...........................................................................................................................................................6
2.2 PANEL FACILITIES .........................................................................................................................................................7
3. BASIC ITEMS FOR SERVICE.............................................................................................................................................12
3.1 CHECK POINTS AFTER SERVICING..........................................................................................................................12
3.2 PCB LOCATIONS .........................................................................................................................................................13
4. BLOCK BIAGRAM ...............................................................................................................................................................14
4.1 OVERALL WIRING CONNECTION DIAGRAM ............................................................................................................14
4.2 BLOCK DIAGRAM ........................................................................................................................................................16
4.3 DSP BLOCK DIAGRAM................................................................................................................................................18
5. DIAGNOSIS.........................................................................................................................................................................19
5.1 DIAGNOSIS FLOWCHART...........................................................................................................................................19
5.2 DETECTION CIRCUIT..................................................................................................................................................23
5.3 AMPLIFIER SYSTEM PROTECTION OPERATION SPECIFICATION .........................................................................25
6. SERVICE MODE .................................................................................................................................................................26
7. DISASSEMBLY....................................................................................................................................................................27
8. EACH SETTING AND ADJUSTMENT ................................................................................................................................29
9. EXPLODED VIEWS AND PARTS LIST...............................................................................................................................30
9.1 PACKING SECTION .....................................................................................................................................................30
9.2 EXTERIOR SECTION...................................................................................................................................................32
9.3 REAR PANEL SECTION...............................................................................................................................................34
9.4 FRONT PANEL SECTION ............................................................................................................................................36
10. SCHEMATIC DIAGRAM ....................................................................................................................................................38
10.1 MAIN ASSY (1/3) ........................................................................................................................................................38
10.2 MAIN ASSY (2/3) ........................................................................................................................................................40
10.3 MAIN ASSY (3/3) ........................................................................................................................................................42
10.4 DSP ASSY (1/2)..........................................................................................................................................................44
10.5 DSP ASSY (2/2)..........................................................................................................................................................46
10.6 POWER PACK (1/2) and TRANS2 ASSY ...................................................................................................................48
10.7 POWER PACK ASSY (2/2) .........................................................................................................................................50
10.8 5.1CH INPUT and TRANS3 ASSYS ...........................................................................................................................52
10.9 FRONT DISPLAY, ROTARY ENCODER, POWER KEY and JOG ASSYS .................................................................54
10.10 FRONT MINI JACK, DIGITAL INPUT, REGULATOR and HEAD PHONE ASSYS....................................................56
10.11 VIDEO and PRIMARY ASSYS..................................................................................................................................58
11. PCB CONNECTION DIAGRAM ........................................................................................................................................60
11.1 DSP ASSY ..................................................................................................................................................................61
11.2 MAIN ASSY ................................................................................................................................................................62
11.3 POWER PACK ASSY..................................................................................................................................................66
11.4 TRANS2 and TRANS3 ASSYS...................................................................................................................................70
11.5 5.1CH INPUT and HEAD PHONE ASSYS .................................................................................................................72
11.6 FRONT MINI JACK ASSY...........................................................................................................................................73
11.7 FRONT DISPLAY, ROTARY ENCODER, POWER KEY and JOG ASSYS .................................................................74
11.8 DIGITAL INPUT ASSY ................................................................................................................................................78
11.9 REGULATOR ASSY....................................................................................................................................................79
11.10 PRIMARY ASSY .......................................................................................................................................................80
11.11 VIDEO ASSY ............................................................................................................................................................82
12. ELECTRICAL PARTS LIST ...............................................................................................................................................83
