1. NOTES ON SERVICE VISIT.........................................................................................................................................2

1.1 SAFETY INFORMATION .......................................................................................................................................2

1.2 QUICK REFERENCE UPON SERVICE VISIT.......................................................................................................6

1.3 JIGS LIST ..............................................................................................................................................................8

2. EXPLODED VIEWS AND PARTS LIST ......................................................................................................................10

2.1 PACKING SECTION ............................................................................................................................................10

2.2 REAR SECTION ..................................................................................................................................................12

2.3 FRONT SECTION................................................................................................................................................14

2.4 CHASSIS SECTION (1/2) ....................................................................................................................................16

2.5 CHASSIS SECTION (2/2) ....................................................................................................................................18

2.6 PANEL CHASSIS SECTION ................................................................................................................................20

2.7 MULTI BASE SECTION .......................................................................................................................................22

2.8 PDP SERVICE PANEL ASSY 427 (AWU1208) ...................................................................................................24

2.9 TABLE TOP STAND (PDP-4270XD and PDP-4270XA ONLY).............................................................................25

3. PCB PARTS LIST .......................................................................................................................................................26

4. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ......................................................................................................42

4.1 OVERALL WIRING DIAGRAM (1/2) ....................................................................................................................42

4.2 OVERALL WIRING DIAGRAM (2/2) ....................................................................................................................44

4.3 OVERALL BLOCK DIAGRAM (1/2) .....................................................................................................................46

4.4 OVERALL BLOCK DIAGRAM (2/2) .....................................................................................................................48

4.5 POWER SUPPLY UNIT........................................................................................................................................49

4.6 42 X DRIVE, SUS CLAMP 1 and SUS CLAMP 2 ASSYS ...................................................................................50

4.7 42 Y DRIVE ASSY ...............................................................................................................................................51

4.8 POWER SUPPLY BLOCK of 42 X DRIVE and 42 Y DRIVE ASSYS ...................................................................52

4.9 42 SCAN A and 42 SCAN B ASSYS ...................................................................................................................53

4.10 42 ADDRESS ASSY ..........................................................................................................................................54

4.11 42 DIGITAL ASSY ..............................................................................................................................................55

4.12 SIGNAL BLOCK DIAGRAM ...............................................................................................................................56

4.13 R07 DT ASSY (PDP-4270XD and PDP-427XD ONLY) .....................................................................................58

4.14 POWER SUPPLY BLOCK of MAIN ASSY .........................................................................................................59

4.15 42E AUDIO ASSY ..............................................................................................................................................60

4.16 POWER SUPPLY BLOCK of 42E AUDIO, LED IR and SIDE KEY ASSYS .......................................................61

4.17 VOLTAGES .........................................................................................................................................................62

4.18 WAVEFORMS ....................................................................................................................................................70

5. DIAGNOSIS ................................................................................................................................................................74

5.1 TROUBLE SHOOTING ........................................................................................................................................74

5.1.1 FLOWCHART OF FAILURE ANALYSIS FOR THE WHOLE UNIT ................................................................74

5.1.2 FLOWCHART OF FAILURE ANALYSIS FOR THE POWER SUPPLY UNIT .................................................76

5.1.3 FLOWCHART OF FAILURE ANALYSIS FOR THE DIGITAL ASSY ..............................................................77

5.1.4 FLOWCHART OF FAILURE ANALYSIS FOR THE DRIVE ASSY .................................................................78

5.1.5 FLOWCHART OF FAILURE ANALYSIS FOR THE MAIN ASSY ...................................................................82

5.1.6 FLOWCHART OF FAILURE ANALYSIS FOR THE VIDEO SYSTEM............................................................83

5.1.7 FLOWCHART OF FAILURE ANALYSIS FOR THE AUDIO SYSTEM ...........................................................90

5.2 DIAGNOSIS OF PD (POWER-DOWN)................................................................................................................93

5.2.1 BLOCK DIAGRAM OF THE POWER-DOWN SIGNAL..................................................................................93

5.2.2 DIAGNOSIS OF THE PD (POWER-DOWN) .................................................................................................94

5.3 DIAGNOSIS OF SD (SHUTDOWN).....................................................................................................................97

5.3.1 BLOCK DIAGRAM OF THE SHUTDOWN SIGNAL.......................................................................................97

5.3.2 SD (SHUTDOWN) DIAGNOSIS ....................................................................................................................98

5.4 INFORMATION ON SYMPTOMS THAT DO NOT CONSTITUTE FAILURE ........................................................99

6. DISASSEMBLY .........................................................................................................................................................100

6.1 PCB LOCATION.................................................................................................................................................100

Part No.

GEM1004

GED-008

Used to fan cleaning.

Refer to "2.4 CHASSIS SECTION (1/2).

PDP-427XD

Remarks