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This service manual provides service instructions for the PTV Models listed below. Service personnel should read this manual thoroughly before servicing these chassis. V20B CHASSIS VS-A50 WS-A48 WS-A55 WS-A65 This service manual includes: 1. Assembly and disassembly instructions for the front and rear cabinet Components. 2. Servicing of the Lenticular Screen and Fresnel Lens. 3. Servicing printed circuit boards (PCBs). 4. CRT replacement procedure. 5. Electrical adjustments. 6. Chip parts replacement procedures. 7. Circuit path diagrams. The parts list section of this service manual includes: 1. Cabinet and screen parts. 2. Electrical parts. Schematic and block diagrams of the above listed models are included in this service manual for better under- standing of the circuitry. PCB drawings are also included for easy location of parts and test points.

PART 2 SCHEMATIC DIAGRAMS Overall PCB Block Diagram ... 1 PCB-MAIN ... 2 PCB-POWER ... 3 PCB-TERMINAL (Input Switch) ... 4 PCB-TERMINAL (3DYC / Decoders ... 5 PCB-SIGNAL-1 (AV I/O) ... 6 PCB-SIGNAL-2 (MICRO) ... 7 PCB-SIGNAL-3 (VCJ) ... 8 PCB-SIGNAL- 4 (Convergence Generator ... 9 PCBs - FRONT / CONTROL / CRTs / PREAMP ... 10 PCB-2HDW-1 (Input) ... 11 PCB-2HDW-2 (Main) ... 12 PCB-2HDW-3 (Output) ... 13 PCB LAYOUT DIAGRAMS ... 14 Refer to PART 1 for: • Specifications • Safety Precautions • Disassembly • CRT Replacement • Electrical Adjustments • Parts List • Block Diagrams