Mitsubishi Electronics WS-65513, WS-48613, WS-48513, WS-55513 Standard Standby Supply, Start-up

Page 34

Standard Standby Supply

The Standard Standby Regulator circuit is shown in Fig- ure 3-5.

Start-up

The Start-up Voltage Supply is from R9A18 in the Low Energy Mode circuit, refer to Figure 3-2. The SUB- POWER command from the Control Circuitry activates the Standby Supply.

When SUB-POWER goes High:

•Q9A09 conducts, activating a Photo Coupler in PC9A20.

•The Photo Coupler turns Q9A12 On, supplying start-up voltage to pin 4 of IC9A20.

•When oscillation starts, the signal from pin 2 of T9A20 is rectified by D9A22 and added to the start-up voltage to maintain oscillation.

Regulation

The secondary 12VS supply is monitored for regula- tion. A sample of the 12VS is compared to a reference in IC9A21. A correction voltage from IC9A21 con- trols a second Optical Coupler in PC9A20.

The output of the Optical Coupler is applied to pin 5 of IC9A20, controlling the PWM of the oscillator's signal.

3-4

Image 34

Contents V23 Page 2003 Page Alignment Procedures Table of Contents Introduction ... New TechnologiesDisassembly and Service Power SupplySync, Deflection and High Voltage Troubleshooting TipsVideo/Color Circuitry Convergence CircuitryFeatures IntroductionFeatures NetCommand NetCommand IconsFormat Memory Card Reader Button FunctionPerfectColor CompatibilityMonitorLink Digital Visual Interface DVITransition Minimized Differential Signaling Tmds AcronymsSingle-Link Tmds Display Data Channel DDCHigh-bandwidth Digital Content Protection Hdcp Hot Plug Detect HPDMonitorLink DVI Connector DVI Input Block DiagramV23 Chassis DVI Input Block Diagram Service Menu Access Codes Chapter Disassembly and Service LightboxDM Replacement Main Chassis RemovalMain Chassis Removal PCB Locations Convergence IC Replacement PCB & Major Component LocationsV23+++ Cabinet Front Disassembly V23+++ Composite Cabinet BackInitial Setup Chapter Alignment ProceduresOption Menu Initial Setup Main Menu Default Settings Circuit Adjustment Mode Activating the Circuit Adjustment ModeNEW FEATURE… Service Mode Reset Selection of adjustment Functions Adjustment ItemsTerminating the Circuit Adjustment Mode Saving Adjustment DataActivating the HD mode when no HD signal is available Convergence Adjustment ModeConvergence Mode Functions Fine Convergence Mode Alignment Data Storage LocationsLow Energy Mode Activation Chapter Power SupplyLow Energy Mode Low Energy Standby RegulatorUser Setup Menu RegulationLow Energy Power Distribution Standard Standby Supply Start-upStandby Power Distribution Time Shift Recording Power SuppliesStandard Standby Supplies Time Shift Supply Power Distribution Switched Supplies Regulator Power Distributions TroubleshootingFlashes-Stops-Flashes-Stops-etc If the LED does not flash Page Chapter Control Circuitry Basic µPC RequirementsReset Circuitry Input Command Circuitry Page ΜPC Parallel Inputs Serial Data LinesAC-OFF Input Short Detect RAY ProtectParallel Outputs BWC Band Width ControlFlash Circuit Chapter Video/Color Circuitry PCB-TERMINAL Video Path PCB-SIGNAL Video Path CRT Drive & Protect Circuitry Digital Signal Path Monitor Out Circuit Chapter Sync, Deflection & High Voltage Sync Signal Path VGAPage Page Vertical Deflection Horizontal DeflectionHorizontal Deflection DC Supply Circuitry Deflection Loss Detection HV & HV Regulation Ray Protect Page Convergence Circuitry Overall Block Diagram Chapter Convergence CircuitryWaveform Generator & D/A Converter Convergence Waveform Generator & D/A ConverterLPF & Summing Amps Low Pass Filter and Summing AmplifiersConvergence Output Circuitry Convergence Output CircuitryChapter Sound Circuitry DTV DVI VGAOverall Sound Circuitry Block Diagram Overall Sound Signal Path Digital Audio OutputPage Using The Front Panel LED Chapter Troubleshooting TipsReading the Error Codes DM Module Check NetCommandTM Control ProblemsCRT Phosphor Protection