Mitsubishi Electronics WS-48513, WS-65513, WS-48613, WS-55513 manual Reset Circuitry

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we are not showing the details of the DM circuitry. Fig- ure 4-1shows only the DC supplies and Reset signal going to the DM module.

Reset Circuitry

Figure 4-2illustrates the Reset circuitry in more detail. The normal and Reset logic are shown in the diagram.

IC7C70 is the Reset IC. A Low from pin 1 resets the TV µPC. IC7C70 is a Watch Dog type of Reset IC that monitors the µPC’s operation. It has an internal counter that is continually reset by pulses from the µPC, input at pin 4 of the IC. If the µPC locks up, no pulses are generated. The counter reaches its maximum count and a reset pulse is output at pin 1 to reset the µPC.

4-2

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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 BackChapter Alignment Procedures Initial SetupOption 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 DataConvergence Adjustment Mode Activating the HD mode when no HD signal is availableConvergence 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-upTime Shift Recording Power Supplies Standby Power DistributionStandard Standby Supplies Time Shift Supply Power Distribution Switched Supplies Regulator Troubleshooting Power DistributionsFlashes-Stops-Flashes-Stops-etc If the LED does not flash Page Chapter Control Circuitry Basic µPC RequirementsReset Circuitry Input Command Circuitry Page Serial Data Lines ΜPC Parallel InputsAC-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 Chapter Troubleshooting Tips Using The Front Panel LEDReading the Error Codes NetCommandTM Control Problems DM Module CheckCRT Phosphor Protection