Sanyo DP50747 Service Manual

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Sanyo DP50747 Service Manual Manual pdf 7 page image

— 5 —POWER FAILURE CIRCUITCheck the following if the unit is turned off by the powerfailure detector.1. Disconnect the AC power cord (120V AC line) for at least10 seconds.2. Connect a DC Voltmeter to the circuits shown below.3. Press the Power key and check for the proper voltagesupplies.4. If any of these voltages is low, the power failure detec-tor should turn the unit off within three seconds.5. Check all circuits shown below.Note: This unit is equipped with a Power Surge Protectionfeature included in the CPU. If power failure occursthree times within 15 minutes, the CPU will stop func-tioning automatically to help prevent secondarydamage. (TV will not turn on by pressing the powerkey.) To reset the operating programs within the CPU,disconnect the AC power cord for at least 10 seconds.This unit is equipped with a Power Failure Detector functionincluded in the CPU which checks for an abnormal condi-tion in the chassis power supplies.If, while the power is on, a failure is caused by any of thefollowing that results in a low voltage supply, the CPU willturn the unit off in 1.5 seconds to prevent further damage:• Failure within the power supply circuits.• A short circuit in the load side from the supply.1. Power Failure 1: Detected voltage failure for analogand digital circuits. (Connected to IC801 pin 32.)2. Power Failure 2: Not used on this model.(Connected to IC801 pin 36.)(Normal: High; Failure: Low)If, while the power is off, the power is switched on and anyof these failures remains uncorrected, the CPU will shut offthe power within three seconds.3214IC801 (CPU)D1602 6925D1651D160436Power FailPower OnPower Fail 22Power BoardSubMainD1640K6DD1631D1621IC16409VIC16305VIC162033VIC16103.3VDK8B12VQ803Q804