Panasonic REV-1 Service Manual

8-5. Dew SensorIf excessive moisture or condensation is present inside the machine ( an internal humidity of morethan 98Yo)the unit will stop if running. Until the moisture level decreases only the Eject mode willoperate. To sense the humidity, a dew sensor is used. The sensor is a special variable resistor whichchange resistance with ambient humidity.The sensor ranges in resistance from about 5K ohm at 90Y0 humidity to about 50K omh at 98Y0humidity. Normally, the voltage across the sensor is low because of its low resistance.But if moisture condenses inside the unit, the SYSTEM CONTROL IC voltage of Dew terminalincreases to indicate a Dew condition.Tape Mode Dew sensor ON Dew sensor OFFPower Compulsory Power on Power offDew indication Indicate “d” and “UI O“ Normal indicationCylinder Rotating *1 stopOUT Key operation Not possible *2 PossibleCassette in immediately a cassette is Possibleejected after it goes tocassette down position.Power Compulsory Power on Power offDew indication Indication “d” and “UI O“ Normal indicationCylinder Rotating *1 stopIN Key operation Not possible *2 PossibleCassette condition A cassette goes to down Stand-by mode at STOP3position and is in stand-by position.mode.“1: When the cylinder locks in dew mode, it will be released until dew sensor is truned off.*2: The keys which do not relate to the tape running operation, are able to be used.Dew sensor on: During Dew formation is detected and 80 minutes after completion of Dewdetection.Dew sensor off: 80 minutes later after copmletion of Dew detection.41