REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Saturday 9 February 2019

FISHER & PAYKEL _ DEIX1 AA WW _ INTUITIVE DRYER _ HEATER CONTROL & AUTO SENSING - PRINCIPLES

FISHER & PAYKEL _ DEIX1 AA WW _ INTUITIVE DRYER _ HEATER CONTROL & AUTO SENSING - PRINCIPLES





HEATER CONTROL


  • The heaters are controlled in response to the selected drying cycle chosen and also according to other operational requirements such as reversing and over heating.
  • The heater housing is fitted with two elements that supply approximately 5 kW of heat when both are on. There is a 3.6kW and a 1.4Kw element that are used at various times depending on the cycle chosen and the drum/fan direction.
  •   When drying, the heater is only switched on when the drum is up to speed. Because of the time it takes for the element to cool down after switching off, the larger element in the electric model is switched off a few seconds before stopping to reverse, to prevent excessive heat entering the drum.
  • The software in the motor control module responds to the switching on and off of the heater as requested by the sensor module. It also monitors the automatic thermostat on the heater housing for excessive restriction of airflow, and if detected, will set a User Warning but continue the drying cycle until the end of the cycle when the warning will reset. If the User Warning occurs, the drying will take a longer time to complete and the load will possibly end up a little damp.
  • Each cycle has a temperature limit, as measured in the exhaust air. After switching off at the limit, the temperature has a hysteresis of 5 degrees below these temperatures when the heat source switches back on.  Note: During heating, if the temperature exceeds the limits for the particular cycle, the heat is turned off and can significantly reduce the heating time.

Cycle times can be affected by a number of factors including:
  • The cycle chosen
  • Load size
  • Size of items
  • Type of fabric
  • Load wetness
  • Venting method
  • Location of dryer
  • Condition of exhaust ducts
  • Environmental conditions (temperature, humidity, etc)


AUTO SENSING

  When wet or damp clothes are loaded into a dryer they are partially saturated with water which is a relatively good conductor of electricity. In the IntuitiveTM dryer, sensor bars (located beneath the lint bucket) are used to measure the conductivity. When moisture in the clothes touches across the
sensor bars their conduction is measured. As the clothes dry they become less conductive and it is this measurement that is used to calculate the dryness of the clothes load.


  Large loads will brush against these sensor bars more frequently than small loads, and this strike count is used to help determine the dryness of different sized loads.

  Different fabrics retain moisture differently; a thick towel containing a lot of moisture will often conduct the same as a light synthetic garment containing very little. It is this difference in fabric characteristics plus the initial unknown moisture content that makes the calculation of dryness reasonably complex.
Posted By: FRANK at 01:25
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