How do I restset my passcode

Have you tried to put more pressure on the cover?

For future users of this post, here are some videos on how to diagnose AC problems, any more AC Control problems such as the AC Control Head (Console) and Engine computer (ECM, PCM, BCM, etc) will need serious understanding of how the system works. Although every car is different, most systems are extremely similar in overall operations,

Get your loaner tools from Autozone such as pressure manifold set, vacuum pump if you need to empty the system and know how to properly service Freon without breaking your compressor or over-servicing, going slow is the name of this servicing game, use a temp gauge in the AC Vent to TOP OFF your system at 2000 RPM, when it keeps getting colder, ADD, when it starts to get warmer, STOP. go slow:

AC Hi and Low Pressure Switches with schematic, https://www.youtube.com/watch?v=tMi3VDkP...

AC Compressor Relay diagnosis, https://www.youtube.com/watch?v=Pg0GHd0s...

AC Compressor Relay diagnosis, https://www.youtube.com/watch?v=FQX200Ya...

AC Compressor Clutch diagnosis, https://www.youtube.com/watch?v=KTbmgjA0...

AC Compressor Clutch broken wire diagnosis, https://www.youtube.com/watch?v=c6_3et2s...

AC Compressor Clutch with schematic, https://www.youtube.com/watch?v=LuKdP6oj...

AC and Radiator 2 Speed Cooling Fans diagnosis, https://www.youtube.com/watch?v=Sqh43Uud...

AC Blower Motor Fan RESISTOR, may also have one in front, https://www.youtube.com/watch?v=caNyKbxc...

There are many inputs to allow an AC system to operate, these symptoms here are the most common and to dig deeper into a problem if one of these is not it, will take a schematic and a good understanding of how the system works, as Scanner Danner and others have shown, all you really need is a test light and a simple volt multimeter and some jumper wires, BEWARE.

A couple of things to pay attention to, when you turn on the AC System, does the idle go up on the engine, the computer is in control. Do your cooling fans all come on with AC System control, does your blower motor work on at least one speed, if the thermistor at the evaporator is bad, maybe the system will not turn on or it will turn off the system before it gets really cold. You need a minimum Freon pressure for the system to work, it also cannot get too high or it will turn off, diagnosing pressure problems is another animal separate from these electrical issues, dirt is your enemy in the condensor and evaporator and if something is too hot to touch, that is also not good.

Do not use STOP LEAKS but its ok to use a small amount of leak detector dye and don’t keep adding oil unless you know how much oil is in the system, and the correct type, which is not the same on all vehicles. Do not forget to do your visual inspections, wiggle wires test, feel along some wire harnesses to feel for a rubbed harness and wire that may be shorting to ground, listen for signs of problems, loud electric motors on fans or compressors going bad internally, or missing sounds when you expect to hear something and have fun, GOOD LUCK.

A general cleaning should fix you up, I second the vote.

I just sent the CLASSPAD to the main CASIO repair facility, they quoted me all 3 main parts and wanted to charge me replacement cost to put the 3 parts together, I was expecting a software issue or an actual fix, I told them to send it back unrepaired and I will buy the big T.I. Your calculator is less than $30 where I live at the Mall, its popular here for students who have extra money to get this model, its the biggest offered here locally, if you cant find a used unit or the other model the other person suggested then just replace it. I doubt CASIO will send you the screen alone???

Hi @angeltwayana ,

What is the problem with the display?

If it needs replacing unfortunately, I’ve been unable to find a replacement LCD screen. You may have better luck.

Given the cost of a new calculator it may be uneconomically viable to replace the screen even if you could find a replacement part.

If it’s just that a line may be missing in the display or certain sections of the display is not working, you could always try dis-assembling the calculator and inspect the display module connections to the systemboard in case it is a faulty connection that is causing the problem.

Always remove the power source or battery from electronic equipment before starting any repairs etc.

'''HP Printer Technical Support''' is a dedicated team only for Hp Printer Customer who seek technical support for their Hp printer.

Hi,'''HP Printer Technical Support''' is a dedicated team only for Hp Printer Customer who seek technical support for their Hp printer.

HP Printer Error 0xc19a0040 pops up when the print head seems missing, cannot be detected or incorrectly installed. To resolve this issue, please follow the guidelines as it is mentioned. Here are the steps-

Firstly, Switch on the HP Printer

Now disconnect the power cable and wait for at least 30 seconds.

Reconnect the power cable at the back of the printer

Now Turn On the printer and check, if it still not working they check the cartridge. Use the authentic one.

If the ink cartridges you are using are not compatible with the printer, then it shows an error message. To get a proper printer in quality working condition then use the genuine parts. Not using reliable one will cause HP Printer Error code 0xc19a0040.

Thanks it worked… GoodGood one