Question about Panasonic KX TC1402W Cordless Phone (KX-TC1402W)
My problem is that suddenly the phone didn't work anymore. A few months ago When I disconnected the AC adaptor and reconected it after a few minutes the unit worked, but if I used it with a call, after a few minutes the main unit (not the phone) turned off. and next It was impossible to turn on putting the phone on the main unit to replace the code. But now the phone can't find the main unit (the phone works, but the main unit can't link with it). Somenone told me that probably I have to resoldering the microprocessor in the main unit, but i'n not sure about that. Can you help me? Thanks.
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Posted on Jan 02, 2017
Sounds as you have a bad ballest. The ballest is the power supply that turns your lamp on. You can check your lamp by removing it and it should be clear and no broken pieces of glass. With the lamp removed install the cover and turn it on you should hear no noise and when the power light turns red you should see a LAMP red led blink every 5 seconds. If no noise then the lamp is bad. If you do hear noise you have a bad ballist. Hope this helps. Frank
Posted on Oct 09, 2007
SOURCE: SA HE200 Code F70 problem
The F70 error code is not for the replacement of a fuse. It is an error code for the microprocessor having trouble communicating.
Try leaving the unit unplugged overnight and then plug it back in again. This should clear that code.
If it does not clear the code, try doing a hard reset with the unit NOT PLUGGED IN.
You would need to use a small metal pick or small flathead screwdriver and use a jumper to ground the pick/screwdriver to the chassis of the unit. Then you slowly run that pick over each pin of the micro, thus grounding every pin one after the other. This way you are sure to ground out the reset pin.The unit must not be plugged in when you do this. It will clear all memory and settings.
Without having this unit in front of me to properly troubleshoot with the proper tools, anything told to you is only a guess. Unless the person advising you has direct experience working on these units, they can not possibly know the solution to this problem.
I work at an authorized Panasonic service center and have never seen one of these receivers with that code and all it needed was a fuse replaced.
I have seen them needing the microprocessor replaced, but that is not something you could do yourself without the very best soldering skills. The microprocessor is a surface mounted component with 80 pins and is a very difficult component to replace. You can see it on the display panel near the middle of the board.
That code is no guarentee that the micro is bad either. if it doesn't clear the code by the way I have told you above, it needs to be serviced. Like I said, nobody can troubleshoot the communication of the micro without an O-scope, schematics, and a very good knowledge of how they work.
I think the previous service center charged you for a fuse and all the did was a hard reset of the unit.
Let me know how you do with this solution and please do not rate it until we have had a chance to explore other options. I actually have repaired a couple of these before.
Posted on Jul 02, 2008
SOURCE: On my DMR-ES35 Panasonic after perfect operation for 18 months, I'm getting a NO READ message, on disks already recorded on this unit,and several new disks of different makes. The main sympton now is
Same problem. "NoREAD" after about 15 months of moderate usage. Cleaned laser eye thoroughly. Solution is a class action lawsuit against Panasonic.
Posted on Nov 08, 2008
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