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Panasonic KX-TGA400b and KX-TGA200b keypad repair information

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The keypads in these phones have a 100% failure rate.
 Average life of the original is just 6-18 months!

Why?
It's very simple...
The button contacts are way too small!

Circuit board
contact size
6-7mm		 Conductive
keypad button
just 4mm

Original keypad contact size vs keypad size KX-TGA400b

If the original buttons were just 0.5mm smaller it would not work at all!  touching only the center half of the switch. That means the original button uses only 1/4 of a millimeter of it's total 4mm diameter!
Improved Keypad Comparison Vs Panasonic Keypad  


Our button contacts touch over 20 TIMES more surface area of the switch!

Membrane keypads such as the Perma-Pad™ and Pad-Mate™ do not significantly increase contact size.
Membrane keypads still reply on the known defective OEM keypad with small contacts.
The small contacts push down on the highly flexible membrane only in a small area.
We used membrane keypads only until our real improved rubber keypad was available.
At the time, there was no other choice.
It's certainly cheaper and if it was really better, we'd still be using a membrane!

 

 

Inside a KX-TGA400b
close-up of KX-TGA400b keypad circuit board

 The numbers 1-0, #, * use the circular contacts. The other buttons all use the rectangle contacts.

<------

 

 close-up of the KX-TGA400b number pad contacts

The GRAY circles represent the original conductive contact. These work fine for the rectangle areas, however with the circular buttons they contact the center just fine, but the outside area is barely touched. A little dirt or goo will start to effect the button very quickly.

The GREEN area shows our new contact pad.

 

 

You are not alone!
Basically every single KX-TGA200b and KX-TGA400b phone is having (or will soon have) one or both of the two major problems. A quick internet search will provide you with dozens of message forums where people are complaining about the defects in this phone design.

Bad keypad

  1. Oil leaks from the keypad every time you use it, clogging up the contacts inside.

  2. The circuit board is designed for 6mm diameter contacts but the keypads have 4mm diameter contacts. That is 33% too small... A HUGE mistake!  Even a tiny amount of oil or grime causes complete button failure.

 

 

Choppy Transmit
 
This very common problem cannot be heard on the phone that is broken.
It is usually intermittent. You won't realize it's happening until your callers complain.
Our exclusive improved RF shield stops this from happening. We install it in every phone we repair!


Won't Register, Disconnects, Loose connection to base etc..

  1. The call sounds fine to you but your caller gets static or can't understand you.

  2. This intermittent problem will only get worse and the only way you will know is IF you are told by the other party.

  3. Caused by high frequency signals bouncing back on itself creating an echo effect that disrupts the phones ability to transmit a clean digital signal.

  4. Strangely enough, this occurs more often in the newer designed phones that have fewer years of use (even new) making it a defect, not a failure from use or age.

We are the only company world wide installing a new RF shield in these phones
 that eliminates 95% of the current and future causes for this problem!

We have repaired plenty of phones previously fixed by other companies and the factory.
We have not seen any evidence that any other company has the experience or has
taken the time to discover a real lasting solution for this problem.

PLEASE NOTE: Choppy transmit cannot be heard on the phone that is broken. If all or most of your cordless phones have audio problems then you may have a problem with choppy transmit in the base unit. This would not effect outside calls using the base unit because there is no radio involved.

 

Take a close look at what a NEW keypad looks like after 1 year.

KX-TGA400b bad keypad covered in silicone oil

This is a picture of a KX-TGA400b keypad sent in for repair. It was purchased new just 1 year earlier at Staples.

We recently repaired a 6 month old Panasonic factory refurbished phone. The keypad was working... IF you hit the keys hard enough.
 

 

We just wanted to send along a HUGE "thank you" to Priority One Business Communications, Inc for making this product.

Five years ago we purchased for our small office the complete system, which included the base phone and eight KX-TGA400B portables. And ever since, due to the keypad problem, we've had nothing but trouble and lost productivity. The number "1" button was always the first to go, and sending phones back for "service" at $80-$150 only resulted in the problem coming back less than a year later. At one point, after discovering the root cause of the issue, I attempted using bits of aluminum foil to make better contact, and even purchased a $20 "keypad repair kit" to try and fix the problem. But under normal phone usage, the conductive material in the kit flaked off making the problem even worse.

I'm glad I ran across the P1BC store on eBay (and later the pb1c.com website). Otherwise we never would have known that all the stock keypads for this model phone are defective from the factory, and all that gunk you find sticking to the PCB comes from the flimsy material the factory used to make the stock keypads. Had we known that P1BC made this product, then we could have saved at least $400 sending these phones in to the Panasonic ServiCenter for “repairs”!  It’s any wonder why Panasonic didn’t just re-manufacturer the keypads in order to fix the problem (or else buy a quantity from you guys for their repair center).

Anyway, all of us here are relieved to finally finally FINALLY get this annoyance fixed once and for all. Thanks again!

With Kindest Regards,
Chris Balbontin

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