panasonic cordless phone

[Joe Irvine]

Hi All,
I have a Panasonic cordless phone in for repair with the following
fault.
The unit is about 2 years old and has a digital answering machine.
The problem is at switch on it displays E2 on the display for about a minute
and then goes to the normal screen.
The handset will not talk to the base unit at all.I have tried the handset
on another base and it is ok so the fault must be in the base.
You can do stuff all with the base and cannot record message.
Has anyone seen this before.
Cheers
Joe

 

[Chris Prestwich]

The model of the phones would help.

On Thu, 10 Jul 2003 20:17:03 +1000, "Joe Irvine"
<jirvine1@iinet.net.au> wrote:

Hi All,
I have a Panasonic cordless phone in for repair with the following
fault.

__ __ __ __ __
Regards, Chris
[spamblock used]

 

[John Kawecki]

model of phone is KX-TCM418ALW

CHEERS
JOE

"Chris Prestwich" <chrisso@melbpcREMOVEBLOCK.org.au> wrote in message
news:qcjqgvgesv0rpea7t6hru113nbv6ubb497@4ax.com...

The model of the phones would help.

On Thu, 10 Jul 2003 20:17:03 +1000, "Joe Irvine"
jirvine1@iinet.net.au> wrote:

Hi All,
I have a Panasonic cordless phone in for repair with the
following
fault.

__ __ __ __ __
Regards, Chris
[spamblock used]

 

[Rheilly Phoull]

You could try
ftp://ftp.qrz.ru/pub/hamradio/schemes/phone/panasonic/
Read the text file 'readme.txt' to get an idea of the model to file name
situation. I.e for the KX-T4046AL which is common in Oz the file is 408.zip


--
Regards ............... Rheilly Phoull

"Joe Irvine" <jirvine1@iinet.net.au> wrote in message
news:3f0d3d1e$0$23107$5a62ac22@freenews.iinet.net.au...

Hi All,
I have a Panasonic cordless phone in for repair with the
following
fault.
The unit is about 2 years old and has a digital answering machine.
The problem is at switch on it displays E2 on the display for about a
minute
and then goes to the normal screen.
The handset will not talk to the base unit at all.I have tried the handset
on another base and it is ok so the fault must be in the base.
You can do stuff all with the base and cannot record message.
Has anyone seen this before.
Cheers
Joe

 

[waxhead]

On Fri, 11 Jul 2003 15:05:15 +1000, John Kawecki wrote:

model of phone is KX-TCM418ALW



That's very interesting since I was about to post regarding exactly the

same model. Unfortunately I don't have any answers yet.

In the last 6 months 2 separate friends of mine have brought me faulty
Panasonic cordless phones, both the same model (KX-TCM418ALW - digital
answer phone etc of '99 vintage) and both with the same symptoms.

The symptoms were such that the handset would work fine first time off the
base unit, and would continue to work for multiple calls, provided it
wasn't returned to the base.  If the handset was returned to the base, it
would no longer function until it was left for a period of time (which
appeared to relate to a charge period).  It would then be useable again.

In both cases the rechargeable battery had been replaced, but this didn't
fix the problem.  The base unit appeared to be correctly charging the
handset (via a pulsed voltage) and the battery voltage was good. I'm
unsure if the handset or base is at fault. Your observation would suggest
the base.

In the first instance, I couldn't find what was wrong and told my friend
to get a quote to have it fixed by a Panasonic licensed repairer. The
repair cost them $80 (compared to an approx $230 replacement cost). This
time round it would be nice to be able to fix it myself!

Wax

 

[alex]

"waxhead" <me@myplace.com> wrote in message
news:3f0ea2d2@dnews.tpgi.com.au...

The symptoms were such that the handset would work fine first time off the
base unit, and would continue to work for multiple calls, provided it
wasn't returned to the base. If the handset was returned to the base, it
would no longer function until it was left for a period of time (which
appeared to relate to a charge period). It would then be useable again.

the handset is coded each time it is placed on the base unit, by the 3rd
charge contact, stick ur CRO on there and you'll see the coding pulse.
The TCM418's had many problems with the handset and base contacts.
If u look at them closely and see a little black dot on either of them, its
enough to cause
problems.

In both cases the rechargeable battery had been replaced, but this didn't
fix the problem. The base unit appeared to be correctly charging the
handset (via a pulsed voltage) and the battery voltage was good. I'm
unsure if the handset or base is at fault. Your observation would suggest
the base.

There is also a smc cap that goes bad in the base unit.
If u stick ur CRO on the third charge contact (coding contact)
and see that the coding pulse is all modulated garbage, then
I can guaruntee that this is the problem. I've repaired
hundreds of these all with the same fault. Unfortunately I have left
the service trade and cant recall which cap it is. sorry.

 

[Joe Irvine]

Thanks guys for all your help.
Wax, that is a common problem with this model.
Replace the three electrolytics in the base unit power supply near the main
switching transistor and this will cure your problem.
Let me know how you go.
Cheers
Joe
"alex" <alex10@ihug.com.au> wrote in message
news:bemp5f$ort$1@lust.ihug.co.nz...

"waxhead" <me@myplace.com> wrote in message
news:3f0ea2d2@dnews.tpgi.com.au...

The symptoms were such that the handset would work fine first time off
the
base unit, and would continue to work for multiple calls, provided it
wasn't returned to the base. If the handset was returned to the base, it
would no longer function until it was left for a period of time (which
appeared to relate to a charge period). It would then be useable again.

the handset is coded each time it is placed on the base unit, by the 3rd
charge contact, stick ur CRO on there and you'll see the coding pulse.
The TCM418's had many problems with the handset and base contacts.
If u look at them closely and see a little black dot on either of them,
its
enough to cause
problems.



In both cases the rechargeable battery had been replaced, but this
didn't
fix the problem. The base unit appeared to be correctly charging the
handset (via a pulsed voltage) and the battery voltage was good. I'm
unsure if the handset or base is at fault. Your observation would
suggest
the base.


There is also a smc cap that goes bad in the base unit.
If u stick ur CRO on the third charge contact (coding contact)
and see that the coding pulse is all modulated garbage, then
I can guaruntee that this is the problem. I've repaired
hundreds of these all with the same fault. Unfortunately I have left
the service trade and cant recall which cap it is. sorry.

 

[jrobbo]

I've got a different panasonic cordless phone, a KXTG2570, and it has
also been giving me an "out of range" error on the handset for the
last few days, even when it is right next to the base station.

It was working fine, then the suddenly, it has started with this
error, and I can't get it to work at all. The base station works fine.
I've tried cleaning the contacts on the base and on the handset, but
it made no difference.

Any sugestions?

Many thanks in advance

Regards

John

To reply via email, remove the spam block from my email address

 

[Chris Prestwich]

I've got a different panasonic cordless phone, a KXTG2570, and it has
also been giving me an "out of range" error on the handset for the
last few days, even when it is right next to the base station.

Mine did this too, same model. $70 repair and so I'm informed, a
common fault, and mine was just out of warranty too.

I tried two of the newer model and took both back faulty for a refund.

btw, the repairer gave a 1 month warranty on the repair, I complained
until they made it 3 month, wow!

It is now the last Panasonic item I'll buy.

__ __ __ __ __
Regards, Chris
[spamblock used]

 

[waxhead]

On Sat, 12 Jul 2003 19:01:35 +1000, Joe Irvine wrote:

Thanks guys for all your help.
Wax, that is a common problem with this model. Replace the three
electrolytics in the base unit power supply near the main switching
transistor and this will cure your problem. Let me know how you go.
Cheers
Joe


Thanks Joe, that worked a charm.  I ended up just replacing the 2 caps

immediately beside the large transistor and all is good again.  This
transistor appears to be set up as a linear voltage regulator.  It's
developing quite a bit of heat and I'm guessing this is why the caps
(partially) failed.  I say partially because the regulator was still
putting out around 9V.  I didn't suspect there was any power supply issue,
since the voltage looked good on my cheap multimeter.

the handset is coded each time it is placed on the base unit, by the
3rd charge contact,  stick ur CRO on there and you'll see the coding
pulse.

Obviously there was a lot of noise on the output that was effecting the
handset coding.

I tend to think the same problem will occur again sometime down the track,
as the transistor is still pretty hot.  There is darkening on the PCB from
previous heat.  The plug pack for the base is label 13.5V @ 400mA.
However the regulation is pretty poor - on no load the voltage is over 20V
and under load, charging the handset, the voltage is still about 16-17V,
so the linear regulator is dropping nearly half the power used by the
unit, across itself.

Maybe a small clip on heatsink and compound would help the situation?
Ideally the supply voltage should probably be a bit lower (eg at least
5V lower!).  Then there wouldn't be the same heat issue.

Cheers,
Wax

 

[Pussynuts]

Wax, yep spot on.The plugpack voltage is way too high.suggest earlier model
9V unit.Panasonic are too cheap and are also using this transistor to create
a voltage drop from 13.5V to 9V I have found that a modified heatsink from
an old philips tv works a treat and fits in quite well without too much
adjustment.Also found this fault appearing in a few Uniden models as well.
Cheers
Joe
"waxhead" <me@myplace.com> wrote in message
news:3f15178b@dnews.tpgi.com.au...

On Sat, 12 Jul 2003 19:01:35 +1000, Joe Irvine wrote:

Thanks guys for all your help.
Wax, that is a common problem with this model. Replace the three
electrolytics in the base unit power supply near the main switching
transistor and this will cure your problem. Let me know how you go.
Cheers
Joe


Thanks Joe, that worked a charm. I ended up just replacing the 2 caps
immediately beside the large transistor and all is good again. This
transistor appears to be set up as a linear voltage regulator. It's
developing quite a bit of heat and I'm guessing this is why the caps
(partially) failed. I say partially because the regulator was still
putting out around 9V. I didn't suspect there was any power supply issue,
since the voltage looked good on my cheap multimeter.


the handset is coded each time it is placed on the base unit, by the
3rd charge contact, stick ur CRO on there and you'll see the coding
pulse.

Obviously there was a lot of noise on the output that was effecting the
handset coding.

I tend to think the same problem will occur again sometime down the track,
as the transistor is still pretty hot. There is darkening on the PCB from
previous heat. The plug pack for the base is label 13.5V @ 400mA.
However the regulation is pretty poor - on no load the voltage is over 20V
and under load, charging the handset, the voltage is still about 16-17V,
so the linear regulator is dropping nearly half the power used by the
unit, across itself.

Maybe a small clip on heatsink and compound would help the situation?
Ideally the supply voltage should probably be a bit lower (eg at least
5V lower!). Then there wouldn't be the same heat issue.

Cheers,
Wax