Touch tone phone repair

B

Bill 2

Guest
I'm trying to restore an old desk Nortel touch tone phone. The problem is
that all the tones are lower pitched than what they should be. This is true
for both horizontal, and vertical tones. Is there anything I should look
for?
 
"Bill 2" <asdf@asdf.com> writes:

I'm trying to restore an old desk Nortel touch tone phone. The problem is
that all the tones are lower pitched than what they should be. This is true
for both horizontal, and vertical tones. Is there anything I should look
for?
Click to expand...
On old ATT touch tone phones, this usually meant one of the pot cores
had come unglued.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the feedback form on the S.E.R FAQ Web sites.
 
"Sam Goldwasser" <sam@saul.cis.upenn.edu> wrote in message
news:6wy8pv37aj.fsf@saul.cis.upenn.edu...
"Bill 2" <asdf@asdf.com> writes:

I'm trying to restore an old desk Nortel touch tone phone. The problem
is
that all the tones are lower pitched than what they should be. This is
true
for both horizontal, and vertical tones. Is there anything I should look
for?

On old ATT touch tone phones, this usually meant one of the pot cores
had come unglued.
Click to expand...
By the pot cores I assume you mean the two transformer like things on the
back of the keypad? They seemed to be glues securely in place, and I tried
prodding at them while dialing and it is still to low of pitched. If I'm
correct one is used for horizontal and one use for vertical tones right?
Because they are both off by the same amount. Is there any way to adjust
them?
 
Sam Goldwasser (sam@saul.cis.upenn.edu) writes:
"Bill 2" <asdf@asdf.com> writes:

I'm trying to restore an old desk Nortel touch tone phone. The problem is
that all the tones are lower pitched than what they should be. This is true
for both horizontal, and vertical tones. Is there anything I should look
for?

On old ATT touch tone phones, this usually meant one of the pot cores
had come unglued.

It's probably worth adding that it was common (or universal) in those
Click to expand...
pre-IC touchtone phones to use a single transistor for both tones.
It was oscillating on two different frequencies. So there is
something common to the oscillator that is causing the problem, when
someone unware of the odd oscillator might be seeking the cause beyond
the actual oscillator.

Michael
 
"Bill 2" <asdf@asdf.com> writes:

"Sam Goldwasser" <sam@saul.cis.upenn.edu> wrote in message
news:6wy8pv37aj.fsf@saul.cis.upenn.edu...
"Bill 2" <asdf@asdf.com> writes:

I'm trying to restore an old desk Nortel touch tone phone. The problem
is
that all the tones are lower pitched than what they should be. This is
true
for both horizontal, and vertical tones. Is there anything I should look
for?

On old ATT touch tone phones, this usually meant one of the pot cores
had come unglued.

By the pot cores I assume you mean the two transformer like things on the
Click to expand...
Correct.

back of the keypad? They seemed to be glues securely in place, and I tried
prodding at them while dialing and it is still to low of pitched. If I'm
correct one is used for horizontal and one use for vertical tones right?
Because they are both off by the same amount. Is there any way to adjust
them?
Click to expand...
If they are both off, then it's not the pot cores. And, this doesn't
sound like an adjustment, but a component failure or one way out of
tolerance.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the feedback form on the S.E.R FAQ Web sites.
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top