Help: New Casio Watch Battery, Lost 'Beep Alarm'

J

John Blake

Guest
Any ideas what might have gone wrong in
reassembling a Casio F-91W digital watch (or
similar) after a 3-V cell change that's
making the audio transducer inaudible? The
LCD lamp-button works, as do other setting
buttons.

The alarm works, dislaying a blinking LCD
symbol when it activates, but no beeping
sound. THe usual beep when changing modes is
also missing. I'd like to know what to look
for if I take it apart again.

Thanks for your tips.

John
 
"John Blake" <jblake@banspam.com> wrote in message
news:3FBBDFA8.3010709@banspam.com...
Any ideas what might have gone wrong in
reassembling a Casio F-91W digital watch (or
similar) after a 3-V cell change that's
making the audio transducer inaudible? The
LCD lamp-button works, as do other setting
buttons.

The alarm works, dislaying a blinking LCD
symbol when it activates, but no beeping
sound. THe usual beep when changing modes is
also missing. I'd like to know what to look
for if I take it apart again.

Thanks for your tips.

John
Click to expand...
is the back on the correct war around? The transducer is part of a plate on
the back. If it is upside down, then no transducer.
 
You may have lost a tiny spring which contacts the transducer
if it's on the back plate as mine is.
Rus

"Dave" <stickthespamup@yourass.com> wrote in message
news:OjRub.5211$Q13.44846121@news-text.cableinet.net...
"John Blake" <jblake@banspam.com> wrote in message
news:3FBBDFA8.3010709@banspam.com...
Any ideas what might have gone wrong in
reassembling a Casio F-91W digital watch (or
similar) after a 3-V cell change that's
making the audio transducer inaudible?> > John


is the back on the correct war around? The transducer is part of a plate
on
the back. If it is upside down, then no transducer.
Click to expand...
 
Either you have the rear plate on backwards, and or you lost the contact
spring. If you lost any parts, casio is easy to get in touch with and
purchase parts.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"John Blake" <jblake@banspam.com> wrote in message
news:3FBBDFA8.3010709@banspam.com...
Any ideas what might have gone wrong in
reassembling a Casio F-91W digital watch (or
similar) after a 3-V cell change that's
making the audio transducer inaudible? The
LCD lamp-button works, as do other setting
buttons.

The alarm works, dislaying a blinking LCD
symbol when it activates, but no beeping
sound. THe usual beep when changing modes is
also missing. I'd like to know what to look
for if I take it apart again.

Thanks for your tips.

John
 
"Dave" <stickthespamup@yourass.com> writes:

"John Blake" <jblake@banspam.com> wrote in message
news:3FBBDFA8.3010709@banspam.com...
Any ideas what might have gone wrong in
reassembling a Casio F-91W digital watch (or
similar) after a 3-V cell change that's
making the audio transducer inaudible? The
LCD lamp-button works, as do other setting
buttons.

The alarm works, dislaying a blinking LCD
symbol when it activates, but no beeping
sound. THe usual beep when changing modes is
also missing. I'd like to know what to look
for if I take it apart again.

is the back on the correct war around? The transducer is part of a plate on
the back. If it is upside down, then no transducer.
Click to expand...
That's what is sounds like. Or, one of the little spring contacts is
bent of or has fallen out.

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Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.
 
John Blake wrote:

Any ideas what might have gone wrong in reassembling a Casio F-91W
digital watch (or similar) after a 3-V cell change that's making the
audio transducer inaudible? The LCD lamp-button works, as do other
setting buttons.

The alarm works, dislaying a blinking LCD symbol when it activates, but
no beeping sound. THe usual beep when changing modes is also missing.
I'd like to know what to look for if I take it apart again.

Thanks for your tips.

John
Click to expand...
Many thanks for the replies. Don't think I
left out a spring. But there was a bent-up
tab on the back plate (not the screw-on rear
case plate), located just above a tiny
metallic cylinder that I suspected might be
the transducer.

Initially I tried installing the back plate
180 degrees twisted until I saw the the
Casio's 3 push buttons didn't match the three
grooves on the watch 'chassis'.

Also, the original cell had a tiny piece of
black insulating tape on it (sticky both
sides), located just above the transducer. I
didn't put any replacement tape on the new
cell, thinking it might have been just to
hold the cell still during assembly. The back
of the watch chassis had a piece of white
tape on its back, and I substituted clear
Scotch tape when I reassembled it.
John
 
"John Blake" <jblake@banspam.com> wrote in message
<news:3FBC0B69.8050307@banspam.com>:
John Blake wrote:

Any ideas what might have gone wrong in reassembling a Casio F-91W
digital watch (or similar) after a 3-V cell change that's making the
audio transducer inaudible? The LCD lamp-button works, as do other
setting buttons.

The alarm works, dislaying a blinking LCD symbol when it activates, but
no beeping sound. THe usual beep when changing modes is also missing.
I'd like to know what to look for if I take it apart again.

Thanks for your tips.

John


Many thanks for the replies. Don't think I
left out a spring.
Click to expand...
These springs are usually quite tiny and can fly out as the back is removed,
in which case you might never have had a chance to see it!

But there was a bent-up
tab on the back plate (not the screw-on rear
case plate), located just above a tiny
metallic cylinder that I suspected might be
the transducer.
Click to expand...
The metallic cylinder is probably the quartz crystal, the watch's main
timekeeping component. The "transducer" is usually a thin piezoelectric
element laminated directly to the inner side of the case back. There will
typically be a dull silver-colored conductive coating on the surface, which
shows marks readily. If the case back has been removed and replaced properly
a few times, there should be an obvious place where electrical contact was
made. Also, there must be a second connection to this piezo element through
the case back itself, which may be made near an edge away from the element, or
with metal-cased watches, via the case.

Initially I tried installing the back plate
180 degrees twisted until I saw the the
Casio's 3 push buttons didn't match the three
grooves on the watch 'chassis'.

Also, the original cell had a tiny piece of
black insulating tape on it (sticky both
sides), located just above the transducer. I
didn't put any replacement tape on the new
cell, thinking it might have been just to
hold the cell still during assembly. The back
of the watch chassis had a piece of white
tape on its back, and I substituted clear
Scotch tape when I reassembled it.
John
Click to expand...
--
--------------------

Alan "A.J." Franzman

Email: a.j.franzman at verizon dot net

--------------------
 
John Blake wrote:
The alarm works, dislaying a blinking LCD
symbol when it activates, but no beeping
sound.
Click to expand...
The last time I had that happen, the new battery was bad. It had just
enough power to run the clock and display, but when the buzzer tried to
sound, it drew enough power to disappear the display in blinking fashion.

In my experience it's not unusual to get a brand-new battery that's dead.

--
"Look, we have exhausted virtually all our diplomatic effort to get the Iraqis
to comply with their own agreements and with international law. Given that,
what other option is there but to force them to do so?"
-- Tom Daschle, Feb. 11, 1998
 
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