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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Help: New Casio Watch Battery, Lost 'Beep Alarm'
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 |
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New Casio Watch Battery, Lost 'Beep Alarm'
"John Blake" wrote in message ... 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 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. |
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New Casio Watch Battery, Lost 'Beep Alarm'
You may have lost a tiny spring which contacts the transducer
if it's on the back plate as mine is. Rus "Dave" wrote in message ... "John Blake" wrote in message ... 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. |
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New Casio Watch Battery, Lost 'Beep Alarm'
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" wrote in message ... 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 |
#5
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New Casio Watch Battery, Lost 'Beep Alarm'
"Dave" writes:
"John Blake" wrote in message ... 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. That's what is sounds like. Or, one of the little spring contacts is bent of or has fallen out. --- 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 at repairfaq.org. Thanks. |
#6
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Help: New Casio Watch Battery, Lost 'Beep Alarm'
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. 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 |
#7
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Help: New Casio Watch Battery, Lost 'Beep Alarm'
"John Blake" wrote in message
: 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. 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. 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 -- -------------------- Alan "A.J." Franzman Email: a.j.franzman at verizon dot net -------------------- |
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