The pictures above are from a Seiko electronic wall clock that stopped running. The cause was dust and dirt over a number of years built up, and stopped the gears from operating. You will need a good magnifying glass to see it. I used a 10 power glass, but any good glass will show the problem. Cleaning the gears with a tiny brush can remove the dust. Isopropyl alcohol may be used to clean the contacts. Be sure to take lots of pictures prior to, and during disassembly. I found some of these electronic clocks can be complicated, and not easy to take apart and put back together.
The above picture shows some of the timing circuit. The round gold contacts are part of the clock mechanism that lets it chime every hour. The square black object on the PC board is an integrated circuit, and is a part of the quartz oscillator circuit. Most of these quartz clocks oscillate at 32,760 Hz. This happens to be 2 to the 15th power.
SMALL TABLE CLOCK
Below is a small quartz table clock with a snap-in clock module. The snap-in movements are 56mm x 56mm (about 2 1/4″) and snap into the case below. Some of the variables in replacing these movements are: getting the correct extension for the hands and the correct hand lengths. Many replacement movements come with hands, which may be useful. Take careful measurements! A metric ruler is helpful.
Why this clock failed!
Look at the upper left battery contact. The middle of the contact surface is worn away from replacing batteries over its life. I repaired it by soldering over both contact areas, using a low heat setting on my soldering iron. The cylindrical object in the middle of the circuit board is the quartz crystal; this provides timing to the stepper motor on the other side of the circuit board. The large black dot next to the crystal is an integrated circuit, probably like a 555 timer IC. Not all quartz clocks can be saved, but this one was..
New movements may be be purchased online. Be sure to take careful measurements, as they come in many sizes, especially where the clock hands are concerned. I was fortunate to save this one. My wife liked this clock.
SLO-ELECTRONICS 