My Casio Databank Watch is DEAD

Casio Databank Watch
NEW Casio Databank Watch

I bought this model in 1995 and although it has had several batteries and replacement straps it has lasted 18 years until this week when I noticed the digits had all gone off. A week before I noticed it had reset to a date in 1990. I don’t know why. I altered the date and time to correct it then, but now when I take out the battery and put it back the illuminating light stays on and some peculiar digits display or I get no digits. There is an AC (All Clear) button inside but operating it has little effect. This is something I have noticed before when I have changed the battery but I have usually got it to reset. This time it is proving really awkward and I feel it is time to change it for a new one.

This is the second model I had. The first had a real bulb in it to light it up. and was bought right back in the 1970’s and lasted until I got the second model. The second model had an electroluminescent back-light that glowed green. When they first cam out it was suggested they might not last for many years but in fact it has lasted all this time and outlasted the electronics of the watch.

Maybe it has succumbed to a Tin Whisker somewhere.

I have now bought a replacement (LEFT).

So far I am happy with it although the amber coloured LED back-light which emanates from the bottom left corner is reminiscent of the old pea grain bulb that I had in my very first Databank watch. The electroluminescent type in the second model gave a very even green glow.

 

 

Spilling Juice From Cartons or Tetra Paks®

Introduction

This post contains instructions on how to avoid spilling juice from cartons or a Tetra Pak®, with a rectangular cross-section, while opening or lifting them. It’s quite natural to grip cartons by the easiest method (the broad sides) while opening them, or lifting them when they’re still full, causing the contents to pour or squirt out inadvertently. Cartons with a square cross section are indifferent to the sides that are gripped when lifting or pouring.

Situation

You go to the refrigerator and take out a new cool carton of juice. You hold it firmly and take off the seal and juice spurts out at you and runs down the side of the carton, or you pick it up after removing the seal and juice pours out as you grip it. Before you’ve got it in a glass you’re in a mess. This is usually caused by the way you grip the carton. Continue reading “Spilling Juice From Cartons or Tetra Paks®”

Tin Whiskers in a Wireless Thermostat Receiver

Tin Whiskers are a crystalline growth made of the element tin.

Tin whiskers often form on lead free solder used to fix components to circuit boards since lead was banned.

They are in the form of a very thin straight hair with one end attached to the tin from which they are formed. In my case they have grown on a piece of tin plated steel used to screen electronic components which are part of a central heating wireless thermostat radio receiver. This receiver has developed an intermittent problem and doesn’t switch on my central heating when it should. I suspect there is an electrical fault which may be caused by a tin whisker growing inside the component screening box until it touched some electrical connection.

Since I have not completely dismantled the item to find out for sure I don’t know if that is correct but as you can see from the pictures the Tin Whiskers that I have found on the outside of the screening box (see featured image) are up to 2mm long. Although I already knew about Tin Whiskers these are the first I have seen in 50 years of handling electrical or electronic devices. I have used a USB connected microscope to photograph them but I have had a lot of difficulty. They are so thin they are hardly visible with a watchmakers eyeglass with 10x magnification. Continue reading “Tin Whiskers in a Wireless Thermostat Receiver”

Dyson Slim DC18 Undercarriage Repair

Introduction

This post gives a detailed description, with photos and reference to a Parts Diagram, of how to replace a Dyson Slim DC18 Undercarriage. The Undercarriage would require changing if part of it broke since parts cannot be obtained individually. I changed mine when the  Air Input Changeover Valve Actuator broke.

“Since I first published this article, in February 2013, I have had plenty of feedback from readers and I have gleaned information from statistical data which has encouraged me to improve it. So if you came here soon after I published it you should find better information now.” — Helpful Colin

Continue reading “Dyson Slim DC18 Undercarriage Repair”