I bought this G-Shock DW-9000 with a 1659 module from a seller on E-bay a while ago because I liked the look of it and I had not got one in my collection of 'Shocks'. I liked it when I got it but I was surprised to see that it was gaining a full second a day!!! Amazingly enough, if it was a regular windup or automatic analogue watch we would probably accept it as a great watch an brag about it, but a quartz G-Shock, not way! Casio say that they accept no more than +-15 per month for accuracy, and this watch was gaining about 30 seconds a month, totally unacceptable.
I have read about regulating a quartz watch many times so I thought that I would give it a try in this watch, after all what I got to lose, it only cost me a few pounds.
I opened it up and found the trimmer capacitor screw but I had no way of knowing which way to turn it, so I tried anti-clockwise and left it for a few hours to see what happened. It turned out that I was right about the direction and after a few more tries I found the right spot. I put a small dot near the slot on the screw to help me with the fine adjustments.
After a few fine adjustments I have worn the watch now for three days and I would like to tell you how much it has lost or gained , unfortunately I can't because the amount is so small that I can't measure it. I used 'Time.is' to set it and I estimate that it has gained about one tenth of a second in that time.
I am really pleased with myself right now and all I can say is if you have a quartz watch going fast or slow the it might be worth you time having a go to fix it, its cheaper that taking it to a watch repairer and better than just throwing it away.