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The battery replacement for the Jia Heng Butane Lighter Watch is fairly easy. The clock face actually gets removed from the lighter body. The only tools you will need are jewelers Phillips and slotted screwdrivers; Phillips and slotted.
Remove band by compressing spring pin with slotted screwdriver by pushing in the pin. These are standard watch band pins.Remove back 4 screws to remove backThe clock face is help on by 2 screws removed from the open back, there are at the 11 and 4 o'clock orientation when looking at the back.The front will drop off.Remove the plastic alignment spacer.Replace the 377 button battery.Put it back together by reversing the process.
Attached pictures Front Back Clock face screws Plastic alignment spacer Battery placement
If your watch is changing date before midnight (12 hours earlier as it should) - Pull out crown and turn watch hands clockwise for exactly 12 hours and push crown back. If it changes the date after midnight (12 hours later as it should) - Pull out crown and turn watch hands anti-clockwise for exactly 12 hours and push crown back. Don't do it from 00:00 till 04:00.
Either the crown or the case tube threads are stripped. Which ever part is stripped needs to be replaced. Keep in mind that both could be the problem. Be sure you don't get your watch wet until this is fixed. Your watch is NOT sealed for water resistance if the crown does not screw down.
Hope this helps. Ken Yellowstone Watch Inc. www.yellowstonewatch.com
Your need the following tools to take out the crown...fix the hands and fix the hands.
1. Pointed Small Forcep
2. 7 or 8 no. small screw driver
You can these tools from a hardware store.
As this work is of high perecesion you need to be very careful and need high concentration.
As you have already opened the back cover of the watch you may find an arrow(--->) mark, when you press it and pull out the crown it may come out.
Now you can fix the hand by holding it by forcep and then setting it on the pinion(centre) of the dial or the position you want to fix.
In case of any difficulty you may take the watch to service centre.