seems i have been sucessful in repairing my clock on the digital display of the GT250R.
my issue was.... i could set the clock but when i switch off the kay and switch it back on again, the clock would reset to 12:00. the repair is easy, you just need to know how to carefully solder and use a screwdriver. if you have the parts needed, probably take about 1-2 hrs.
reason for the fault is, hyosung decided not to connect the clock to a 24hr feed back to the main bike battery. so they soldered a tiny CR927 lithium battery to the speedo pcb. not a bad idea if they made the battery easy to replace
with the key off, the battery keeps the time, key on and bike battery kicks in. so if you dont ride your bike alot, the battery will die faster....no big issue. an almost dead battery may also cause issues with how accurate your clock is, so if you find you need to change the time alot, try replacing the battery.
parts needed:
solder and soldering iron
CR1620 pcb mount battery
heatshrink to insulate pcb pin tails on battery
heat shrink to cover entire battery
0.25mm appliance wire, red and black 150mm long will be more than enough.
philips screwdriver
allen key set
cresent
magnet on a stick.
how to:
make sure the keys are off and in your pocket.
remove the windsheild to expose the digital speedo
undo the 3 screes holding the speedo mount
disconnect the wiring plug and the nuts holding the mount to the rear or the speedo
leave the three cables screwed behind the tacho, no need to touch these.
undo the 4 screws behind the speedo, around the wiring plug
becareful with the following instructions
undo the 6 outer screws to open the front of the casing
the speedo is loose, dont drop it, dont tap it against anything, this is expensive to replace.
carefully place it on a clean work bench
being careful of the glass display, separate the top from the bottom. there are 4 screws holding the two together.
place the top display PCB somewhere safe
on the bottom PCB will be a small round component, mine was insulated yellow. it's dimensions are 9mm wide x 2.7mm thick. this is the battery.
becareful of the folowing. you dont want to spread solder to other areas of the pcb
carefully desolder and remove the battery.
get the new battery, solder the new cable to the pins and heatshrink the connections. make sure you have soldered the connections correctly, check for polarity (red = +, black = -)
slide the new battery into the bigger piece of heat shrink and heat it so the entire battery is fully insulated apart from the 2 wires coming out of one end.
becareful of the folowing. you dont want to spread solder to other areas of the pcb.
now solder the 2 wires to the bottom pcb (through the pcb, like the original battery was. dont just solder to the top or bottom of the pcb), make sure you have the polarity correct.
trim back the newly soldered connections so they dont short out.
reconnect the 2 halves of the speedo, careful not to damage the pin connector or the glass display. (note: you can test the batt voltage here too) in the pic you will see i had removed the tacho (isn't that mexican food?), i'm just using the pic to show how the battery fits snugly.
reinstall the speedo into the rear of the casing (which will still be on the bike) with the 4 screws that are around the electrical connector.
push the battery between the pcb and housing. it should be a comfortable, snug fit. no pressure on either the battery or the pcb. you dont want it loose and bouncing around either.
reinstall the front of the speedo with the 6 outer screws
temporarily reattch the wiring plug behind the speedo and switch on the bike. be very careful not to short out the terminals behind the tacho. wrap a thick rag around the tacho to be safe.
adjust the clock by holding down the top button on the right, push the top button quickly for hr, lower button for min.
hold down top button until the clock stops flashing.
if the following didnt work, jump to next paragraph.
switch off the bike, wait 1 min and switch it back on again. the time should be heldand possibly 1 min more than you last saw it.
unplug the electrical connector
reinstall the mount and nuts
reattach the electrical plug
reinstall the speedo with the 3 screws
reinstall the windsheild.
if it ddint work
open the speedo back up
remove it from the housing
with a digital DC volt meter, check the voltage at the battery, you should see 3v. actually, 2.8v-3.2v would be okay.
recheck polarity with the volt meter
if you still are having issues, post a comment here.
and thats it, you now have a working digital clock on your Hyosung GT250R speedo display
no need for an aftermarket attachment, wrist watch or guessing what time it is.
i took a few pics while i did this, i will throw them up when i have time.
i'll also throw up some part numbers and store to buy the stuff from.
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