Check ringer and if ringer do not show continuity or a good value with meter then change ringer with new one. Check points on board where ringer have to attaché after put in casing housing.
Then check all these paths as shown in diagram above and if any of them is broken or missing components then apply jumpers as described above. Small circle shows positions where we are able to make jumpers. in these place we can apply jumpers to solve ringer problem in nokia asha 303.
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