USDJPY quotes started the new week with a correction. Looking technically at the D1 interval, before the weekend the price reached the upper limit of the wide upward channel, where sellers appeared. For now it is far too early to think about a change in sentiment, nevertheless the last upward wave was made in one go, so there is a risk of a deeper downward correction. Should the discount actually gain momentum, the 137.30 - 137.90 zone should be regarded as key support. Resistance remains around the 141.00 level, which is the area of the upper limit of the aforementioned upward channel.
USDJPY interval D1. Source: xStation5
Looking at the lower time frame - H1, we can see the very strong uptrend. The key short-term support is the level of 139.60, which is derived from the lower limit of the 1:1 structure and the EMA100 average. According to the overbalance methodology, only a break of this support could lead to a deeper discount. 
USDJPY H1 interval. Source: xStation5
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