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Old 07 January 2020, 10:04   #3
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Join Date: Dec 2018
Location: UK
Posts: 852
This should be the schematic for the tank mouse:


If the left/right directions - i.e. (H)orizontal is working, but there are issue with the up/down directions - i.e. (V)ertical, that could an issue with:

1. The pins/cable for the V and VQ signals - i.e. pins 1 and 3.
2. The pull up resistors for the V and VQ signals.
3. The logic chip LM339 (Quad differential comparator).
4. The pull down resistors for V and VQ inputs to the LM339.
5. The V optical sender and receiver components.

So you should check these traces/pins/components.
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