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Down the block, into a higher gear. Cable is hanging slack, jockey wheel in correct position below highest gear, chain won’t release second highest gear sprocket.
Dammit-
The cable tightens to go from highest to second highest gear. So if the cable is hanging slack, the shifter isn't pulling the cable and so it won't move from highest to second highest.
Sounds like you need to tighten the cable or the cable is lose/broken in the shifter.
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Oh, hang on you mean it won't go from second highest to highest, even though the cable is slack? Have you tried opening up the H limit screw? Sometimes it can get close but not close enough to complete the shift.
Also, eyeball or tighten the cassette to make sure the cassette cogs all have the same gap and it's not loose.
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jockey wheel in correct position below highest gear, chain won’t release second highest gear sprocket
B-tension issue? If the pulley is too close to to the sprocket, the chain can be reluctant to climb off the larger sprocket
hippy
gbj_tester
@Dammit
When you say 'down' do you mean into a higher or lower gear?
Assuming mechanical?
Does pulling the cable (at the downtube say) without the shifter change properly?
If it's not going into higher gears, it's not releasing cable so something is sticking - either shifter or the cable.