In general, when junipers are browning, they are in severe distress. You really want to figure this out, since it is a nice tree with a beautiful thick trunk. It would be a shame to lose it.
I don't really know what the problem is, but I have some thoughts:
*It looks like your balcony is covered, therefore your juniper is likely not getting enough sun.
*Every other day is too much watering. Bonsai should not be watered on a schedule, but only when they need it, which will be different at different times, depending on temps, amount of sun, humidity, how actively the tree is growing, etc. See bonsai learning tips here:
viewtopic.php?f=36&t=1479
*The soil looks wrong for it, too moisture holding. Bonsai soil should be very loose, gritty, free draining. Here's a thread about bonsai soil:
viewtopic.php?f=21&t=75146&p=424643&hil ... il#p424643
*The white stuff on the soil is salts/ minerals left behind when the water evaporates. It's not a good sign. Are you using tap water? Try watering with distilled water instead. How are you fertilizing? Synthetic fertilizers can leave salts behind also.
Maybe someone who knows more about bonsai than I do will come along with more advice about how to fix all this. But in the meantime you can work on getting it more sun and learning more about when it needs water.
It would help to know where you are located, what your climate is.
How long have you had this tree?