Who Pays For Repairs?

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If the landlord provides a stove, refrigerator, dish washer, and washer/dryer in a unit, who pays for the repairs? I think if the tenant caused the damage then the tenant pays. Also if the tenant calls for a repair man with out letting the landlord know, then the tenant pays for that too.
Under what circumstance should the landlord pay for repairs to the above mentioned appliances, which the landlord provided for the tenants convenience?
Also in the case of the dishwasher and washer/dryer if the appliance is damaged beyond repair is the landlord obligated to replace it? Will not replacing it effect the lease and or the rent?

Thank you for your thoughts.