Financial leasing contract, a and b signed a financial leasing contract, by a purchase of equipment to b use, b installation process found to have quality problems

According to the contract, B does not have the right to require A to assume responsibility for breach of contract, because the equipment is selected by B, A only has the responsibility to pay. When the equipment is transported to the party B, party B to accept the equipment, equipment, such as quality problems, by the party B to negotiate with the supplier to solve, party A can assist in dealing with, but how to solve the problem by the party B to negotiate with the supplier, party A does not have any responsibility.