An automatic frequency control apparatus includes a mixer, a phase error detector, an absolute value converter, a determination unit, a multiplier and an oscillator. A connector retaining bar movable in a horizontal direction is disposed to be opposed to the press blade. A multiplicity of active grid elements function in the grid for supply capacity, supply andor load curtailment as supply or capacity. The shared path includes analog-to-digital converters that are used both in the transmit period of the TDD cycle to convert the feedback signals from the power amplifier output, and in the receive period of the TDD cycle to convert the analog received signals. A flip chip bonder having the chip heating apparatus, and a method for bonding a flip chip using the same are also provided. A current value supplied to each LED associated with the test patterns is adjusted to simultaneously optimize the uniformity in the lines test pattern and the halftone strips test pattern.