1. Pay attention to reset when there are large-scale integrated circuits on the circuit board to be repaired
2. Before the test, it is best to install the equipment back, turn on and off the machine repeatedly, and press the reset key several times
3、 Function and parameter test
1. < tester > the detection of devices can only reflect the cut-off area, amplification area and saturation area, but can not measure the working frequency and speed
Portable microscope for circuit board detection
Portable microscope for circuit board detection
Volume value, etc
2. Similarly, for TTL digital chip, only the output changes of high and low levels can be known, but the speed of its rising and falling edges cannot be found
