Chapter 4. Common Faults Quick Maintenance; No Display On Power-Up - Veichi AC310 Service Manual

Universal ac drive

Hide thumbs Also See for AC310:

Table of Contents

AC310 Universal AC Drive Service Manual

Chapter 4. Common Faults Quick

Maintenance

(Note: All control signals are processed by the CPU. If the CPU is damaged or does not

work, it will cause a malfunction, so after eliminating other malfunctions, finally check

whether there is a problem with the CPU).

1. Damaged module

Cause: The rectifier part of the module is damaged, resulting in no or low voltage at the

busbar and no display.

Measurement method: Measure the rectifier static value of the module.

Solution: Replace the IGBT.

2. Switching power supply failure

Cause: The voltage generated in the switching power supply is faulty, resulting in the

inability to supply power to the control board, which leads to no display.

Measurement method: Measure whether the voltage generated in the switching power

supply is abnormal.

Solution: according to the switching power supply repair method to repair.

3. Control board problems countermeasure: Replace the control board with a good

board. If the fault is eliminated, it is the problem of the control board. In the control

board may be the CPU and the keyboard display circuit have a problem.

Detect CPU-related circuits: Measure whether the +5V power supply is good, if +5V is

normal, the +3.3V power supply generation circuit for repair; then test the reset chip

U15 whether there is a problem; followed by an oscilloscope in the crystal oscillator at

both ends of the GND measurement, should be a sinusoidal wave.

4. Detect the keyboard display circuit (keyboard damage, or damage to the standard

network interface cable connected to the keyboard): According to the previously

mentioned the repair method to detect

Solution: If the damage of the corresponding device is detected, replace it directly, if

there is no failure above, then it is CPU failure.

Note: R151 is a 0Ω resistor on the P line, if the resistor fails, it will cause the bus

voltage to be cut off and no power will be supplied, resulting in no power to the

Table of Contents