Fault phenomenon - output is 0mA

1) The output transistor is damaged;

2) The output of the integrated operational amplifier is negative potential;

3) The bridge power supply is damaged or its circuit connection is open circuit;

4) Output transistor emitter resistance or open circuit lead;

5) The output connection is open.

Fault phenomenon - output is 10mA

1) Output transistor breakdown;

2) The integrated operational amplifier outputs a positive potential to make the transistor conductive;

3) The integrated operational amplifier is damaged.

Fault phenomenon - unstable output of digital display controller troubleshooting

1) Excessive external interference;

2) Unstable bridge power supply;

3) There are virtual solder joints in the relevant components or solder joints;

4) Poor contact of connectors;

5) The internal noise of the integrated operational amplifier increases;

6) The power supply voltage is too low;

7) The output transistor has poor characteristics.

Fault phenomenon - the monitor does not light up at all

1) Damaged power transformer or open circuit in related wiring;

2) The fuse is blown (open circuit);

3) The power connection of the digital panel meter is open circuit;

4) The LED display is damaged.

Fault phenomenon - display overflow

1) The input signal line has an open circuit in the inner part of the table;

2) The amplifier power supply is damaged;

3) The integrated operational amplifier is damaged;

4) 7107 is damaged;

5) The input of the digital panel table is open circuit.

Fault phenomenon - only displaying "000"

1) The bridge power supply of the signal conversion section is damaged;

2) The amplifier power supply is damaged;

3) 7107 is damaged;

4) The integrated operational amplifier is damaged.

Fault phenomenon - incomplete display text

1) The LED display is damaged;

2) 7107 is damaged;

3) There is an open circuit connecting the LED and 7107.