no display backlight

1. If the cable is loose, tighten the screw of the cable;

2. Power problem, check whether the power supply of the power box is normal;

3. Display board light is on;

4. Panel back cover regulator tube 7805 output voltage is 5V;

5. The regulator tube 7805 of the rear cover of the panel is plugged in well;

1. If the cable is loose, tighten the screw of the cable;

2. Power problem, check whether the power supply of the power box is normal;

3. Contrast is adjusted, adjust the contrast;

4. The two indicators at the back of the panel (A2 and A3) are on;

5. If the A2 indicator is on and the A3 indicator is off, check whether the program is plugged in properly;

6. Whether the connection between the LCD module and the display board is plugged in well;

1. If the cable is loose, tighten the screw of the cable;

2. Check whether the power supply +12V, +24V1A is normal;

3. The connection cables (20 and 26 cores) between the display board and the keyboard board are properly connected;

4. Whether the backlight cable of the LCD module is inserted properly;

1. If the cable is loose, tighten the screw of the cable;

2. Power problem, check whether the power supply of the power box is normal;

3. Check whether the regulator tube 7805 on the back cover of the panel is plugged in well and the output voltage is normal;

4. The peripheral power supply voltage (220VAC or 380VAC) is too low or unstable;

1. Low battery voltage (generally not less than 3V);

2. Memory block is bad;

3. Check whether the mode number page is set normally (0 mode number does not remember);

4. Chinese and English interchange, change the display program;

1. Power problem, power supply +5V, +24V1A, +24V6A voltage is normal, the host board red light is on;

2. Whether the emergency stop switch is pressed, whether the RUN lamp is on, if not, directly short-circuit the RUN and COM;

3. There is no short circuit, short circuit protection indicator (a red light near the CPU) is bright, if it is bright, first see whether the power supply +24V6A is normal, break the load (that is, do not connect the hydraulic valve), restart, such as normal start, and then check whether the peripheral load is short circuit;

4. Whether the program is plugged or bad;

1. There is no alarm;

2. Whether there is short circuit, there is overload phenomenon;

3. Whether the three-phase power is normal;

4. The connection between the display board and the keyboard in the panel is loose;

1. RUN the light is bright, the panel manually light is on;

2. Check whether the power supply +24V1A, +24V6A, +36V4A is normal, whether the safety tube is burned;

3. Whether the data is set;

4. Check whether there is no pressure flow or no direction valve output;

5. Whether the stroke switch is pressed (whether the indicator light is on), check whether the stroke switch is short-circuited or the stroke switch is in an improper position

6. There is no output, if there is output, check whether the peripheral hydraulic valve is bad or broken;

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1. Output indicator light is bright, first disconnect the load, see whether the indicator light is bright, use a multimeter to measure whether the output end has 24V voltage, if no voltage is to see whether the output transistor is bad, if there is voltage is to see whether the periphery is broken or whether the hydraulic valve is bad;

2. Whether the stroke switch is pressed (the indicator is bright), check whether the stroke switch is short-circuited or the stroke switch is in an improper position;

1. Check to see if power +24V1A works;

2. First short-connect the corresponding input point with 24VG to see whether the input indicator is on, if it is on, then check whether the line of the travel switch is broken or whether the travel switch is bad, if it is not on, see whether the input indicator is bad;

1. Emergency stop switch pressing, see whether the output indicator light is still bright, if bright, the output transistor is bad, replace the corresponding transistor;

2. Use a multimeter to measure whether the corresponding output end has 24V voltage output, if there is no output, the hydraulic valve is bad;

1. Peripheral to the host input point X014, X013 line is loose;

2. Whether the travel switch is loose;

3. Whether the travel switch is damaged;

1. Display monitoring page has no traffic pressure data display, if there is a display then change the program;

2. Press the emergency stop switch to see if there is output, if there is no output, the host board is bad;

3. Output triode C pole and E pole is short circuit, such as short circuit change triode;

1. Power box +36V4A is normal, safety tube is burned;

2. Disconnect the valve, press an action, use a multimeter to measure whether there is output voltage, if there is no output voltage then check the feedback resistance (5W1Ω) Whether open circuit; If there is output voltage, then use a multimeter to measure whether the resistance value of the valve is normal;

1. The total travel of the electronic ruler has no setting, whether the reset switch is set to "open "(" open" means that the data has been zero);

2. Check whether the power supply +12V, -12V voltage is normal;

3. Use a multimeter to measure whether the voltage at both ends of the electronic ruler is 10V, if there is no 10V, then check the electronic 4. Whether the ruler board is plugged in well or bad;

5. The line of the electronic ruler is connected incorrectly;

6. Electronic ruler is bad;

1. Electronic ruler clear zero position is correct, should be in the initial position of each trip clear zero;

2. Whether the line of the electronic ruler is connected incorrectly;

3. Electronic ruler is bad;

4. If no afore-mentioned problems, must adjust electronic foot plate, this must by professional adjustable

1. Check whether the 44 core wires of the thermocouple patch board and the host board are loose;

2. Whether the thermocouple is in poor contact or bad;

3. Change the wiring board or host board of the thermocouple;

1. Check the power supply +12V, -12V is normal;

2. The triode 335 of the thermocouple patch board or the triode 336, C351 of the main board is bad;

1. Whether the data and function Settings of the temperature page are correct;

2. Power supply 24V1A voltage is normal;

3. Whether the fuse is burned;

4. Whether the heating indicator light is on, if not, check whether the indicator light, relay, exhaust resistance is bad;

5. Whether the contactor is sucked, whether the corresponding air switch is tripped, and whether the heating ring is bad;

1. Check the power supply +12V, -12V is normal;

2.44 Whether the core wire is inserted properly; Whether the thermocouple wire is in good contact, whether it is bad;

3. Whether the connection between the thermocouple and the adapter plate is shielded;

4. Whether the thermocouple patch board is grounded;

5. If no problem, replace the host board;

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