1.Do not boot, disconnect main circuit, unplug P3,
2. Starting up, the universal meter hits 20V, the black marker ground wire, the red marker in order to test the IC1.IC2.IC3.IC4, the multimeter shows 10.9V, which is the promotion of normal,
3. The universal meter hits 200V, the black marker grounding line, the red pen measuring the three-terminal integration stabilized LM317, and the multimeter is shown as 20V, which is normal,
4. Multimeter hits 200V, black marker grounding line, red pen measuring the third leg of the stable pressure of the third end of the three end integration, the multimeter is shown as 15V, which is normal,
5. Turn it off, a measurement output, multimeter diode gears, black pens and host the cathode, red pens and host the anode, multimeter display to 1 for infinity, namely the diode reverse blocking, the machine is normal,
6. Black pens and host the anode, red pens and host the cathode, multimeter with numerical display, and constantly change, namely the diode to the positive, the machine is normal, 7. To turn it off, after the main loop of the good.
8. Capacitance voltage-sharing detection: multimeter to 1000 v, boot, red and black two pens and two measuring capacitance respectively, two pens and measured multimeter display Numbers is greater than 5 v, namely capacitance pressure is normal,9. Turn off the power and connect a 10W/15K rechargeable resistor in the main loop. Insert P3
10. In the case of step 9, the multimeter hits 1000V, then the capacitance is equal to the same as the eighth step. The multimeter display values of the two capacitors are less than 10V, which is normal
11. Shutdown, test output
(1) hit the multimeter to the diode, the black surface to connect the host positive pole, the red pen to connect the host negative pole, the multimeter has the numerical display, and the continuous change, the diode is in the guide,
(2) take the multimeter in the diode, the black surface to connect the host negative pole, the red surface to the host positive pole, the multimeter shows the value of 1 infinity, that is, the diode reverses, the machine output is normal,
Argon arc welding detection
Disconnect the main circuit and unplug the P6
2. When the machine is turned on, the main engine hits the welding gear, the multimeter hits 200V, and the black marker takes the second leg of Q1, and the red marker makes the test in turn.
3. Turn off the power and connect a 10W/15K rechargeable resistor on the main loop line,
4. Switch on the computer. The multimeter can be used for 200V, the red surface is connected to the host, the black surface is connected to the main engine inlet and outlet (TIG), the multimeter shows the value of about 37V, which is the normal output of the empty load.
5. Shutdown, remove the charging resistance, and pick up the main return route.
6. Retest the no-load output for about 79V, that is, the no-load output is normal,
7. When the main engine hits the argon welding gear, the aircraft plug-in can be connected with the metal small screw, and the high pressure flame can be found on the fire board. Only three seconds, the high pressure is normal.
Disconnect the main loop and unplug the P3.
2. The boot in disconnect main circuit, disconnect your drive, boot, multimeter to 1000 v, red pens and geodesic, black pens and integrated three-terminal voltage stability LM7815, multimeters have a numerical display, namely to promote normal.
3. When measuring the normal time, power off, insert the drive line,
4. Shut down and connect a 10W/15K rechargeable resistor on the main loop line,
5. Starting up, in the case of charging, the multimeter diode is used to detect the two modules on the radiator according to the method of measuring the module.
6. When the measuring module is normal, in the case of charging, the multimeter will hit 1000V, and the two meters of red and black will measure the two capacitors in turn. The difference between the two capacitance meters is not greater than 50V, which means that the capacitor is normal.
7. When the machine is turned on and charged, the main engine is in welding gear, the red surface is connected to the host anode, the black pen is connected to the host negative pole, and the multimeter has the value of 1 infinity, which is the output is normal.