The electromagnetic furnaces have a number of failures, such as failure to turn on, open alarms without heat, displaying fault codes, intermittent heating, malfunctioning of panels, etc。
Electromagnetic furnace circuits are also complex, such as power circuits, heating main circuits, curing pan circuits, igbt-driven circuits, synchronized circuits, current detection circuits, voltage protection circuits, grid electrocution circuits, etc., which have a headache from failure. How shall we find out? What good ideas
I. No response on the switchboard. Burn the safety tube
Large power components are often punctured, and often the failure is caused by cockroaches, causing electrical failure of short circuits between the power components。
One shell to clear the circuit board
(b) a gbt power tube is measured at ghp。
The 3 power tubes were punctured, often accompanied by a streaming bridge。
If the circuit boards are clean, keep checking:
It is also necessary to check whether the 1gbt power ratio is poor and the conditions for replacement are best。
5+300v filtering capacitor failure, leakage
Is there a failure in the vibrator
Did the 7 + 18 v steady pipe break through
Whether or not the wiring of the eight circuit boards has been burned is often easily overlooked。
Has the power limit been burned
Whether the 10 power chips are damaged or not is determined by measuring whether or not their electric feet are punctured to the ground using a tensile surface diode slot。
Following examination of these aspects, damage elements are replaced, incandescent light bulbs are colluded in the safe, and they are opened for observation and, if restored, they can be fitted with a tester。
Ii. No response to the start-up, no firing of the safety tube
It is clear that the power supply is non-working or abnormal。
1 to see if the power lines, plugs are damaged
2 power-limited current resistance variable, open
3 starter +300v, +18v, +5v are normal, determination of the failure range and detection of their respective fault areas。
If no +5v is available, check the flow filter component of the road and 7805, etc。
If no +18v, check the flow filter component of the road and the +18v steady-pressure tube。
If no +300v, check its flow filter component。
If +18v and +5v are not available, check the power source to manage the chip and its power supply。
Iii. Turn on the alarm, no heat
First or first, check if three key voltages are normal:
+300v normal
+18v, +5v is normal。
Both voltages are normal and analysed according to the failure code:
A, e1, e2, e3 check whether the surface temperature sensors are subject to electrical resistance (approximately 100 k normal)。
Tests whether the main chip's surface temperature sensor data entry-end resistance element is variable。
B, e4, e5, e6 check if the surface temperature sensor of igbt is abnormal。
Checks whether the input-end resistance element of the lgbt surface temperature sensor of the master chip is variable and leaks。
Check if the wind machine is abnormal and if the vent is blocked, resulting in excessive internal temperatures。
C. E0 failures are the most common and widespread。
E0 indicates failure of the pot and indicates failure of the circuit。
There's a lot of electrical access:
A. The main heating circuit
Main check for resonance and lgbt power tubes and +300v filtering
B. Synchronized circuits
It's the easiest thing to do
C. Igbt-driven circuits
Main search drive for tubes and bias resistance
D. Master chip
Not easily
E. Three voltages
The three main voltage abnormalities must have been the result of the failure to report e0。
Main check +300v filter capacity, etc。
Iv. Harmonizing the heat
One, check if coronary is welded
Check if the dialers are bad
3+300 v voltage unstable, for reasons
The high temperature in machine 4 caused high temperature protection and inspection of fan and wind vents。
V. Panel failure
The 1 key is broken, the opening key fails, and the leak leads to a malfunction in panel operations。
2 the failure of the panel due to a leak in the light or digital tube。
The 3rd panel was dirty and resulted in electricity leaks, rendering the operation inoperable。
The electromagnetic furnace looks like a small home power, but it's hard to fix, isn't it
