Symptom: Cannot operate by press a button on the front of the machine/the machine does not recognize the operation from the front panel.
Troubleshooting Methods:
1. Does 220 AC wire, minor wires or socket is ok?
2. Does fuse is broken?
3. Found a burn on the PCB. Check internal equipment is not damaged - in normal condition.
4. Check 220 VAC power at the control panel transformer - in normal condition
5. Check the mechanism and the switch to open and close the door) - normal condition
6. There is a power to wait at the relay - in normal condition
7. DC power is released from the Bridge Rectifier - normal condition
1. It was found that the burn marks on the printing plate at Q3, R7, R8, R9, ZD3 and ZD4
2. Solder marks under printed sheets wear out. Solder The device leg is loose.
2. Does fuse is broken?
3. Found a burn on the PCB. Check internal equipment is not damaged - in normal condition.
4. Check 220 VAC power at the control panel transformer - in normal condition
5. Check the mechanism and the switch to open and close the door) - normal condition
6. There is a power to wait at the relay - in normal condition
7. DC power is released from the Bridge Rectifier - normal condition
Summary from Investigation:
2. Solder marks under printed sheets wear out. Solder The device leg is loose.
Resolution:
Remove all old lead, keep soldering with new lead, clean print sheet And test the machine again.
Result:
Able to press control panel to operate from the front of the machine to return to normal use - set the time for work / warm up hot food.
- URUPONG KALAKARN
POND SAMCHUK LAB
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