Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Kenmore microwave acting intermittently
Okay, so I've tried everything possible to get a microwave that was
picked up off the street to work. It's a Kenmore 565.8925590, 1300W, serial 1V7C01490, manufactured September 1991. The magnetron and controller IC are made by Sanyo, so I imagine that the entire oven was, too. So, here's the symptoms the microwave exhibits: The microwave will happily begin to microwave a cup of water. After about a minute or so, the fan and the turntable will stop. The light stays on, and the counter keeps going. If I stop the microwave cycle and let the oven cool down, I can start it up again, for about another minute. So, I opened it up, and checked the usual suspects (fuse, interlock switches, etc.) The primary interlock switch was always open, so I replaced it. That didn't fix anything. All of the switches appear to be making good contact with the actuators on the door. There are two thermal protectors. Both offer a resistance of zero, and according to the schematic (and the actual wire routing) if either opened, it would kill power to the entire oven--so I know that they are not at fault here. The magnetron does become hot to the touch, but it's not _that_ (135 degrees centigrade) hot. As far as I can tell, the only thing left to be at fault is the relays, that are located on the controller board. I'm a little leery of testing the relays on it with the oven live--especially because the warning labels clearly state that the step-down transformer will give me a jolt. :-) There is a burn mark on the PCB in the center, but the resistors, diodes, and caps in that area all test fine. Any suggestions? Thanks! --Chris |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Under Counter Microwave Problem | Electronics Repair | |||
The merits of microwave seasoning | Woodturning | |||
drying wood in microwave | Woodturning | |||
Sharp R7380 Microwave | Electronics Repair |