Question about Oster 6329 2-Slice Toaster
My Oster Toaster stopped popping up after a couple of years as well - the lever just stays down until you unplug it or the toast catches on fire.
R3 was burned and replaced per the info on these discussions to no effect.
So I mapped out a rough schematic from the board and found some interesting things. Oster seems to be directly rectifying the line voltage (dangerous but cheap) through D1-D4 into 5V through DZ4 and 32V through DZ1.
These voltages seem to be across R3, which means it has 27V on 1K or about 0.73W on it continuously! Not only is this a waste of power, but it will always burn a 1/2W resistor. I would recommend replacing it with a 1W or larger and setting it up off the board to dissipate the heat into the air.
Then when toasting, the NPN transistor Q2 pulls to GND one side of the coil that holds the lever down. R3 is used as a series current limit for the 32V supply to the other side of the coil (so it has 32V or over 1W on it when toasting).
My problem with the toast not popping up was related to Q2 being blown. I don't remember the original number since I cut it out, but they seemed to have used an audio transistor with a Vce of 20V and Ic of 20mA. No wonder it blew with 32V and 32mA on it - bad design from the start.
I replaced Q2 with a cheap, commonly available 2N2222 - it has the same pinout and is good for 1A and 50V. It's been working great for months, but sadly still burning almost 1W continuously or over 6KWh per year.
Posted on Jul 19, 2008
I too had the blown R3 resistor. I replaced the fried resistor with BRN-BLK-RD-Gold 1 watt version. The toaster still would not eject toast without being unplugged. I then picked up a 15 pack of 2N2222 NPN transistors at Radio Shack (about $2.50). After replacing the Q2 with a new transistor the toaster now works. Thanks for the help.
Posted on Dec 29, 2009
Doesn't seem to be available info in english - do you have any idea where the board was assembled? you could try these guys: http://www.sparkfun.com/commerce/hdr.php?p=contactus they have several different oster models details and might like the challenge best other solution is "yellow pages" or whatever you have - phone any repair shops and ask them if they have the same model in for repair. if you don't have it, here is the user manual, which although no schematics does have a long list of telephone numbers to call: http://www.oster.com/manuals/oster/006329-000-000_English.pdf Hope this helps :)
Posted on Feb 28, 2007
Guess this is what is called planned obsolences. You would think Oster would realize we are onto them!
Posted on Jan 25, 2013
I too have the Sunbeam/ Oester Toaster with a poofed R-3 Resistor,
We found a charred resistor loose in the bottom when we shook it upside down. I replaced it with one that was about the same size as the space provided and that was 1K and soldered it in.
The toaster c.b. still does not function. I am wondering if I have two good solder joints as the foil did not which well to the solder.
Also I am wondering if the board can be purchased. I would like to know if anyone has successfully replaced the R-3 and if so what wattage? Anyway thanks to the Guest who told us it was 1000 ohm. I had one in the basement and it impressed my son!
Posted on Dec 20, 2007
The color code for R-3 is BRN-BLK-RD-Gold. 1K ohm. DD
Posted on Jul 17, 2007
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