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Black and Decker Toaster oven Toast Switch Repair TRO360

G

Guest

Jan 1, 1970
0
Posting this for the benefit of others ( Google Groups search etc.)

We purchased a Black and Decker TRO-360 Toaster Oven about 4 months
ago and recently the toast switch failed. The switch does not stay
down. According to the reviews at Amazon this is a common problem.
Many people in the reveiw section for this item are complaining of the
same problem. I decided to try and repair the oven as I have an
under counter bracket and heat shield for it which is very handy.

The switch is held down by an electromagnet that is driven by a small
timer board inside the oven. The timer board converts the setting of
the toast setting pot to a digital value and then uses a 'count-down'
type digital timer to control the toasting time. The part that
failed on the timer board in ours was a 6.2V Zener Diode part number
1N4735A that provides power to the CD4060 CMOS counter chip used as a
timer. The zener failed open and was only providing only about 1V to
the circut instead of the 6.2V required. It was an easy fix and now
it works like brand new again. Because of the nature of the circuit,
it was hard for me to trace the problem to this little guy. It is
the only zener on the little circuit board. I had a 6.8V 1W Zener in
my junkbox and because the CMOS chip is tolerant of a wide range of V
I used that instead of the factory part. It seems that the timer
maybe runs a bit faster now but it works just fine. Just need to set
the toast setting knob a bit lower.

I am posting this because I searched the Internet expecting to find a
technical note or release from B&D about this problem or maybe a post
from someone else. No luck! I suspect that this is probably what is
failing on all of them and a defect from the factory. Would be
curious if you own one of these ovens with this problem, please email
me.

Have yet to have it make any toast that is worth selling on Ebay but
still hoping.
 
N

NSM

Jan 1, 1970
0
| Posting this for the benefit of others ( Google Groups search etc.)
|
| We purchased a Black and Decker TRO-360 Toaster Oven about 4 months
| ago and recently the toast switch failed. The switch does not stay
| down. According to the reviews at Amazon this is a common problem.
| Many people in the reveiw section for this item are complaining of the
| same problem. ...

Wal-Mart have a $20 Toaster Oven with a mechanical timer that works well!

N
 
F

Franc Zabkar

Jan 1, 1970
0
Posting this for the benefit of others ( Google Groups search etc.)

We purchased a Black and Decker TRO-360 Toaster Oven about 4 months
ago and recently the toast switch failed. The switch does not stay
down. According to the reviews at Amazon this is a common problem.
Many people in the reveiw section for this item are complaining of the
same problem. I decided to try and repair the oven as I have an
under counter bracket and heat shield for it which is very handy.

The switch is held down by an electromagnet that is driven by a small
timer board inside the oven. The timer board converts the setting of
the toast setting pot to a digital value and then uses a 'count-down'
type digital timer to control the toasting time. The part that
failed on the timer board in ours was a 6.2V Zener Diode part number
1N4735A that provides power to the CD4060 CMOS counter chip used as a
timer. The zener failed open and was only providing only about 1V to
the circut instead of the 6.2V required.

IME, this is a common problem with toasters. However, I would have
expected the zener to fail in the SC condition. If it were open,
surely the IC supply voltage would be a lot higher than 6.2V??? Of
course I'm assuming that this zener is connected between Vdd and
Ground.


- Franc Zabkar
 
F

Fred

Jan 1, 1970
0
In my experience over the past 5 years or so, Black & Decker haven't made a
decent electric tool/appliance in years. I have bought one of their small
drills, then returned it when the motor seized up after 2 months. The
replacement worked for a year, then the motor developed an open circuit.
Same for a small jig saw -- the blade moved up and down at about a 5-degree
angle off vertical. The company must have been taken over by some Wall
Street money-vacuum group because theire stuff used to be quite good, but
now I wouldn't touch any of their stuff.
 
S

Sue D Nim

Jan 1, 1970
0
B & D toaster ovens are downright dangerous fire hazards and should not be
used. Many CPSC cases open. I've seen several burn up after little use. Most
other B & D tools are also poor quality; so much so, they had to revive the
DeWalt name to get any commercial sales.
 
F

Fred

Jan 1, 1970
0
Sue D Nim said:
B & D toaster ovens are downright dangerous fire hazards and should not be
used. Many CPSC cases open. I've seen several burn up after little use. Most
other B & D tools are also poor quality; so much so, they had to revive the
DeWalt name to get any commercial sales.

Do you mean that DeWalt is actually Black & Decker!??? Thanks very much
for the info! Those sneaky rascals!!!
 
R

Richard

Jan 1, 1970
0
Sue D Nim said:
B & D toaster ovens are downright dangerous fire hazards and should not be
used. Many CPSC cases open. I've seen several burn up after little use. Most
other B & D tools are also poor quality; so much so, they had to revive the
DeWalt name to get any commercial sales.

I had a client place a load of groceries in front of her B&D toaster
oven. One of the sacks turned on the "toast" lever. When she came back
into the kitchen because she smelled something burning her groceries
were going up in flames!

If you ever saw the inside of one of these things you would only run
it on a GFCI or buy another brand.

Richard
 
J

James Sweet

Jan 1, 1970
0
Fred said:
Do you mean that DeWalt is actually Black & Decker!??? Thanks very much
for the info! Those sneaky rascals!!!

Now that I didn't know! I've actually had reasonable luck with DeWalt stuff,
feels a lot better made than the cheapo B&D.
 
N

NSM

Jan 1, 1970
0
| > B & D toaster ovens are downright dangerous fire hazards and should not
be
| > used. Many CPSC cases open. I've seen several burn up after little use.
Most
| > other B & D tools are also poor quality; so much so, they had to revive
the
| > DeWalt name to get any commercial sales.
|
| I had a client place a load of groceries in front of her B&D toaster
| oven. One of the sacks turned on the "toast" lever. When she came back
| into the kitchen because she smelled something burning her groceries
| were going up in flames!

Mine is a Sunbeam - no levers, two dials only. No problems so far for $20.

N
 
L

Lenny

Jan 1, 1970
0
Theres no zener in my 1955 Toastmaster and it still works just fine.
We really NEED all this technology right? Lenny Stein, Barlen
Electronics.
 
N

NSM

Jan 1, 1970
0
| Theres no zener in my 1955 Toastmaster and it still works just fine.
| We really NEED all this technology right? Lenny Stein, Barlen
| Electronics.

I've never seen the point. I cannot say I have seen electronics improve any
sort of toaster, and it sure doesn't help with reliability or
serviceability.

N
 
T

**THE-RFI-EMI-GUY**

Jan 1, 1970
0
Mine caught fire because of too much butter and toast crumbs. This unit
replaces the last one to burn up! After it cooled I took it outside to
the deck to hose it out thinking it was electro-mechanical. Then I found
that little PC board inside! After some 91% alcohol rinse and drying in
the Florida sun, I plugged it in and all works well. Still the design is
such that it can cause a serious fire even with the heat shield.

I will not be buying another of these once it wears out. I only bought
the replacement because it slid back in the bracket the old one was in.

B & D toaster ovens are downright dangerous fire hazards and should not be
used. Many CPSC cases open. I've seen several burn up after little use. Most
other B & D tools are also poor quality; so much so, they had to revive the
DeWalt name to get any commercial sales.

--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"

The Lost Deep Thoughts By: Jack Handey
Before a mad scientist goes mad, there's probably a time
when he's only partially mad. And this is the time when he's
going to throw his best parties.
 
J

James Sweet

Jan 1, 1970
0
NSM said:
| Theres no zener in my 1955 Toastmaster and it still works just fine.
| We really NEED all this technology right? Lenny Stein, Barlen
| Electronics.

I've never seen the point. I cannot say I have seen electronics improve any
sort of toaster, and it sure doesn't help with reliability or
serviceability.

Sure they can, who hasn't had the frustration of pushing a toaster down a
half dozen times while trying to toast a piece of bread when it's still hot
from the last piece? There's a toaster in the lounge at work that's
electronic and it always toasts consistently regardless of whether it's hot
or cool.
 
N

NSM

Jan 1, 1970
0
|
| | > I've never seen the point. I cannot say I have seen electronics improve
| any
| > sort of toaster, and it sure doesn't help with reliability or
| > serviceability.
|
| Sure they can, who hasn't had the frustration of pushing a toaster down a
| half dozen times while trying to toast a piece of bread when it's still
hot
| from the last piece? There's a toaster in the lounge at work that's
| electronic and it always toasts consistently regardless of whether it's
hot
| or cool.

A good toaster uses a double stroke thermal motor so this should not be a
problem.

N
 
J

James Sweet

Jan 1, 1970
0
NSM said:
|
| | > I've never seen the point. I cannot say I have seen electronics improve
| any
| > sort of toaster, and it sure doesn't help with reliability or
| > serviceability.
|
| Sure they can, who hasn't had the frustration of pushing a toaster down a
| half dozen times while trying to toast a piece of bread when it's still
hot
| from the last piece? There's a toaster in the lounge at work that's
| electronic and it always toasts consistently regardless of whether it's
hot
| or cool.

A good toaster uses a double stroke thermal motor so this should not be a
problem.


Who makes a "good" toaster and how do you know what models have this? All
the cheap ones I've used (and some expensive ones) suck, the electronic ones
have all worked pretty well, haven't owned one myself yet though.
 
N

NSM

Jan 1, 1970
0
|
|
....

| > A good toaster uses a double stroke thermal motor so this should not be
a
| > problem.

| Who makes a "good" toaster and how do you know what models have this? All
| the cheap ones I've used (and some expensive ones) suck, the electronic
ones
| have all worked pretty well, haven't owned one myself yet though.

The ones I used to service had a thermal element for timing that would bend
forward, catch a latch, cut power to the element then trip the mechanism on
the backstroke as it cooled.

But the ne plus ultra of them all IMO was the Sunbeam? which lowered the
toast when it was dropped in, cooked it, then raised it back up.

N
 
J

James Sweet

Jan 1, 1970
0
The ones I used to service had a thermal element for timing that would bend
forward, catch a latch, cut power to the element then trip the mechanism on
the backstroke as it cooled.

But the ne plus ultra of them all IMO was the Sunbeam? which lowered the
toast when it was dropped in, cooked it, then raised it back up.

We had one of those pieces of crap when I was a kid, my parents got it as a
wedding present and it was supposed to be the latest and greatest. I have
many memories of repeatedly slamming pieces of toast down in it to make it
go down, and it did the same thing most toasters do, first piece would toast
real dark, subsequent pieces you'd have to crank the darkness higher and
higher as the whole toaster heated up. I have always been curious how it
worked though, I should have torn it apart when it finally croaked.
 

roger

Nov 8, 2009
1
Joined
Nov 8, 2009
Messages
1
The part that
failed on the timer board in ours was a 6.2V Zener Diode part number
1N4735A that provides power to the CD4060 CMOS counter chip used as a
timer. The zener failed open and was only providing only about 1V to
the circut instead of the 6.2V required. It was an easy fix and now
it works like brand new again.

Great tip! I have a Black & Decker toaster ("Electronic Cool Touch", model TS275) with exactly the same problem - the lever would not stay down. I replaced the 6.2V Zener diode and now it works again. (I replaced it with a 5W 6.2V Zener diode, NTE5119A, which I hope will be a little more robust than the original 1W part.)

Thanks - you saved my toaster from the landfill!
 

Jim Seattle

Jun 16, 2010
1
Joined
Jun 16, 2010
Messages
1
Thanks

I see you posted this a while back. If your still around, thanks for the tip. I had pulled my over apart and started checking things on the control baord. I did a google search and found your note which led me straight to the shorted zener. I had a 6v 1 watt model in my parts box and now I have toast too.
 
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