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Toaster help

D

Dave

Jan 1, 1970
0
I KNOW this is a risky topic here . . please do your best to refrain from
abusing anyone, making reference to abusing anyone or making reference to
abuse by anyone!

I have a not-old Sunbeam Model A3220 Toaster that has ceased working (unless
I press down hard on the handle). It turns out the solenoid that holds a
hook that holds the toast "carriage" down doesn't operate (though it seems
to have continuity). Does anyone know the board? Does anyone know if there
is a common fault on the board?

There is a component marked TH (with 204 on it) that could be a thermistor.
It appears to be open circuit, so could be the problem, I guess. There are a
coupe of diodes, several transistors, a rheostat and a couple of capacitors,
so it is quite simple - though probably beyond me. I haven't yet removed
and replaced any parts but thought I'd see if anyone knows the circuit
first.

Any expernience/knowledge? Our last toaster was electro/thermo/mechanical
with no electronics at all.

Thanks folks.

Dave
 
F

Franc Zabkar

Jan 1, 1970
0
I KNOW this is a risky topic here . . please do your best to refrain from
abusing anyone, making reference to abusing anyone or making reference to
abuse by anyone!

I have a not-old Sunbeam Model A3220 Toaster that has ceased working (unless
I press down hard on the handle). It turns out the solenoid that holds a
hook that holds the toast "carriage" down doesn't operate (though it seems
to have continuity). Does anyone know the board? Does anyone know if there
is a common fault on the board?

There is a component marked TH (with 204 on it) that could be a thermistor.
It appears to be open circuit, so could be the problem, I guess.

An NTC thermistor will have a high resistance when cold, and a low
resistance when hot.
There are a
coupe of diodes, several transistors, a rheostat and a couple of capacitors,
so it is quite simple - though probably beyond me. I haven't yet removed
and replaced any parts but thought I'd see if anyone knows the circuit
first.

Any expernience/knowledge? Our last toaster was electro/thermo/mechanical
with no electronics at all.

Thanks folks.

Dave

Test the active components with a DMM.

Otherwise here are some useful resources:

Small Household Appliances repair FAQ:
http://www.repairfaq.org/sam/appfaq.htm

Results of US patent search:
http://www.google.com/patents?as_q=...&as_miny_ap=2008&as_maxm_ap=1&as_maxy_ap=2008

http://preview.tinyurl.com/6dls2n

- Franc Zabkar
 
E

Eeyore

Jan 1, 1970
0
Dave said:
I KNOW this is a risky topic here . . please do your best to refrain from
abusing anyone, making reference to abusing anyone or making reference to
abuse by anyone!

I have a not-old Sunbeam Model A3220 Toaster that has ceased working

Was this aimed at Phil Allison ?

Graham
 
I

ian field

Jan 1, 1970
0
Dave said:
I KNOW this is a risky topic here . . please do your best to refrain from
abusing anyone, making reference to abusing anyone or making reference to
abuse by anyone!

I have a not-old Sunbeam Model A3220 Toaster that has ceased working
(unless I press down hard on the handle). It turns out the solenoid that
holds a hook that holds the toast "carriage" down doesn't operate (though
it seems to have continuity). Does anyone know the board? Does anyone
know if there is a common fault on the board?

There is a component marked TH (with 204 on it) that could be a
thermistor. It appears to be open circuit, so could be the problem, I
guess. There are a coupe of diodes, several transistors, a rheostat and a
couple of capacitors, so it is quite simple - though probably beyond me.
I haven't yet removed and replaced any parts but thought I'd see if anyone
knows the circuit first.

Any expernience/knowledge? Our last toaster was electro/thermo/mechanical
with no electronics at all.

Thanks folks.

Dave

The component marked 204 could be a thermal fuse.
 
D

Dave

Jan 1, 1970
0
Thanks Franc,
I'd found the first one but in all my use of Google, i was not aware of the
Patents datatbase . . thanks very much.

dave
 
D

Dave

Jan 1, 1970
0
Thanks Ian,

It sure doesn't look like a thermal fuse . . but could be, I guess as I am
not well exposed to the world of thermal fuses! It is round/disc, black,
glazed and LOOKS more like a smallish (4mm) ceramic capacitor.

I'll get onto the job today and see how I go. I miss my toast.

dave
 
I

ian field

Jan 1, 1970
0
Dave said:
Thanks Ian,

It sure doesn't look like a thermal fuse . . but could be, I guess as I
am not well exposed to the world of thermal fuses! It is round/disc,
black, glazed and LOOKS more like a smallish (4mm) ceramic capacitor.

From that description I'd suggest maybe a VDR.

It would normally read O/C until you exceed its hold off voltage - that
should be the peak value of the mains plus a safety margin.
 
D

Dave

Jan 1, 1970
0
Because of the size and location of the mains voltage board, I treated it
with respect. After a bit of testing of individual components I couldn't
find any electronic component obviously faulty.

Eventually it transpired that whilst the thing would toast when firmly held
down (i.e. power was applied to the elements and circuit board), any slight
movement "un-applied" voltage to the circuit board whilst the element was
still powered, so the solenoid dropped out. It turned out that a post
holding a primary contact was slightly bent and a reliable connection
couldn't be made.

I'm not sure that this clarifies the issue for readers, but it is a weak
electro-mechanical point in this toaster.

Thanks to those who replied.

dave
 
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