Not sure yet what I have learned thus far…………

Pic’s of the circuit board, no time still inbetween helping my Customers at the moment. Will work on a drawing later.


I’ll post more later, at work right now.

kv

Edit: Found Someone working on the same thing lol http://esalvage.blogspot.com/2016/04/toaster-controller-a0201d.html

 

Seems the guy does not really know what he is doing and trouble shooting by guess work and luck.
The right idea is to do a little reverse engineering first in order to trouble shoot with a little semblance of reason!

 

Seems the guy does not really know what he is doing and trouble shooting by guess work and luck.
The right idea is to do a little reverse engineering first in order to trouble shoot with a little semblance of reason!

Ok, so no have no idea I’m not the engineer, e.g. why I posted my dumb luck first attempt in the 5 minutes to show my find.

Now I don’t care what the fix is, just fun to investigate.

kv

Edit: Last night was late, went to bed after that, now just showing it in real time. I’ll sit down and draw a feeble schematic. Unless someone can find one first.

 

You didn't say it was you in the Video !!?
I might not have been so harsh!

 

You didn't say it was you in the Video !!?
I might not have been so harsh!

Who else could it be some other D…..Sh…….no just little ol me.

kv

 

Without actually seeing the toaster and circuitry (a trip to the internet would be useful) I am going to guess the following:

The hold-down mechanism is a mechanical latch that is engaged manually.
The thermostat activates a solenoid to release the latch.
I suspect a shorted transistor that drives the solenoid.

 

Without actually seeing the toaster and circuitry (a trip to the internet would be useful) I am going to guess the following:

The hold-down mechanism is a mechanical latch that is engaged manually.
The thermostat activates a solenoid to release the latch.
I suspect a shorted transistor that drives the solenoid.

Remember I’m at work right now. So your on your own here until I get more time lol


Thank you for your contribution.

kv

 

Seems the guy does not really know what he is doing and trouble shooting by guess work and luck.
The right idea is to do a little reverse engineering first in order to trouble shoot with a little semblance of reason!

If you’ll notice I did say I needed to reverse engineer this circuit board at the end of the Vid.

Added some pics of the devices in the circuit. I wish could work more on this but, at work, tomorrow I’m off but have to help a friend move. I’ll do a circuit layout and attempt a drawing of it later.

Thx again,

kv

 

Might be one of these three, I’ll check later, found this and posted the URL in Post #1

kv

 

So, I think schematic 3 is closest to what I have

function of chip: Shorting RX to VCC is what I apparently seem to be doing lol

 

Without actually seeing the toaster and circuitry (a trip to the internet would be useful) I am going to guess the following:

The hold-down mechanism is a mechanical latch that is engaged manually.
The thermostat activates a solenoid to release the latch.
I suspect a shorted transistor that drives the solenoid.

Looking at the circuit posted it would appear that the solenoid is energized when the lever is pushed down.
The solenoid is de-energized to release the lever.

In either case, check the voltage applied to the solenoid in the down position.
Then check the voltage on the base and collector of the transistor.
Sounds like the transistor needs to be replaced.

 

Looking at the circuit posted it would appear that the solenoid is energized when the lever is pushed down.
The solenoid is de-energized to release the lever.

In either case, check the voltage applied to the solenoid in the down position.
Then check the voltage on the base and collector of the transistor.
Sounds like the transistor needs to be replaced.

After trying to gather how this thing works I came to that same conclusion, their is no Reheat button on my control board, but concluded that it’s all inside the latching contact at the Mag coil (Change my vernacular to solenoid. lol) when pressed starts the process. The cancel button interrupts the count down pulling the Transistor to ground which made sense, a set/reset flow, once this process is started either by me and my meter the RX to VCC still not sure yet? (Did you see a datatsheet for the A0201D cause I didn’t) I don’t have time to layout the circuit.

It all seems to works fine after I measure between the 2 points in the video, I was tempted to pull the Transistor and test it.

I’m not convinced it’s the Transistor yet, it’s as if something is limiting like dirty contact or something, I’ll need to solder some test points in the circuit, I don’t see where they are saying a mixed voltage? AC/DC unless the chip is providing it I guess.

Anyhow, have fun all, thanks again for looking at my little toaster issue. I’m tempted to put a switch in to get my toaster back lol

Bandaid it with a switch, rather than fix it.…. He he.

Thank you for your contribution.

kv

 

This is the best explanation so far, In this video we will overview what may be happening (still need further exploration) I’ll need to solder some test points to begin breaking it down hopefully, I will also pull and check the Transistor or just replace, not sure if I have one in my stock of parts.

Have to work today, yesterday was fun spending some time with a friend, finished his last move from his old business. He had some shelving his father installed in a personal shop in the rear of his old Maco Paint Shop in SLC just of 300 west and about 2700 south Salt Lake City.

Later, I also have a furnace repair I will post as well as a Boom Box a Bass Player friend wants me to repair.

kv

Edit: I found I will have to redo this video, the Transistor I thought was it, is a Regulator lol the SMD is a HJ6C transistor. I’m checking for equivalent transistors that might work from my stockpile.

 

Nothing in my pile will work, no surface mount transistors or even the regulator, I’m not willing to wait for them. A friend donated a toaster but it’s to big for the space, just going to purchase a new one.

Good luck on your repair at least you have more info than I did before I started.

Have fun, enjoy discovering new circuits.

kv