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Author Topic: Help with part ID  (Read 859 times)

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Offline scrubbaTopic starter

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Help with part ID
« on: January 13, 2021, 06:35:44 pm »
Having trouble identifying and locating source for electronic component from a sewing machine. It looks like a mini transformer and only marks on it read TYP 90 40/96. Any help would be greatly appreciated. Thanks for reading.
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Offline bob91343

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Re: Help with part ID
« Reply #1 on: January 13, 2021, 07:39:05 pm »
Common mode choke?
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Offline scrubbaTopic starter

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Re: Help with part ID
« Reply #2 on: January 13, 2021, 08:13:18 pm »
I'll try researching common mode chokes. Thanks for your input.
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Online Grandchuck

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Re: Help with part ID
« Reply #3 on: January 13, 2021, 08:54:32 pm »
Common mode chokes are often used to suppress line noise.  They are used in conjunction with two more capacitors.  This looks different to me.  But, I don't have a better idea.
Can you determine what it is connected to? 
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Offline scrubbaTopic starter

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Re: Help with part ID
« Reply #4 on: January 14, 2021, 12:51:59 am »
Thanks for your help. The traces from the four pins of this component lead to resistors, a capacitor, and a diode. (as far as I can tell with my limited knowledge)
« Last Edit: January 14, 2021, 01:02:53 am by scrubba »
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Offline scrubbaTopic starter

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Re: Help with part ID
« Reply #5 on: January 14, 2021, 12:59:02 am »
One more pic from the other side ...
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Offline bob91343

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Re: Help with part ID
« Reply #6 on: January 14, 2021, 01:06:08 am »
It appears that the component designations are marked on the board.  Is there one for this component?  Often the prefix is a clue.  Q = transistor, R = resistor, D = diode, etc.

Looks like U145...
« Last Edit: January 14, 2021, 01:08:10 am by bob91343 »
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Offline scrubbaTopic starter

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Re: Help with part ID
« Reply #7 on: January 14, 2021, 01:09:10 am »
I think it's U145.
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Offline JohnnyMalaria

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Re: Help with part ID
« Reply #8 on: January 14, 2021, 01:16:57 am »
Looks like this board (top left): https://www.drdanessmh.com/berninahelectronbds1.html

You can buy the service manual for $12: https://berninamanuals.com/Bernina_Service_Manuals.htm
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Offline scrubbaTopic starter

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Re: Help with part ID
« Reply #9 on: January 14, 2021, 01:29:26 am »
Thank you for your suggestions and links. The board pictured says its for a model 1090. I'm not sure if it'll work for a 1260 which is what I'm trying to repair. I have also looked at boards for a model 1230 on ebay, which are similar, but have slight differences in the circuitry.
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