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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 12th Jun 2019, 1:26 pm   #1
Scimitar
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Default Need component identification please

I have just stuffed my bike radio and looking on the control board for clues. What would you say this component was? I know what I think it is, but before I do anything else, I wanted a second opinion. Meter reads open circuit, no initial response on connecting the test leads. Voltage either side differs.
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Old 12th Jun 2019, 1:28 pm   #2
Martin G7MRV
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Default Re: Need component identification please

Crystal or ceramic resonator
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Old 12th Jun 2019, 1:29 pm   #3
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Default Re: Need component identification please

Not what I thought it was then! Thanks.
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Old 12th Jun 2019, 1:37 pm   #4
Martin G7MRV
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Default Re: Need component identification please

Bet you thought it was a fuse?

I've seen crystals and fuses in exactly the same size and shape packages at this size! The give away is that it's right up by a big IC, presumably a custom microcontroller. You'll most likely find that it connects to two of that chip's pins.
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Old 12th Jun 2019, 2:54 pm   #5
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Default Re: Need component identification please

I hoped it might be a fuse, but SMD fuses seem to be always square section rather than tubular.

I am stuck now, I don't know if it is the radio or the control head at fault. Secondhand they are 200 each so not sure what to do about it. The equipment is made by Becker and it is a Professional 2000 CD/Radio with separate controls. Very similar to BMW cars E36 onwards.
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Old 12th Jun 2019, 2:58 pm   #6
Martin G7MRV
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Default Re: Need component identification please

I think square section fuses are more common than the round ones, and likewise round crystals more common than the square ones! But then crystals and resonators come in all manner of rectangles, cylinders, etc

I once had to repair a transceiver with a round crystal, a round fuse, and several MELF power resistors all on the same sub-PCB!
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Old 12th Jun 2019, 3:02 pm   #7
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Default Re: Need component identification please

Have you stuck a scope on it to see if anything plausible is on there?

I agree with Martin that the location suggests a crystal of some kind although tbh, I've also never seen one quite like that. Too much contact surface area that could radiate HF noise. Could it be some kind of backup device (although again, never seen one like that)?
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Old 12th Jun 2019, 5:28 pm   #8
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Default Re: Need component identification please

I agree. Location suggests a crystal or ceramic resonator for clocking a chipful of logic. I too have never seen one in that package. There are often two chip capacitors associated with them.

Becker make good quality stuff (and I design stuff in competition with them)

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Old 12th Jun 2019, 5:53 pm   #9
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Default Re: Need component identification please

It's a Murata CSAC series ceramic resonator (date coded 'G' = July 2013 / July 2017).

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Old 12th Jun 2019, 6:49 pm   #10
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Good detective work, I can't say I've ever come across that outline before
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Old 12th Jun 2019, 7:10 pm   #11
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Default Re: Need component identification please

Quote:
Originally Posted by Trigon. View Post
It's a Murata CSAC series ceramic resonator (date coded 'G' = July 2013 / July 2017).

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Cheers
The controller is original to the bike and is a 2004 reg, so your date may be a tiny bit out.
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Old 12th Jun 2019, 7:11 pm   #12
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Default Re: Need component identification please

Quote:
Originally Posted by Radio Wrangler View Post
I agree. Location suggests a crystal or ceramic resonator for clocking a chipful of logic. I too have never seen one in that package. There are often two chip capacitors associated with them.

Becker make good quality stuff (and I design stuff in competition with them)

David
Yes there were two chip capacitors behind it. Sort of gives the game away once you calm down enough to think it through!
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Old 12th Jun 2019, 7:15 pm   #13
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Default Re: Need component identification please

Quote:
Originally Posted by Scimitar View Post

The controller is original to the bike and is a 2004 reg, so your date may be a tiny bit out.
Apparently then the four year date cycle goes back further than it did in the document I found. Must be July 2001 !

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