When is a 3k9 not a 3k9 ? - diyAudio
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Old 15th September 2014, 04:44 PM   #1
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Default When is a 3k9 not a 3k9 ?

Just got a components order from Farnell.
I soldered all the components in 3 pcb's.
I tested the pcb's and none worked.
I buzzed out all the resistors only to find 2 were 1k5 instead of 3k9.
The order number is right and the value on the packet is right but the component inside is wrong.
Farnell want me to send the 55p resistors back via UPS and wait in all day until UPS arrive to collect them !
So I am out of pocket by a couple of hours plus the day I have to wait for UPS.
My next order will be from RS Components !

If I cant rely on the right components I am wasting my time.

Just opened up some 100uf capacitors to find the are 0r1 resistors !
I have had to cut out and replace 6 1k5 resistors.
What a mess !
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Old 15th September 2014, 04:50 PM   #2
Mooly is offline Mooly  United Kingdom
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I've had very occasional similar experiences from CPC which is part of Farnell of course. Mine were crazy, a 3 way mains socket for what should have been some small component.

It happens and I'm sure they will correct the error. A couple of years ago I picked up a voltage reference IC from the trade counter (SMD, the size of a grain of rice) and when I got it home I found the SMD part had been snipped from a tape reel and the part chopped in half. Rang them up and they sent a new part via carrier in a box that was probably twice the size of a shoe box and filled with one 0.70 part of miniscule size.
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Old 15th September 2014, 04:55 PM   #3
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I also deal with RS and they sometimes have a component missing.
I would rather it was missed than was a wrong value.

Luckily for Farnell I was only building 3 pcb's and not 3,000 or I would have been up the creek without a paddle.
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Old 15th September 2014, 05:12 PM   #4
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Sounds similar to the time I tuned a 3-way 24dB Sallen-Key crossover to use 4.7k resistors, paralleling two for the 2.35k values, and Digikey sent me a bunch of 7.5k's (marked 4.7k on the packing list). They were little 1/4W leaded metal film jobs so they have color coded bands but they're so small I didn't notice the secret swap until after I built the filter board and everything was whacked out. In short, everyone makes mistakes. Can't wait for the robot revolution.

Last edited by Andrew Eckhardt; 15th September 2014 at 05:17 PM.
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Old 15th September 2014, 05:39 PM   #5
osscar is offline osscar  Latvia
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I have had a similar situation with one supplier, but I will eliminate at the right time - as I always check resistors and transistors before soldering with a multimeter.
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Old 15th September 2014, 05:55 PM   #6
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I once had two cases where a reel of wrong value capacitors had been added to a pick and place machine. The reel in both cases had the wrong label on it and the machine just went on putting the wrong part in as you would expect.
SMD capacitors rarely have values printed on them making it more difficult to find out what was wrong.
There was plenty of overtime with lots of money and no time to spend it.
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Old 15th September 2014, 07:44 PM   #7
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This is rather different from my experience with Farnell. I ordered three sets of storage drawers and one arrived with one of the 42 plastic drawers broken. I asked for a single replacement drawer but once they had established that it wasn't likely to be transit damage they said it was below their cost threshold to return so they would just send me another full set - at which stage I stopped saying that it all sounded rather wasteful and was glad of the customer care.

I wonder if they want the 55p resistors back in case it uncovers a bigger problem with a supplier or their warehouse.

Sadly wildly excessive packaging seems endemic - I always praise Ebay sellers that use an adequate amount of material but no more.
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Old 15th September 2014, 08:02 PM   #8
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Our purchasing agent at work one time tried to order some Fuji parts from MCM and got a plastic soap dish instead...
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Old 15th September 2014, 09:56 PM   #9
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Quote:
Originally Posted by osscar View Post
I have had a similar situation with one supplier, but I will eliminate at the right time - as I always check resistors and transistors before soldering with a multimeter.
Whoa, soldering with a multimeter??
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Old 15th September 2014, 10:05 PM   #10
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