Identifying capacitors -- need help! :)

[godfrey]

Hello capacitor geeks!

I am repairing an HP Designjet 4200 42" scanner.  After multiple through hole capacitors failed on the power supply board and this thing has over 30,000 hours powered on -- I figured I'd just replace all the capacitors on the boards.  It does currently function, but there's no telling how long that'll last...

I need help identifying these SMD caps.  I know each manufacturer has their own coding scheme -- so I'm at a loss.

Every cap has values like;

47
CHB
2U6

241
22
6E

330
6A
1N8

100
JHB
2U5

But I'm at a loss as to what's what.  Attached are some images of the caps.  Could someone explain what these mean?


Thank you in advance,


Phil

[DmitryL]

... let me google for you... "smd electrolytic capacitor"

[Kjelt]

I need help identifying these SMD caps.  I know each manufacturer has their own coding scheme -- so I'm at a loss.
Every cap has values like;
47
CHB
2U6
But I'm at a loss as to what's what.  Attached are some images of the caps.  Could someone explain what these mean?

You have to find the correct manufacturer and series to be sure about the meaning.
This depends on the manufacturer and an example is given below for the Panasonic HB series electrolytes  .
Usually:
First value is the capacitance in uF's
Second are the Voltage rating and the series of the manufacturer
So you have to google or try farnell/mouser etc. to find the correct manufacturer and download the datasheet, try HB series electrolytes for instance.

PS: to get less sarcastic answers as the one above you better post in the "beginners" section of this forum 

[Wh1sper]

If it works, let it in peace.
smd CAPs unsoldering and soldering is a lot of work, many caveats are there.
Chances are high that these capacictors are working for another 30,000 hours.
In Powersupplies are more heavy environment disturbance, so to say. at the PCB in photo it seams they are all PS bocking Caps so leave them alone until you have trouble

[godfrey]

Thanks for the replies.  I have determined these are Panasonic brand capacitors.  As far as replacing them, it's super easy for me.  Just twist, grab the leads off the board with your iron and resolder.  I used to work at a broadcast repair company with three other techs -- one guy averages about 50,000 of these a year because they go bad so often when equipment has high hours.

[Evil Lurker]

If they are pannies I second the motion of leaving them alone. Panasonic IMO probably makes the best electrolytic capacitors on the market today, with perhaps Nichicon running a close second. Getting SMD electrolytic chip capacitors off can be a real pain sometimes and I would not want to risk lifting a pad or damaging a trace on some sort of logic/controller board that is still functional. PSU output filter caps on the other hand, yeah I'd say they might need to go.

[Wh1sper]

I used to work at a broadcast repair company with three other techs -- one guy averages about 50,000 of these a year because they go bad so often when equipment has high hours.

Ohh 

[godfrey]

The value does not match the actual checked value of the capacitor out of circuit.  Low ESR on many of them when tested with an ESR meter.

Fortunately, there are only 45 caps in total…unlike the hundreds that are in Panasonic DVCPRO and Sony DV editing decks.