Need Electronics HE...
 

Need Electronics HELP .... DAYSTATE MK-3 PC board likely needs a new capacitor  

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Motorhead
(@motorhead)
Member of Trade
Joined: 3 months ago
Posts: 51
2019-06-28 13:31:10  

My ever reliable Mk3 with 12 step power is sick ... Not a battery issue, but one of the gun no longer wants to make any power ( resealed and check the valve etc ... mechanically sound )

At max power setting it simply won't get to where it would previous, stepped down it does go lower.  My thoughts are the Capacitor is likely failing and simply won't charge up correctly and release the current required to fire the solenoid correctly.

 

DO ANY OF YOU have any experience in such matters ?

 

 The Capacitor is marked : Hi-ripple 63V 2200 uf  25/085/21  1430 having the # RT-12 on the top end.

 

Help if you can ?

 

Thank you,

Scott S

Home of ... MOTORHEADS AG TUNING SERVICES
................... @ Northern California USA ....................
Sacramento Valley Field Target Club SVFTC Scott S


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marflow
(@marflow)
Joined: 2 years ago
Posts: 632

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Motorhead
(@motorhead)
Member of Trade
Joined: 3 months ago
Posts: 51
2019-06-28 14:55:13  

DSCF0747
DSCF0746
DSCF0744

 

here we go ... tad over 25mm diameter X a tad over 26mm tall

Home of ... MOTORHEADS AG TUNING SERVICES
................... @ Northern California USA ....................
Sacramento Valley Field Target Club SVFTC Scott S


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marflow
(@marflow)
Joined: 2 years ago
Posts: 632
2019-06-28 18:28:37  

https://www.amazon.com/Hitachi-HU3-2200uF-Electrolytic-Capacitor/dp/B00AM48USI/ref=sr_1_5?keywords=2200uf+63v+capacitor&qid=1561762238&s=industrial&sr=1-5

this might be a winner

I'm a little light a capacitor knowledge and the deeper I dig the more confused I get

High ripple = surge current

105c seems to be the top of temperature range

the sizes are all over the place and I'm guessing this is a two solder point capacitor

so with that said, maybe the Hitachi would work

good luck I gave it a try

Mike


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Skip in WV
(@skip-in-wv)
Joined: 2 years ago
Posts: 71
2019-06-28 19:08:18  

Mouse electronics should have what you need. mouser.com


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Motorhead
(@motorhead)
Member of Trade
Joined: 3 months ago
Posts: 51
2019-06-28 22:43:12  

Thank you to all .... I have a lot more information than i can digest, so my fishing for a cure will continue in silence.

We're good for now ... thank you.

Scott

Home of ... MOTORHEADS AG TUNING SERVICES
................... @ Northern California USA ....................
Sacramento Valley Field Target Club SVFTC Scott S


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awilde
(@alex-from-upstate-ny)
Joined: 2 years ago
Posts: 118
2019-06-29 08:23:59  

You might try wiggling those various molex connectors as well to see if any wires or pins have come loose/broken or developed some oxidation/corrosion on the contacts. Could also try giving the whole board a scrub down with higher purity IPA to clean up any leftover flux or built up gunk from over the years (analog circuits/components can be particularly sensitive to these). Both are a little simpler and non-invasive checks that can sometimes resolve a problem before going in hot and heavy for debugging.


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marflow
(@marflow)
Joined: 2 years ago
Posts: 632
2019-06-29 14:37:48  

would a cleaner like Deoxit work as, use for cleaning stereo pots

Mike


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SteveUK
(@steveuk)
Joined: 1 month ago
Posts: 2
2019-08-09 08:04:16  

@motorhead

If that 07/03/07 is the date stamp, then that electrolytic capacitor is going to be way out of spec

A quick test is to solder another capacitor of similar value and voltage rating to the leads of the original (same polarities) - if trigger now works correctly, then original capacitor is bad

A better test is to buy a cheap "atmega transistor checker" from Amazon, eBay, AliExpress, etc. - does way more than check transistors - it will test the unsoldered capacitor for capacitance, and ESR - ESR is the killer - it must be within a certain range - it is also what kills rechargeable batteries

Another thing to check is the voltage on the capacitor - it should charge up to 69 or 70 volts on this circuit board

 


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SteveUK
(@steveuk)
Joined: 1 month ago
Posts: 2
2019-08-09 08:16:35  

Simple explanation of ESR - the capacitor has an internal resistance that prevents it working correctly

A capacitor tester will not show it, and say the capacitor is good (high capacitance) - but an ESR meter puts a high frequency on the capacitor leads and then tests it


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