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Samson Servo 170/260 amp problems

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Samson Servo 170/260 amp problems

Postby TOMEISTER » Sat Sep 09, 2006 3:35 pm

Hi all,
On the older version of this forum there was a thread relating to a recurring problem with servo 170 and 260 amps. The problem is that one or both channels become intermittant/reduce vastly in level/stop working entirely. The problem is usually not permanent but is very annoying as the amp cannot be relied on to work all the time. The issue has occured in many units and is caused by the relay (that stops the power thump on turn-on) failing. See
Forum V2

On this thread the user 'Phattriff' mentions that he replaced the aforementioned relay with one from Maplin. I was wondering if anyone knew exactly which Maplin relay could be used or if anyone had used another source of replacement relays. The relay used in my unit appears to have a 24v coil voltage (I could be wrong on that though as its not clear from the casing) which very few relays appear to have. Any thoughts would be greatly appreciated.
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Re: Samson Servo 170/260 amp problems

Postby Frank Eleveld » Sat Sep 09, 2006 4:25 pm

If memory serves me right, the relays in the Samson Servo amps are made by Omron.

I also recall Digi-Key stocks them, but I don't have any product details nor order codes at hand.

Sorry, perhaps someone else has more info?

Frank
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Re: Samson Servo 170/260 amp problems

Postby SunShineState » Mon Sep 11, 2006 9:43 pm

I've replaced mine once - I think they are Omron too but I can't remember where I got them - I will try to find out.

However, the problem has come back again - I think the design promotes failure of the relays (or perhaps the relays themselves are crap at this particular job), so I'm very tempted to install a big double pole switch instead and use this to manually cut the signal during power up and down - anybody else done this - or think its a good idea?

Cheers
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Re: Samson Servo 170/260 amp problems

Postby Frank Eleveld » Tue Sep 12, 2006 6:48 am

Why not get a better amp in the first place? Those Samsons are cheap and cheerful and that's also how they sound.
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Re: Samson Servo 170/260 amp problems

Postby SunShineState » Tue Sep 12, 2006 8:33 am

Agreed - but that is what I'm stuck with and I don't have any money at the moment - what do you think about the switch in place of the relays?
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Re: Samson Servo 170/260 amp problems

Postby Frank Eleveld » Tue Sep 12, 2006 10:17 am

I would stick with the relays.
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Re: Samson Servo 170/260 amp problems

Postby SunShineState » Tue Sep 12, 2006 12:42 pm

Why?
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Re: Samson Servo 170/260 amp problems

Postby TraceElliot » Tue Jan 09, 2007 6:35 pm

Hi,

I have replaced the o/p relay on my servo 120. I'm certain the spec. of this will be very similar to the 170.

The original was a HANKUK HR-CR323 DC 024 TV-3

And this was replaced with a FINDER type 40.52s

Here in the UK it was difficult to find 6 pin relays with similar spec. so I used an 8 pin and carefully cut off the two unused pins to allow instalation of the relay.

I found that there was a choice of 4 or 5 different easy to find 8 pin equivalents that could be used.

All I had to do was match the coil resistance, working voltage and switch configuration of the relay.

Hope this is of help as this seems to be a very common problem with servo amps.

Anyway the relay cost me £2.80 and took less than 10mins to fit.

I phoned Samson UK to find out how much it would cost for them to fix it and it was going to come to just under £100 for the part, labour and carriage.

By the way, the engineer I spoke to had no problem at all emailing me a schematic diagram for the amp to help me trace the fault in the 1st place and was very helpful all in.

Thanks, Trace.
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Re: Samson Servo 170/260 amp problems

Postby sunny pedaal » Wed Jan 09, 2008 4:50 pm

hallo,
i have the same problems with both a 260 and a 170 samson.
is it please possible to sent me a copy of the scheme/ email of the amp + venetually some other useful info on how to fix it. would welcome it very much.
thanks beforehand,
sunny
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Re: Samson Servo 170/260 amp problems

Postby Dego » Tue Aug 30, 2011 9:14 am

I had this problem and had to change relay.

My original was a Meisei m4-24h (24V) in my old model of samson servo 120.
You can use these:
http://il.farnell.com/tyco-electronics/mt2-c93419/relay-pcb-dpco-24vdc/dp/9913696
http://il.farnell.com/omron-electronic-components/g5v-2-h-dc24/signal-relay/dp/9860584
https://www.elfa.se/elfa3~se_sv/elfa/init.do?item=37-057-20&toc=18794

The relays can also be found at mouser and digi-key.

As I understand the newer models of the servo called 120A uses 12volt relay.
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Re: Samson Servo 170/260 amp problems

Postby Steve D » Thu Feb 19, 2015 3:00 pm

Hi There,

An old thread but still my current problem.

I have a broken Servo 260 amp with the same issues as described above. I have replacement relays at the ready but I don't know how to replace them. The original is a HANKUK HR-CR323 DC 024 TV-3 and the new ones I have are TE CONNECTIVITY - MT2-C93419. The problem is I'm new to electronics so everything is a bit of a mystery.
My questions are:
how do I remove the original?
how (and in which orientation ) do I fit the new one(s)?
Is the 8/6 pin thing an issue?

Anyone out there that can help me?

thanks in advance.

Steve
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Re: Samson Servo 170/260 amp problems

Postby Folderol » Thu Feb 19, 2015 5:44 pm

Good lord! It's a Zombie :shock:


Before changing the relay, have you tried prising the top off and then cleaning the contacts?

Removing something like a relay can be quite tricky. The safest way is to carefully break it up in situ, leaving just the pins in the PCB, then taking out each pin one at a time using a well heated soldering iron, a bit of extra solder and a pair of tweezers or fine pliers. You'll then need solder wick or a solder sucker to remove excess solder and clear the holes.

If the new relay has the same footprint and contact orientation, you can just drop it in. If not, the easiest work-round is to solder short solid-core wires to the wanted pins then bend them to match the PCB configuration.

P.S.
You can work out the configuration of the old one quite simply when you remove it, and you should be able to find the pin-out for the new one from wherever you got it.
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