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Author Topic: Sunbeam EM4800C repair  (Read 35841 times)

UNM

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Sunbeam EM4800C repair
« on: 17/06/2011, 03:06 PM »
Just picked up a sunbeam em4800. Not the highest spec machine, but the price was right (free). Apparently there is a problem with the pump and I happen to have a spare ulka ep5...

I don't know if anyone here has ever worked on these, but if so and there are any gotchas, please let me know. So far it looks pretty straightforward, but I haven't taken anything apart yet.

And I have now seen my first pressurised filter basket!


"There is never interpretation, understanding and knowledge when there is no interest,"
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Bean Flying

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Sunbeam EM4800C repair
« Reply #1 on: 17/06/2011, 05:31 PM »
Haven't used one but from what I have read fitted with a non pressurised basket they make a fairly decent shot.

Just play carefully around water and electricity, the two mixed are a very bad idea  ;). And to this make sure you are using an earth leakage connected power point or power board for a little more protection when firing up unknown appliances for the first time.

UNM

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Sunbeam EM4800C repair
« Reply #2 on: 18/06/2011, 10:50 AM »
 Actually mixing water and electricity can be a good thing, depending what you want to achieve snd with who  ;)

An earth leakage breaker on the main distribution panel  is a given - any appliance can go bad any time.

Pulled the back off last night and that gives good access.  A bit of testing and can hopefully power up and find if it really is the pump, or a blockage.

Then I can give it away to someone in need.
"There is never interpretation, understanding and knowledge when there is no interest,"
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UNM

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Sunbeam EM4800C repair
« Reply #3 on: 19/06/2011, 07:17 PM »
Well I did some testing and then cranked it up last night - pump sounded iffy. Changed for a spare and all working within 5 mins so it was as easy as I hoped.

Will play with it for a couple days and then pass it on to somebody deserving.

"There is never interpretation, understanding and knowledge when there is no interest,"
Edward Said

UNM

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Sunbeam EM4800C repair
« Reply #4 on: 19/06/2011, 09:13 PM »
Well done, and I like the pay it forward outcome..

Just makes sense since nobody wanted my pump which was on there for a long time (along with thermostats and various bits and pieces). This way I get to play and we get 1+1 >= 2


The quandary is whether to convert the pressurised baskets to unpressurised. I think I'll wait and see who wants the machine - while it would be nice to encourage people to use real coffee, some may be quite happy with less.
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Koffee Kosmo

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Sunbeam EM4800C repair
« Reply #5 on: 19/06/2011, 09:16 PM »
Does anyone want a small Breville
I think its a Cafe Roma
My sister in-law gave it to me & said that it works fine but has a crack on the plastic case of the top rim

I am keeping the 2 cute espresso cups  ;D ;D

KK
Bezzera Strega Lever: Mazzer Robur conical grinder Pullman Barista Tamper Convex:  Designer of the KKTO Home Roaster:

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UNM

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Sunbeam EM4800C repair
« Reply #6 on: 14/07/2011, 05:14 PM »
When I got back from hols, I fired up this new toy with the last beans I had sitting at home (old). Shot poured really quick (not sure I had the grind right), but ' crema' from start of the pour and it looked blonde immediately. Crema texture was weird.
I can't seem to get decent steam. If I go immediately from pour to steam, I get 10 seconds or so of steam, then have to switch back to pour again if I want more. Is this normal for a single thermoblock? Shouldn't it engage the pump intermittently while steaming to keep  the block producing steam?
"There is never interpretation, understanding and knowledge when there is no interest,"
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UNM

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Sunbeam EM4800C repair
« Reply #7 on: 17/07/2011, 02:01 PM »
I have lots of EM4800C parts about  ;D

1: In steam mode it should be Pumping and Steaming..

But never pour a shot straight after Steam, as the GH is too hot and you will destroy even the best beans...  Flush a few times and then do your shot.

2: If the pump is not working when in steam mode, then one of the sensors or switches is not behaving correctly..

How close to me are you ?

Not very , SE Melbourne.
I'll have a play around and see if I can work out what it's wrong. Knowing how it should work is half the  battle.
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Tango

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Sunbeam EM4800C repair
« Reply #8 on: 18/07/2011, 09:34 AM »
I've got an EM4800 too and I've found with unpressurised baskets and a decent grinder (BCG 800) that I can get some decent shots.  Need to purge a fair bit of water through it though, as often the first bit of water coming out is waay too hot.

Having said that though, mine just went bung over the weekend!  There's a crack in the black plastic group head lock which causes water and coffee to go spurting out when pressure builds up.

AM - you wouldn't happen to have a spare group head lock lying around would you???

It's either replace the group head or upgrade......hmmmm.

Tango

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Sunbeam EM4800C repair
« Reply #9 on: 18/07/2011, 03:40 PM »
AM,

You're a legend!!!!  PM on the way!


Tango

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Sunbeam EM4800C repair
« Reply #10 on: 21/07/2011, 07:04 AM »
Will be posted to day.

Thanks AM - any chance you could please send it express?  I'll of course reimburse you the full cost!

UNM

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Sunbeam EM4800C repair
« Reply #11 on: 29/09/2011, 11:27 AM »
After a (not so) brief hiatus, spent a short while working on my pair of 4800C's yesterday.

I now have Tango's old one as well as the other.

Two machines, two problems.
Machine 1: when steaming, pump doesn't operate at all
Machine2: group seal not sealing well.

So this SHOULD let me troubleshoot and end up with two good machines relatively easily. First up is to fix machine1.

I suspected the circuit board as switches and thermostats all tested OK.
Swapped 'suspect' circuit board into machine2. Everything worked - pump pulses while steam switch engaged.
Swapped board back to machine2 - no pump.
Swapped out steam microswitch, even though it seemed OK - no change.
Tested thermostats again, all seems well.

Not sure what to check next. Will give it some thought, but any ideas are welcome.

Oh yes, machine1 circuit board has date of 2001, machine2 has date 2004, but same connections on each.
"There is never interpretation, understanding and knowledge when there is no interest,"
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Sunbeam EM4800C repair
« Reply #12 on: 29/09/2011, 01:45 PM »
After a (not so) brief hiatus, spent a short while working on my pair of 4800C's yesterday.

I now have Tango's old one as well as the other.

Two machines, two problems.
Machine 1: when steaming, pump doesn't operate at all
Machine2: group seal not sealing well.

So this SHOULD let me troubleshoot and end up with two good machines relatively easily. First up is to fix machine1.

I suspected the circuit board as switches and thermostats all tested OK.
Swapped 'suspect' circuit board into machine2. Everything worked - pump pulses while steam switch engaged.
Swapped board back to machine2 - no pump.
Swapped out steam microswitch, even though it seemed OK - no change.
Tested thermostats again, all seems well.

Not sure what to check next. Will give it some thought, but any ideas are welcome.

Oh yes, machine1 circuit board has date of 2001, machine2 has date 2004, but same connections on each.


could be a descale problem as a build-up of calcium deposits can inhibit water flow

have you tried removing the shower screen and having a good go with either pipe cleaner or pressurised water to clean the water line out?
"The crema which dissipates is not the lasting crema..."

UNM

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Sunbeam EM4800C repair
« Reply #13 on: 29/09/2011, 03:54 PM »
Surely the pump would still try to operate? Also water flow when pulling a shot is fine. Don't know if the water path for steam is different to brew. Worth descaling anyway. Is citric acid ok if rinsed thoroughly? Dont have anything else to hand.
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Kelsey

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« Reply #14 on: 04/10/2011, 03:55 PM »
Sorry to barge in (mods, feel free to move to a new thread if this derails the original) but I'm also having a problem with my 4800.

As mentioned on a previous post today, my group seal gave out. It's been replaced, but I'm still getting the odd spurt of water over the top of the portafilter and a fair amount of additional dripping which wasn't happening before.

I'm hard-locking the handle to the right and I don't think I'm overdosing....

Any ideas?
LONDINIUM I, Compak E10.

Full disclosure: I have commercial arrangements with Bezzera (AU) and Londinium Espresso. I am not required to market them on this forum & any opinions expressed are my own.

Brett H

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« Reply #15 on: 04/10/2011, 04:10 PM »
The collar sounds like it might be scored or cracked Kelsey.  Why not try some sort of gasket/spacer or one of Chris' Bezzeras as a quick fix. 

Umn, despite the warnings I've used citric (10ml/l dissolved in a cup of hot water first) for years. I was also recommended it by a staff member at Di Bella recently.  The only issue is that the 'sand' doesn't completely dissolve and may cause hassles further up the line if there are restrictions.
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Kelsey

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« Reply #16 on: 04/10/2011, 04:20 PM »
Thanks Brett, I think the Bezzera fix sounds like a solid plan. ;)

I'll take a look at the collar while I'm at it tho....
LONDINIUM I, Compak E10.

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Kelsey

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« Reply #17 on: 04/10/2011, 07:02 PM »
Hi AM - was this directed at me? I wouldn't want to presume, given I've barged in on this thread... ;)
LONDINIUM I, Compak E10.

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UNM

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« Reply #18 on: 04/10/2011, 09:03 PM »
Hi AM - was this directed at me? I wouldn't want to presume, given I've barged in on this thread... ;)

Barge away. I got no problem with others troubleshooting their 4800C's. I might even learn something about the two I currently have. Not made any time to work on them again yet.
"There is never interpretation, understanding and knowledge when there is no interest,"
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Kelsey

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« Reply #19 on: 05/10/2011, 10:38 AM »
So not so lucky after all. :(

Replaced the seal and steam/water mist still blew out the top of the portafilter.

I removed the showerscreen and inspected the seal - looked fine, so I removed what I *think* is the collar (sunbeam calls it the 'brew head lock') - the black plastic thing that has 'Insert ----> lock' (or something similar) printed on it. Took that off - found that the base of it that should be flush with the machine was absolutely impacted with grinds from the explosion, so cleaned that thoroughly.

I couldn't see any cracking or obvious damage to the collar itself.

So I'm now wondering if we're installing the seal wrongly.... surely there should only be one obvious way?
LONDINIUM I, Compak E10.

Full disclosure: I have commercial arrangements with Bezzera (AU) and Londinium Espresso. I am not required to market them on this forum & any opinions expressed are my own.

Kelsey

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« Reply #20 on: 05/10/2011, 01:54 PM »
 :D As soon as I wrote that I thought to myself, "we're talking about coffee machines here, of course there's something non-obvious going on".

I did notice that the green-tinged prideful place had a mention of Krups seals apparently fitting better than Sunbeam ones....
LONDINIUM I, Compak E10.

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« Reply #21 on: 05/10/2011, 02:32 PM »
Thanks AM - when I get back from the office I'll make a comparison.

I've got the Krups basket already, but don't really like it. It's better than the pressurised baskets, but the holes are bloody huge - even the coarsest of grinds leave fines in the cup.
LONDINIUM I, Compak E10.

Full disclosure: I have commercial arrangements with Bezzera (AU) and Londinium Espresso. I am not required to market them on this forum & any opinions expressed are my own.

Brett H

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« Reply #22 on: 05/10/2011, 04:56 PM »
Thanks AM - when I get back from the office I'll make a comparison.

I've got the Krups basket already, but don't really like it. It's better than the pressurised baskets, but the holes are bloody huge - even the coarsest of grinds leave fines in the cup.

May be time to cut your losses mate. I had this idea that I was going to buy a fix-er-upper machine and recondition it saving all this money.  Turns out what I really wanted was a coffee.  Thus... spent a bit more than I planned an finally got a coffee.  I still tell my wife we could have the best tent in the caravan in the park with a SLAYER!!!!  I've made the shed quite comfortable for when she finally tires of me.
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« Reply #23 on: 05/10/2011, 05:03 PM »
Unfortunately I'm compelled to fix this one (or replace it) no matter what as it's a loaner. Not sure they'll ever want it back, but I don't want to hand them back a broken machine if they do ask for it....

That said, the problems are bugging my wife almost as much as myself.... Can I smell a new purchase in the offing? ;)
LONDINIUM I, Compak E10.

Full disclosure: I have commercial arrangements with Bezzera (AU) and Londinium Espresso. I am not required to market them on this forum & any opinions expressed are my own.

Koffee Kosmo

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« Reply #24 on: 05/10/2011, 05:07 PM »
Just remember what I said on another thread re purchase
Quality and price
Constant repairs or years of reliability

You could also make me an offer on the BZ40
Then I can go and get my plumbed in Strega Lever Machine
KK
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MinistryGrounds

 

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