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Help needed!! / Isomac Tea /TROUBLESHOOTING / Relay or brainbox
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Discussions > Espresso > Espresso Mods > Help needed!! /...  
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ChrisInked
Senior Member
ChrisInked
Joined: 10 Jan 2014
Posts: 16
Location: Montreal
Expertise: I love coffee

Espresso: Isomac Tea v1
Grinder: Compak K3 Touch
Posted Mon Feb 10, 2014, 9:13pm
Subject: Help needed!! / Isomac Tea /TROUBLESHOOTING / Relay or brainbox
 

Hi guys! :) I'm hitting my limits now and it's kinda killing me!

I recently got myself an 8 years old Isomac Tea, and upon arrival home and trying the little mirorbox fail to reach proper pressure... So I did wath had to be done, grand menage.
But after rebuilding everything, I'm having some issues somewhere in between the Crouzet relay and the Giemme controller...

So here the spec:

Brand: Isomac
Model: Tea 110V
Year: ?? ( how can I find?..)

Everything works on the machine except the heating element won't start as the Crouzet relay's not kicking in... an of course the front red light stay off... as well as the little green led on the relay...

I read a lot of stuff around and some poeple also talk about a relay on the controller board that get stuck, and i wanna make sure I buy the right part.

I took some readings, and did some bypass connection to see some section of the circuit functionnability...

The heating element is ok, when plugged directly it heat fast. In about a minute I could hear the water crackling in the tank. It also read 10,5 ohms of resistance.

I bypassed the Pstat and it's not the cause...

Here are the readings at the crouzet's contact with first the ground then with the common.

           GROUND                   COMMON

L1______118,5V________________0_____

T1________0________________118,5V___

A1______110,5V______________17,2V___

A2______118,5V________________0_____


Ok then I think it's all there! Thanks forward!!! :)  And if you need info about the machine's part model or want me to trow an eye on something for you, just ask :)

C.
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dana_leighton
Moderator
dana_leighton
Joined: 11 Jan 2002
Posts: 1,911
Location: Little Rock, AR
Expertise: I live coffee

Espresso: Isomac Relax; Caferina...
Grinder: Macap MXK; Baratza Vario-W;...
Vac Pot: Yama 5-cup
Drip: Technivorm; CCD; Melitta
Roaster: Poppery I w/PID controller
Posted Tue Feb 11, 2014, 5:46am
Subject: Re: Help needed!! / Isomac Tea /TROUBLESHOOTING / Relay or brainbox
 

Have you checked the output from the Giemme box as in this recent thread?

 
Dana Leighton - Espresso hack and CoffeeGeek moderator
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ChrisInked
Senior Member
ChrisInked
Joined: 10 Jan 2014
Posts: 16
Location: Montreal
Expertise: I love coffee

Espresso: Isomac Tea v1
Grinder: Compak K3 Touch
Posted Tue Feb 11, 2014, 6:38am
Subject: Re: Help needed!! / Isomac Tea /TROUBLESHOOTING / Relay or brainbox
 

Hi Dana, and thanks a lot for your help!

Yes I did, (wich is the same as A1 to common, and I read 17,2V)

Would it be the internal giemme box relay not switching to full power or the transformer?...

This is the diagram I did of the wiring before unplugging everything, tell me is it ok?

ChrisInked: photo copy.jpg
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ChrisInked
Senior Member
ChrisInked
Joined: 10 Jan 2014
Posts: 16
Location: Montreal
Expertise: I love coffee

Espresso: Isomac Tea v1
Grinder: Compak K3 Touch
Posted Tue Feb 11, 2014, 10:21am
Subject: Re: Help needed!! / Isomac Tea /TROUBLESHOOTING / Relay or brainbox
 

Ok so new updates... :)

opening the giemme box I looked everywhere for burned out resistor or caps, knocking both relay trying to un-stick'em, and then I realized that the little paper connector that connect both board together seemed kinda ripped... and looking through a magnifier, yep, it is, especially the #4 (the lowest on the picture) and it connect directly to the Giemme SPDP relay, ... hum....and then pulling it gently apart... that's what happened! ...

Hope I found it since the machine was heating perfectly before dismounting..

I'll fix that later on today and keep you update of result :)

ChrisInked: IMG_5159-2.jpg
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ChrisInked
Senior Member
ChrisInked
Joined: 10 Jan 2014
Posts: 16
Location: Montreal
Expertise: I love coffee

Espresso: Isomac Tea v1
Grinder: Compak K3 Touch
Posted Tue Feb 11, 2014, 9:58pm
Subject: Re: Help needed!! / Isomac Tea /TROUBLESHOOTING / Relay or brainbox
 

I fixed the broken cable and still no power to the element... but I also noticed that 2 of the 3 bc547b transistor had 1 broken leg...so I'm oplanning a tripp to Addison electronic tomorow, they have those for 39 cents each... we'll see!
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dana_leighton
Moderator
dana_leighton
Joined: 11 Jan 2002
Posts: 1,911
Location: Little Rock, AR
Expertise: I live coffee

Espresso: Isomac Relax; Caferina...
Grinder: Macap MXK; Baratza Vario-W;...
Vac Pot: Yama 5-cup
Drip: Technivorm; CCD; Melitta
Roaster: Poppery I w/PID controller
Posted Tue Feb 11, 2014, 10:26pm
Subject: Re: Help needed!! / Isomac Tea /TROUBLESHOOTING / Relay or brainbox
 

If you're having fun fixing the box that's great. My experience was that it is, after all, 8 year old electronics and likely that if you fix one thing something else in the Giemme box will go bad before too long. A replacement box would likely be the less frustrating option if you're planning to keep the machine in service for a while.

Have fun and good luck!

 
Dana Leighton - Espresso hack and CoffeeGeek moderator
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ChrisInked
Senior Member
ChrisInked
Joined: 10 Jan 2014
Posts: 16
Location: Montreal
Expertise: I love coffee

Espresso: Isomac Tea v1
Grinder: Compak K3 Touch
Posted Tue Feb 18, 2014, 8:14am
Subject: Re: Help needed!! / Isomac Tea /TROUBLESHOOTING / Relay or brainbox
 

Hi all, just wanna tell you now that the machine works like a charm!!!  and it only cost about me about 2$ taxes included. Now I'm crossing fingers hoping for the Giemme not to fail! :) I reajust the presurestat range between 1.1 and 1.4bar, OPV at 10bar had no leaks, and everything seems perfect!

Thanks all for your time and advices!!

Chris
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