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Joined: Apr 2007
Posts: 39
Visionary
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Visionary
Joined: Apr 2007
Posts: 39 |
I have a unit here showing E21. There is an IC with a hole blown in the top of it in the heater wire detection circuit. I cannot find any info at all on the IC in question, so a new board stack is required to cure it.
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Joined: May 2003
Posts: 75
Adept
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Adept
Joined: May 2003
Posts: 75 |
the components on the mr850 cct boards cannot be replaced because the boards are set up at the factory( this is what f & p told me) therefore it looks like you'll have to replace the board.
richard
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Joined: Jul 2002
Posts: 2,020
Hero
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Hero
Joined: Jul 2002
Posts: 2,020 |
Well they would say that wouldn't they.
It is a very long time since I saw a circuit design with a resistor value labelled SOT* on the circuit diagramme.
RoJo
*SOT - Select on Test
My spelling is not bad. I am typing this on a Medigenic keyboard and I blame that for all my typos.
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Joined: Apr 2007
Posts: 39
Visionary
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Visionary
Joined: Apr 2007
Posts: 39 |
Just had another unit in here with E21. Replaced the IC in the heater wire detection/monitor circuit from the earlier mentioned unit (now scrapped) & all is good. The IC type will be either 90H948 or 90F009.
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Joined: Nov 2005
Posts: 160 Likes: 4
Mentor
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Mentor
Joined: Nov 2005
Posts: 160 Likes: 4 |
We have seen quite a few 850's with this fault, usually around 5-6 years old. We have tried to find the components and failed so we just buy the boards from F&P as well.
Mark
Mark Radbourne
I work for Löwenstein Medical in the UK
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