ISE 1606W – no motor rotation

[halftone]

Hi,

Sadly the drum doesn’t move. Belt fine, motor resistances all good, rotates freely.

Any attempt to run a programme ends with a blank timer display when the machine realises the drum isn’t moving. Pumps and taps operate OK.

I had this problem a few years back and it was just the IDC connectors on the MCU-motor cable playing up. I soldered them back then and all has been fine since.

It isn’t that this time, the cable is fine. There appears to be 0v to the stators or rotor from the MCU even when the motor should work. I’ve removed the board, but can see no obvious problem, no dry solder joints, burned components etc. The MCU transformer seems fine, ~38v output. Resistors on the board measure OK too.

I wonder whether maybe semiconductors on the board have been damaged by the lightning we had on Friday evening. I’ve had 2 modems destroyed like that, by an earth surge, in the past.

I know ISE are defunct, but is anyone able to test and repair or replace these boards? Refs on the board are 3730BB 39/09 INVENSYS 8082258 SW:JAZ4AA01A. Machine is a 1606W, 808054-01 WM25CM (on the circuit diagram). S/no: 094310863041

I see you have stock https://shop.ukwhitegoods.co.uk/8082258 … verter-pcb but I’m unsure whether my diagnosis is correct and it could be a very expensive mistake.

Is there anywhere else I should look for an explanation please?

I know the answer is: talk to an expert engineer, but I tried that 3 years ago and the local ISE engineer we’d used before couldn’t help, because the company had gone bust. Fortunately I was able to find the fault (IDC connectors) and DIY.

[halftone]

Re: ISE 1606W – no motor rotation

OK let me ask another question: is there any way I can test what I assume are the control signals for the MCU, from the front controller. I assume they’re the 4 skinny black wires. What should I see on them when doing (say) spin cycle? DC, or what?

I don’t mind buying a new MCU, but that’s obviously pointless if it’s the front panel not producing any output to control the motor. Someone must know, please!

[boohoo]

Re: ISE 1606W – no motor rotation

As of two days ago, I have exactly the same problem with exactly the same model.

Does anyone have any bright ideas?

Set a programme going, it drains, waits a few seconds, then drains again and finishes. No error messages, test programme does exactly the same thing.

I’ve tried reseating connectors as you did but it hasn’t worked.

I’m loathe to spend money on an engineer, what with the spare parts situation.

Looks like I’ll be buying a replacement in the next couple of days unless someone knows what’s up with it?

In which case, I guess Miele or Siemens/Bosch with a 5 or 10 yr warranty. Expensive business. 😕

[boohoo]

Re: ISE 1606W – no motor rotation

I meant to say, it went a couple of days ago. After a lot of fiddling around and trying various things, I got it to do a wash. Hurrah!

But since then it’s refused again.

[halftone]

Re: ISE 1606W – no motor rotation

When I had the motor issue the first time, it was due to poor connections between the MCU board and the motor. I found that if I moved the cable, the motor would work. The vibration of use had made the IDC connections poor. I pulled the plugs apart and soldered the wires to the plug pins, and it’s been fine ever since. If yours is intermittent, I suspect it’s the same problem, and easily fixed. Just try wiggling the wires a bit during a spin programme, see if the motor runs

I have a different problem now. Continuity on the cable is still fine, but there is 0v to the motor from the MCU board when the motor should be running. What I need to know is how to distinguish between failure of the MCU board, and failure of the main front control board that feeds it.

[halftone]

Re: ISE 1606W – no motor rotation

Well I may have got somewhere. The last time the engineer was here, the front panel was removed, and today I found a brown wire had been trapped and pushed through the chassis by one of the plastic fingers that keeps the front panel in place.

That wire turns out to be the neutral connector to connector 7, and over time the insulation had cut through and earthed the wire to the chassis. Connector 7 appears to be the 4 signal wires to the MCU that control drum operations.

I can see no damage to either the main control board on the front panel, nor the MCU, but even though I’ve checked continuity of the chafed brown wire, and it’s no longer earthed, I still have no motor operation. So presumably something is damaged by connecting the neutral to earth. I can imagine most semiconductors wouldn’t like that. Unfortunately I have no idea whether the problem is with the front controller, or the MCU.

Looks like it’s not repairable, given the absence of engineers, information and parts. A shame because the basic machine still has decades of life in it.

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