Bosch WFB2005GB/16 Fd 7703

[rocker]

Need to replace the door interlock…as the original lock is a different design..and there appears no numbers on the cable spades..the new one lock is labelled 1..2..3.. need info to convert please..John

[electrofix]

first are all 3 cables the same size or is one smaller ?

Dave

[rocker]

didn’t notice to be honest..not at job now…

[rocker]

I believe there were the same size

[electrofix]

prob is its an old machine and access to bosch tech is limited

do you have the new lock there
if yes get your multimeter and see if you have a reading between terminals 1 and 2. This hopefully is the ntc heater

then hopefully we can work it out from there

Dave

[rocker]

Hi Dave.. yes have reading between 1&3 ..(2 being switch line.). so of course I can test 240v being the power course..only problem is the polarity correct and of course is neg or positive switched..!!!!

[electrofix]

right we need to find out which the main contacts are

power it up and lock it

then disonnect and do this quickly as we dont want it to unlock

you need to see if you get 0 ohms between 1 and 2 or 3 and 2

trying to find out which one is the main terminal into the lock

Dave

[rocker]

ok will do the test and let you know in a while ..cheers

[rocker]

zero ohms between 3&2

[rocker]

Just to let you know I wired No 1 positive 3 negative

[electrofix]

right see if you agree
from the measuremants what we have is

[rocker]

I agree. Dave

[electrofix]

the rest has to be done on the machine

you have 3 wires going to the interlock

a) a live or N permanant feed from the switch if it has one

b) a switch wire that connects to (a) when the lock is activated

c) A trigger wire from the timer

we have to detemine which is which

1 use your multimeter on the buzz setting. one of these wire will give a short circuit from the plug when the machine is on. which ever this wire is it has to go on 3. The logic of this is if it was connected to 2 the lock heater would not have a feed as its on the other side of the sw. If it was connected to 1 then the power for the machine would be coming through the board triac

2 next you need to find the switch wire. you can use your multimeter or connect a low current component like a lamp or pump. connect the wire you have just identified and choose one of the others. with the machine turned on you need to find the wire that give you 230v when you push start and give you 0v when you pause it. wichever wire this is must be 1

can you see where i am coming from

Dave

[rocker]

Cheers Dave, many thanks for your help..John

[Author]

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