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Hotpoint 1850 date code 60 (Dec 1974)
I had the pleasure of repairing this today 34 years old and still going 🙂 Sadly I can remember my way around them 😉 Not an eeprom in sight, just that PMC thingy
Anyone match this then ? 😉Re: No Laptop Required
it’s been a long time since I have seen an 1850 but I thought the PMC died with the 1600. Probably my memory fading though.
Re: No Laptop Required
PMC was definitely fitted to all of the 1850 range. The very early 1850’s had a triple micro switch setup on the door mechanism. The idea was a novel way to stop the machine if the door was opened during the spin cycle. The three switches had to make or break in an exact sequence, if memory serves the switch furthest from the cabinet front had to be ‘ first to make, last to break’. What this did was to route the power that the motor as an alternator was generating back through the motor itself using the heating element as a whacking big resistor in the circuit.
It was one quick way to test if the heater was OC. Set the machine to spin, let it reach full speed (800 rpm) then turn quickly to off and open the door. If all was well you got a lovely ‘Screech’ as the dynamic braking kicked in as the current was fed back through the motor. The only problem was that the micro switches went out of sync so easily that the PMC ( power micro circuit ) used to go off with a loud bang on many occasions.
This system was soon done away with and the single micro switch and pecker mechanism door interlock came into being.
Jim.
Re: No Laptop Required
As a supplementary question, can anyone tell me what the ‘flying leads’ were and why they were introduced on late model 1850’s. 🙂
Jim.
Re: No Laptop Required
iadom wrote:As a supplementary question, can anyone tell me what the ‘flying leads’ were and why they were introduced on late model 1850’s. 🙂
Jim.Flying leads? where are they Jim
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Nowt to do with replacement motor?, DC motor had flying tacho leads AC one had em thru motor plug 😉
Re: No Laptop Required
The AC Delco DC motor was only used on the 1600/1830 machines.
All the early 1850’s used the GEC produced DC motor. The original motor plug was a round plug with small round pins just like the earlier 1600 type. A huge amount of OOB calls due to poor motor plug contact resulted in the flying lead solution.
It was as you say two ‘extra’ leads from the tacho that supplemented the two in the motor wiring harness. These two wires plugged directly onto two small tags on top of the horizontally mounted PCB behind the facia.
Eventually they reverted to the large rectangular motor plug with full size AMP tags and the base mounted module and the AC motor.
Jim.
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