Another thought, maybe the CPU has a watchdog timer clocking from the
50Hz main supply, expecting some event after a certain interval, the CPU
is being forced to reset and not running the full program?

James Sweet wrote:

Sam Goldwasser wrote:

**THE-RFI-EMI-GUY** writes:


What ever happened to the thread about the 50Hz washer/dryer timer
motor. Is it fixed, is the mystery solved? I hope I didn't filter the
thread out while blocking all the Kook posts?



No, the mystery remains and probably will remain unless someone who
knows the design in detail can provide more info.

For reference:

http://repairfaq.cis.upenn.edu/Misc/tmp/pwrcard.jpg (photo of PCB)
http://repairfaq.cis.upenn.edu/Misc/tmp/sch_eng.pdf (wiring diagram)

I currently have the timer mechanism and electronics PCB in my
possession.

Power to the timer motor is indeed switched by a triac, whose gate
goes via a
buffer transistor to a pin on the microcontroller.

The power for the electronics seems to be derived from a rectifier, high
power dropping resistors (it runs on 230 VAC after all), and zener
diodes,
with no power transformer or line isolation.

The relay in the lower left corner of the photo has something to do with
either switching power to the main motor or its direction.

The next test might be to run the electronics and timer on 50 Hz and see
if it behaves any differently but I can't do that without the rest of
the
machine and I'm not sure that's really a viable option for the owner.



Have you tried applying power to the board with the timer motor
connected to see if the timer runs? In browsing through the schematic
it seems you might be able to fool the board enough into thinking the
rest of the washer is there with just a few switches and jumper wires.
Make it think the door is locked, water in the basket and the cycle
started and it might do enough to at least run the timer.


--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money" ;-P