**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.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

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