Thread Number: 68524  /  Tag: Vintage Automatic Washers
Project: PCBs Schematics of Washing Machines Control Boards
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Post# 912705   12/27/2016 at 04:29 (481 days old) by E685X (Italy)        

Hi everybody!
Hope you are all having a nice holiday.
Let's get to the point: I am very passionate about electronics and I am willing to trace circuit diagrams of old washing machine control boards. I won't ask for money at all and once I'll have them finished I'll publish them on this thread, but before I can do that, I need you to do me a favour: you should take high quality pics (like the ones I have attached in this thread) of the PCB you want me to "reverse engineer". These photos should be of the front and back side of the circuit and any transistor/triacs/SCR name, as well as the capacitor values, should be photgraphed too. Also, unlike the two photos I have sent here, they should be taken after having removed the heatsinks that cover the important components I need to see.
Tha goal of this idea of mine is to help you preserve and easily service old boards to keep them running for a long time.
I'd say that if you have pictures of these two Hotpoint speed control modules that I have attached that satisfy the requirements it'd be a good start.
Not only it would be useful to you, it would also be useful to me (to gain some experience in drawing schematics and to finally be able to get a schematic of these Hotpoint boards I absolutely love).


  Photos...       <              >      Photo 1 of 3         View Full Size

Post# 913303 , Reply# 1   12/31/2016 at 12:11 (476 days old) by imperial70 (******)        

What about the traces inside the board. You have two be sure there are only to layers to a board for that to be efective. Very unusual in this day and age.

Post# 913328 , Reply# 2   12/31/2016 at 15:30 (476 days old) by Kb0nes (Burnsville, MN)        

kb0nes's profile picture
I think it would be exceedingly unusual for any appliance board to have more then 2 trace layers. The circuitry is too simple to need internal layers. Adding internal layers greatly bumps the board manufacturing costs

Post# 913359 , Reply# 3   12/31/2016 at 18:25 (476 days old) by potatochips (Nova Scotia)        

This is a brilliant idea. Thank you!

Post# 913428 , Reply# 4   1/1/2017 at 05:18 (476 days old) by mathewhebailey0 (port arthur tx)        
aplliance control board schematics

I just bought a Wacom Intuos Photo tablet at Best Buy this week sometime before New Years. I'm still trying to deal with tweaking & adjustments on it so I can also draw schematics for electronic & electrical purposes. However,I did draw on graph paper & in Gimp a drawing for a voltage/frequency converter (travel converters sometimes convert only voltage or frequency) to convert both frequency & voltage between 120 & 220 volts & between 50 & 60 hz using two 120/220 step up/down transformers & a frequency converter or as an alternative to the frequency converter,a variable frequency drive (AC motor controller) to adjust from 50 to 60 hz output & vice versa. I can also plug into the output outlet on such an ideal converter a 0 to 220 volt variac due to that some foreign stuff uses mains voltages varying from 100 to 220 volts. I could redesign the drawing for my volts/frequency converter to include the mentioned variac as an integral part to vary the output voltage from 100 to 220 volts if necessary.

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