A: By doing that, your capacitors on the control board will take too long to discharge and it will take
about 20 seconds for your LCD to turn off. It might also cause some noise and spikes that will
effect the Newhaven LCD. There is a work around for this by connecting a snubber to the switch
but I suggest not to do it until it has been tested.
2: Q... I am populating the control pcb and can't find where c15 c16 & c17 go. What am I
missing?
A: C15, 16 an 17 gets connected, after you're done with your wiring to terminal P3, to the pins shown
on the Hardwire.pdf drawing. Look at the photo (the Photo only shows two of them)
3: **** I received reports of people buying 1/4 inch phone jacks for their foot switches from Radio Shack**************
THE PHONE CONNECTORS FROM RADIO SHACK ARE NOT INSULATED FROM GROUND.....DO NOT USE THEM, THEY WILL BLOW YOUR MICROPROCESSOR
4: Q... The manual says that D10 has a green band that should point up towards P4, mine has a
blue band.
A: The blue band should point up towards P4. Mine was discolored from the heat and looked green
5: Q...The bill of material has R27 in it, the manual says not to use R27, should I?
A: Do not install R27. With R27 installed your speaker will not work. DO NOT JUMPER R27
EITHER.
6: Q...Can I use a transformer with a different voltage than 24V ?
A: Yes, You can go as low as an 18VAC transformer( preferably a toroidal transformer). Make
sure that it is at least 12Amps. If the transformer has only one 18V secondary winding,
it should be 216VA . If it has two 18V windings it should be 432VA . You
might lose some charging speed with the lower voltage though.You can also use a 25V
transformer. CLICK ON THE AD TO YOUR RIGHT TO PURCHASE.
7: ****Because the LCD turns on and work does not mean that it is connected correctly. *****
A miss wired LCD can cause the processor to behave erratically and probably blow Q4
and Q5.
Double check each wire and connection points on the LCD. The photo below shows a
LCD from someone that was blowing Q4, Q5 and the diodes connected to them.
in and out. Look at the wire that should have been connected between 10 and 16. Its
connected between 11 and 16. It took 4 weeks and about 100 emails to find.
8: **** LCD FREEZES AFTER A COUPLE OF WELDS****
Connect a 200 Ohm resistor between pin 17 of P3 on the control board and Pin 1 of P2
of the mosfet board.
9: It seems like some manufacturers can not use the BoardedgeRoute.txt file for the board
outline on the Mosfet PCB. Download and use the file below for the Mosfet PCB's outline.
https://rapidshare.com/files/2532437616/MosfetwelderManufact1.GKO
10: MICROPROCESSOR VERSION 2.5 USERS ONLY
IF U5 TRIPS ON OVER VOLTAGE WHEN TRYING TO ADJUST YOUR WELDER TO
23.2V, ZENER DIODE D4 NEEDS TO BE CHANGED . THIS DIODE WILL CAUSE THE
LCD TO DISPLAY A MAXIMUM OF ROUGHLY 21.4V CAUSING U5 TO TRIP ON
OVER VOLTAGE. REPLACE D4 WITH THIS DIODE:
http://search.digikey.com/OVER VOLTAGE. REPLACE D4 WITH THIS DIODE:
11: What is the value of D9?
D9 has to be jumped with two thick wires. D9 was a place holder for a protection circuit at the
time of design. Page3 #8 in the control manual.
