aoyue 937 Plus Instruction Manual page 9

After replacing the heating element
1. Measure the resistance value between 1 pins 4& lor 22
Pins 5& lor 2. If it not °°. The heating element and sensor
Are touchline, this will damage the P.W.B.
2. Measure the resistance value ' a ' , 'b' and V to confirm that the
Leads are not twisted and that the grounding spring is properly connected.
B. Broken Soldering iron Cord
There are two methods of testing the soldering iron cord.
1. Turn the unit ON and set the temperature control knob to 480°C
Then wiggle and kink the iron cord at various locations along its
Length, including in the strain relief area.. If the LED heater
Lamp flickers, then the cord needs to be replaced.
CAUTION: The LED heater lamp will flicker even with a normal
Iron cord if the temperature reaches 480 °C
2. Check the resistance between the pin of the plug and the wire on
The terminal
Pin 1: Red Pin2:Blue 3:GreenPin 4.WhilePin 5:Black
The value should be 2 Ω If it is greater than 0 Ω c o
o r
[
s s
The cord should be replaced
C. Replacing the Fuse
Refer to the drawing in the replacement parts section of this
Manual. Decoder the blown fuse and remove it. Solder on a new one.