Amada 300 Series, Operation Manual

Page: 59 / 80

CHAPTER 4: SERVICE
SERIES 300 FAST RESPONSE WELD HEAD SYSTEM
990-115 4-7
Figure 1-1. Control Board Test and Adjustment Points
6 Locate the Control Board, which is on the right hand side of the Weld Head Control. All of the test
points and adjustment potentiometers are located on the Control Board. Refer to figure 1-1 on the last
page of this procedure to locate the test and adjustment points.
7 Set the Calibration pushbutton switch on the top edge of the Control Board to the Calibration (UP)
position.
8 Connect the voltmeter to test point TP1 and ground it at test point TPG. Adjust potentiometer R19 for
a reading of 0.00 VDC, ± 1mV, on the voltmeter.
9 Press right arrow key [ ► ]. The voltmeter should now read approximately 5 volts. Adjust
potentiometer R9 for a reading of 5.786 VDC, ± 3mV, on the voltmeter.
10 Press right arrow key [ ► ]. Adjust potentiometer R51 to set the indicator bar to center scale, or zero.
Notice there is a 4-digit number just to the right of the word “Calibrate.” For best accuracy, adjust
this reading to 0000, ± 2.
11 Press right arrow key [ ► ]. Move the voltmeter lead to test point TP2. Adjust potentiometer R11 for
a reading of 0.00 VDC, ± 1mV on the voltmeter.
12 Press right arrow key [ ► ]. Adjust potentiometer R3 for a reading of -2.014 VDC, ± 1mV, on the
voltmeter.
13 Remove the voltmeter from the circuit. Press right arrow key [ ► ]. Adjust potentiometer R71 to set
the indicator bar to center scale, and the 4-digit reading to 0000, ± 3.
14 Press right arrow key [ ► ]. Adjust potentiometer R105 to set the indicator bar to center scale, and the
4-digit reading to 0000, ± 3.
15 Press right arrow key [ ► ]. Adjust potentiometer R90 to set the indicator bar to center scale, and the
4-digit reading to 0000, ± 3.
16 Press right arrow key [ ► ]. Set the Calibration switch to the normal (DOWN) position. Adjust
potentiometer R108 to set the indicator bar to center scale, and the 4-digit reading to 0000, ± 3.