Verification Of The Secondary Diode (D2, D3); Verification Of The Primary Igbt (Q1A-Q4C) - Thermal Arc ARCMASTER 200 TS Service Manual

2) Refer to Table 11-5 and Figure 11-14 for
the checkpoints on D1.
TERMINALS
COMPONENT
Positive
TESTED
lead
1, 2, 3
Diode of D1
5
1, 2, 3
Diode of D1
4
Table 11-5: Tester checkpoints for D1
1
2
3
Figure 11-14: Tester checkpoints in the D1 inter-
connection diagrams
5.6 Verification of the secondary
Diode (D2, D3)
CAUTION
Before performing any portion of the procedure
below, make certain the unit is placed in the initial
set up condition as described at the beginning of
an above section "1.Preparation". Refer to section
11.4-1.
1) Verify the characteristic of the secondary
diode, D2 and D3, using a diode tester.
2) Refer to Table 11-6 and Figure 11-15 for
the checkpoints on D2 and D3.
ACCEPTABLE
Negative
VALUE
lead
5 0.3 to 0.5V
1, 2, 3 Open
4 Open
1, 2, 3 0.3 to 0.5V
5 4 3 2 1
5
4
11 – 12
11
200TS ADVANCED TROUBLESHOOTING
TERMINALS
COMPONENT
Positive
TESTED
lead
Diode 1 of D2, Anode
and D3, Cathode
Diode 2 of D2, Anode
and D3, Cathode
Table 11-6: Tester checkpoints for D2 and D3
Cathode
Anode
Figure 11-15: Tester checkpoints for D2 and D3
5.7 Verification of the primary
IGBT (Q1A-Q4C)
CAUTION
Before performing any portion of the procedure
below, make certain the unit is placed in the initial
set up condition as described at the beginning of
an above section "1.Preparation". Refer to section
11.4-1.
1) Check whether there are any abnormalities on
the appearance of PCB6 and PCB7.
2) Verify the characteristic of the primary IGBT
(Q1A-Q4C), using a diode tester.
3) Refer to Table 11-7 and Figure 11-16 for
the checkpoints on PCB6 and PCB7.
ACCEPTABLE
Negative
VALUE
lead
Cathode 0.2 to 0.3V
Anode Open
Cathode 0.2 to 0.3V
Anode Open
Cathode
Anode