Verification Of The Power Supply Voltage - Thermal Arc ARCMASTER 200 TS Service Manual

11
200TS ADVANCED TROUBLESHOOTING
points U2 and V2 on the input switch, S1.
The location of points U2 and V2 on switch
S1 are indicated in Figure 11-7.
4) If this voltage is out of the operating range,
which is ±10% (207~253VAC) of the rated volt-
age (230V), replace S1 following the process
in section 12.3-4.
5) Verify the rectified output voltage of the primary
diode, D1 using a DC voltmeter. (The capabil-
ity of the voltmeter should be more than
400VDC.) Using a DC voltmeter, measure
between the points "+" [+] and "-" [-] on D1.
Points "+" and "-" are on PCB1 (WK-5713). See
Figure 11-8. The measured voltage should be
approximately 1.4 times larger than input volt-
age measured in #1 above. Replace diode D1
if the calculated measurement is not within the
corresponding range (285~360VDC) following
the process in section 12.3-4.
PCB1(WK-5713)
Figure 11-8: The check points "+" and "-"
6) Verify bus voltage (the voltage of the electro-
lytic capacitor after rectification) using a DC
voltmeter. (The capability of the voltmeter
should be more than 500VDC.) Using a DC
voltmeter, measure
TB1(P)[+] and TB3(N)[-] on PCB1 (WK-5713).
Points TB1(P) and TB2(N) can be found on the
parts side of PCB2. See Figure 11-9. The mea-
sured voltage should be approximately 1.4
times larger than input voltage measured in #1
above. Replace diode D1 if the calculated
measurement is not within the corresponding
range (285 ~ 360VDC) following the process in
section 12.3-1.
+
between the points
11 – 9
TB1
TB3
Figure 11-9: The check points TB1(P) and TB3(N)
7) After the replacement of D1, if the above voltage
is still abnormal, replace PCB1 (WK-5713).
5.2 Verification of the Power Sup-
ply Voltage
CAUTION
Before performing any portion of the procedure
below, make certain the unit is placed in the initial
set up condition as described in section 11.4.1
"Preparation".
1) Verify Power Supply voltage using an DC volt-
meter. (The capability of the voltmeter should
be more than 50VDC.) Operate at all input volt-
ages as noted on the nameplate on the rear
panel when testing the power supply.
2) On the PCB5 (WK-5448) and PCB4 (WK-
5449), measure the voltages according to the
following table. The check points and the refer-
ence are obtainable on the solder side of
PCB4 (WK-5449). The locations of points are
indicated in Figure 11-10.
Figure 11-10: Checkpoints TP0-TP3 on PCB6
PCB4 (WK-5449)
TP3
TP2
TP1
TP0