Thermal Arc ARCMASTER 200 S Service Manual page 49

11
200S ADVANCED TROUBLESHOOTING
below, make certain the unit is placed in the initial
set up condition as described in section 11.4.1
"Preparation" on page 11-6.
1) Verify the condition of the cooling fan, FAN1,
using a DC voltmeter. (The capability of the
voltmeter should be more than 50VDC.) Using
a DC voltmeter, measure between 1PIN (Posi-
tive [+]) and 2PIN (Negative [-]) of CN11 on
PCB3 (WK-5548). The location of connector
CN11 of PCB3 is indicated in Figure 11-12.
When you measure the above voltage, do not
remove the connector. Conduct the measure-
ment while the connector plug and receptacle
are still connected.
CN2
Figure 11-12: Verification of the FAN1
2) Using the measurement taken above, follow
the chart below for possible failure modes.
FAN1 measurement.
Status (1PIN-2PIN of
CN2 on PCB1)
Case 1 Rotating
Case 2 Rotating Below DC 18V
Case 3 Inactive Below DC 18V
PCB1(WK-5713)
2
Voltage
Remedy
FAN1 drive circuit is
DC 18 ~ 25V
normal.
Replace
PCB1.Refer to the
page 12-5.
Replace
PCB1.Refer to the
page 12-5.
4
Perform "2. Power
Supply Voltage
Test".
Refer to the page
11-9.
FAN1
Status
Case 4 Inactive
Table 11-3: Verification of the FAN1
 At the time of a low output and standby, as for
this equipment, rotation of a fan becomes slow.
Therefore, exact voltage measuring becomes
impossible. Perform the check of voltage in the
state of abnormalities.
 When verifying the voltage, Verify that the AC
input voltage remain within the operating range
of the unit. (The AC input does not drop below
180VAC).
1
11 – 9
Voltage
measurement.
Remedy
(1PIN-2PIN of
CN2 on PCB1)
Replace the
DC 18 ~ 25V FAN1.Refer to the
page 12-18.