Thermal Arc 185 AC, Руководство по обслуживанию

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10-14
May 22, 2006
ARCMASTER 185 ACDC 200 ACDC
PCB3
CN18
Pin 1
Pin 3
Figure 10-9: Check Points for TP0-3, 6-11, 00
Check Point
PCB3
Reference
PCB3
ACCEPTABLE
VALUE
Pin 1 on CN18 Pin 3 on CN18 +24VDC
Table 10-2: Checkpoints CN18 on PCB3
3) If any of these voltages are not present or are
below a 10% tolerance, replace the PCB3 (WK-
5548). Refer to section 11.3.4.
1. Verification of the Cooling Fan, FAN1,
Drive Circuitry
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 10.05 "Preparation".
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 PIN 1 (Positive [+])
and PIN 2 (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 measurement while the connector
plug and receptacle are still connected.
PCB3
CN11
1pin
2pin
Figure 11-12: Verification of the FAN1
FAN1
Status
Voltage
measurement.
(PIN1-PIN2 of
CN11 on
PCB3)
Remedy
Case
1
Rotating DC 18 ~ 25V
FAN1 drive circuit is
normal.
Case
2
Rotating Below DC 18V
Replace PCB3.
Refer to section 11.3.4.
Case
3
Inactive Below DC 18V
Replace PCB3.
Refer to section 11.3.4.
Perform “2. Verfication of
Power Supply Voltage”.
Refer to section 10.07.
Case
4
Inactive DC 18 ~ 25V
Replace the FAN1.
Refer to section 11.3.24.
Table 10-3: Verification of the FAN1
• During low output and standby, the fan
rotation slows down, making exact voltage
measurement impossible.
• When verifying the voltage, confirm that the AC
input voltage remains within the operating range
of the unit. (The AC input does not drop below
180VAC).