Thermal Arc ARCMASTER 200 TS, Service Manual

Page: 52 / 96

200TS
11
ADVANCED TROUBLESHOOTING
11 – 10
Table 11-1: Checkpoints TP0-TP3 on PCB6
Figure 11-11: Checkpoints CN2 on PCB1
Table 11-2: Checkpoints CN2 on PCB1
3) If any of these voltages are not present or are
below a 10% tolerance, replace PCB1 (WK-
5713).
Refer to the page 12-5.
5.3 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 11.4.1
"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 (Posi-
tive [+]) 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 measure-
ment while the connector plug and receptacle
are still connected.
Figure 11-12: Verification of the FAN1
2) Using the measurement taken above, follow
the chart below for possible failure modes.
Test Point
PCB6
Reference
PCB6
ACCEPTABLE
VALUE
TP1 TP0 +5VDC
TP2 TP0 +12VDC
TP3 TP0 –12VDC
Test Point
PCB1
Reference
PCB1
ACCEPTABLE
VALUE
PIN 1 on CN PIN 2 on CN2 +24VDC
2 1
CN2
PCB1(WK-5713)
FAN1
Status
Voltage
measurement.
(1PIN-2PIN of
CN2 on PCB1)
Remedy
Case 1 Rotating DC 18 ~ 25V
FAN1 drive circuit is
normal.
Case 2 Rotating Below DC 18V
ReplacePCB1.
Refer to the page
12-5.
2 1
CN2
PCB1(WK-5713)