Verification And Remedy To Failures Without Indication Codes; Cooling Fan (Fan1) Failure" (Fan Is Not Rotating.); Gas Valve Failure" (No Gas Flow Through Unit) - Thermal Arc ARCMASTER 200 TS Service Manual

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200TS ADVANCED TROUBLESHOOTING
3
Verification and Remedy to
Failures without Indication
Codes
Refer to Note on Section 11.02.
3.1 "Cooling Fan (FAN1) Failure"
(Fan is not rotating.)
Cause
Occurs when the cooling fan (FAN1) is defective,
damaged or the driving voltage is incorrect.
Verification/Remedy
a) Verify the cooling fan, FAN1.
 Inspect the condition of the fan blades and all
peripheral parts. Clean the fan blades and all
peripheral parts if covered with dust. Clean-
ing and removing dust from the fan blades
once every 6 months in a normal environ-
ment is recommended. Extremely dusty envi-
ronments will require more frequent cleanings.
 Verify that there are no wiring harnesses
entangled inside the fan, confirm that the har-
nesses do not have any brakes in the wire or
damaged connectors.
 Replace wiring harnesses if you find any bro-
ken connectors or damaged wiring har-
nesses.
 Replace the fan if there are any broken,
cracked or missing fan blades. Refer to sec-
tion 12.3-11.
b) Verify the wiring harness between the cooling
fan (FAN1) and CN2 on PCB1 (WK-5713).
 Verify a secure connection of the harness to
CN2 on PCB1.
c) Verify the drive circuitry of the cooling fan
(FAN1) on PCB1.
 Verify the drive circuitry of the cooling fan
(FAN1) on PCB3.
 Refer to section 11.5-3.
 Replace PCB1 if necessary. Refer to section
12.3.1.
3.2 "Gas Valve Failure"
(No Gas flow through unit)
Cause
Occurs when the gas valve (SOL1) is defective,
damaged or the driving voltage is incorrect.
Verification/Remedy
a) Verify that TIG welding is selected on the weld-
ing mode.
 Do not change welding modes while weld-
ing. Only change welding modes when the
unit is idle (torch switch OFF).
 Verify the setting of Pre-flow and Post-flow on
the front panel. If the Pre-flow or Post-flow
time is set to 0 seconds, change them to
higher setting.
b) Verify the layout the of gas hose.
 Verify that the hose is securely connected
into the fitting at the inlet and the outlet. Verify
the layout of the gas hose so that it is not
bent or kinked. Verify there are no breaks,
burns or holes in the hose.
 Verify the layout of the TIG torch gas hose
and that the hose adapters are properly con-
nected.
c) Verify the wiring harness and connection of gas
valve (SOL1) and CN2 on PCB1 (WK-5713).
 Verify a secure connection of the harness to
CN2 on PCB1.
d) Verify the drive circuitry of the gas valve (SOL1).
 Verify the drive circuitry of the gas valve
(SOL1).
 Refer to section 11.5-4.
 Replace PCB1, when abnormal. Refer to
section 12.3-1.
e) Replace PCB4 (WK-5449) and PCB5 (WK-
5448).
 Refer to section 12.3-4, 3-5 for the replace-
ment of PCB4 and PCB5.
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