2.11 E94 "Thermistor Malfunction; 2.12 E99 "Initial Power Receiving; Verification And Remedy To Failures Without Indication Codes; Cooling Fan (Fan1) Failure" (Fan Is Not Rotating.) - Thermal Arc ARCMASTER 300 AC/DC Service Manual

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300ACDC ADVANCED TROUBLESHOOTING

2.11 E94 "Thermistor malfunction"

Cause
Thermistors for detecting temperature of internal
components have malfunctioned.
Verification/Remedy
a) Confirm a secure connection of the harness
wired between CN8-9 on PCB6 (WK-5549)
and Thermistors (TH1, TH2).
 Re-install the harness with a secure connec-
tion.
 Contact the manufacturer if you find any bro-
ken connectors or a damaged wiring harness.
b) Replace thermistors (TH1, TH2).
 Refer to section 12.3.22, 12.3.23.
c) Replace PCB6 (WK-5549).
 Refer to section 12.3.6.

2.12 E99 "Initial Power Receiving"

Cause
Occurs when the initial AC power received signal
has not reached the CPU. This error occurs nor-
mally during the power "OFF" sequence of the
unit.
Verification/Remedy
a) Confirm a secure connection of the harness
wired between CN1 on PCB21 (WK-4917) and
CN2 on PCB3 (WK-5548).
 Re-install the harness with a secure connec-
tion.
 Contact the manufacturer if you find any bro-
ken connectors or a damaged wiring harness.
b) Verify PCB4 (WK-4819) and replace it if neces-
sary.
 Confirm a secure connection of all the har-
ness wired to PCB3 and PCB4.
 Replace PCB4. Refer to section 12.3.4.
c) Replace PCB6 (WK-5549).
 Refer to section 12.3.6.
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.
environments 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 the page 12.3.24.
b) Verify the wiring harness between the cooling
fan (FAN1) and CN11 on PCB3 (WK-5548).
 Confirm a secure connection of the harness
to CN11 on PCB3.
c) Verify the drive circuitry of the cooling fan
(FAN1) on PCB3.
 Verify the drive circuitry of the cooling fan
(FAN1) on PCB3.
 Refer to section 12.5.3.
 Replace PCB3 if necessary.
 Refer to section 12.3.3.
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