Fault Isolation Tests; Preparation - Thermal Arc ARCMASTER 300S Service Manual

b) Verify the connection between High Frequency
Unit (HF UNIT1) and the current limiting resistor
(R2).
Verify the connection between HF UNIT1 and
the current limiting resistor (R2). Confirm that
the quick-disconnect terminals are inserted
onto the terminals of HF UNIT1 (TB3-TB4)
correctly and completely.
Confirm there are no short circuits, burnt or
broken wires between the HF UNIT1 and the
current limiting resistor (R2).
c) Verify the connection between the terminals
between AC1-AC2 (TB1-TB2).
Verify the connection between AC1-AC2.
Confirm that the quick-disconnect terminals
are inserted onto the terminals of HF UNIT1
correctly and completely.
Confirm there are no short circuits, burnt or
broken wires between AC1 and AC2.
d) Verify and replace the Gap (GAP) of the High
Frequency (HF UNIT1).
Confirm that the GAP is connected to HF
UNIT1 correctly and completely.
Confirm there is no dust or foreign debris
between the space of the GAP.
If there are any abnormalities observed with
the GAP, replace the GAP.
A setup of a gap is 1.0mm.
In the case of a gap 1.0mm or more, high fre-
quency voltage and period increases.
In the case of a gap 1.0mm or less, high fre-
quency voltage and period decreases.
e) Verify and replace the Current Limiting Resistor
(R6) on HF UNIT1.
If R6 is defective (blown, burnt, cracked,
etc.), replace R6.
Refer to section 12.3.15.
f) Replace the High Frequency (HF UNIT1).
Refer to section 12.3.26.
g) Replace PCB3 (WK-5548).
Refer to section 12.3.3.
300/ 400TS and 300/ 400S
4
Faul t I sol at i on Test s
4. 1 Pr epar at i on
The following initial conditions must be met
prior to starting any of the procedures in this
section.
1) Connect the appropriate input voltage.
(Check the name plate on the rear of the
power supply for the proper input voltage.)
N O TE
O per at e at al l i nput vol t ages as not ed on t he nam e-
pl at e on t he r ear panel w hen t est i ng t he pow er sup-
pl y.
2) Remove the side covers. Refer to section
tion 11.1.1.
3) Close primary power source wall discon-
nect switch or circuit breaker.
4) Place
SWITCH (S1) on rear of the unit in the "ON"
position.
W A R N I N G
D anger ous vol t age and pow er l evel s ar e pr esent
i nsi de t hi s uni t . Be sur e t he oper at or i s equi pped
w i t h pr oper gl oves, cl ot hi ng and eye and ear pr o-
t ect i on. M ake sur e no par t of t he oper at or ' s body
com es i nt o cont act w i t h t he w or k pi ece or any i nt er -
nal com ponent s w hi l e t he uni t i s act i vat ed.
11 – 10
11
A D VA N C ED TR O U B LESH O O TI N G
power supply MAIN CIRCUIT