Thermal Dynamics CUTMASTER SL100SV, Operating Manual

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Manual 0-4640 5-21 SERVICE
5
C. Torch will not pilot; AC , GAS , and TEMP indicators ON, DC indicator OFF
1. Air flow blocked
a. Check for blocked air flow around the unit and correct condition.
2. Unit is overheated
a. Let unit cool down for at least 5 minutes. Make sure the unit has not been operated beyond Duty Cycle limit. Refer
to duty cycle data in Specifications Section.
3. Input line voltage is low
a. Check and connect to proper input power line.
4. Faulty Temperature Sensor / Switch
CAUTION
Turn off input power for the following tests.
a. Check IGBT Heatsink Temp Sensor (TS1). Disconnect wire connector P2 from terminal J2 on Main PC Board. Check
connector pins 1 and 2 for 10k ohm (± 25%) (at ambient temperature). If resistance is not 10K ohm (±25%), replace TS1.
b. Check Inductor Temp Switch (TS2). Disconnect wire connector P23 from terminal J23 on Main PC Board. Check
connector pins 1 and 2 for at least 12K ohms. If resistance is less than 12K ohms, replace output inductor (L1). If temp
switch is open, replace Main PC Board.
5. Faulty Logic PC Board
a. Check for (±) 12 vdc on Logic PC Board between J1-9 and TP1. If (±) 0 vdc is present, replace Logic PC Board.
6. Faulty Main PC Board
a. Check for (±) 0 vdc on Main PC Board between J41-9 and TP1. If (±) 0 vdc is present, replace Main PC Board.
7. Faulty Fan
a. Measure for (±) 230VAC on Main PC Board from J26-1 to J26-4.
• If voltage is correct, replace fan (M1).