Thermadyne Thermal Dynamics PAK MASTER 50XL, Руководство по обслуживанию

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Manual 0-2587 19 SERVICE TROUBLESHOOTING
4.07 Pilot Arc Problems
Locate your symptom below:
A. AC indicator ON; No gas flow; GAS and DC
indicators OFF (Torch Switch must be pressed)
1. RUN/SET switch in SET position
a. Place RUN/SET switch to RUN position
2. Faulty RUN/SET switch
a. Check switch and replace if necessary
3. Faulty hand torch parts or Logic PC Board
Check torch switch enable indicator, D5, on the
Logic PC Board.
a. If indicator D5 is ON, torch shield cup and
switch are okay.
b. If Torch Switch Enable indicator D5 on Logic
PC Board is OFF check the following:
Check Pilot/Output PC Board for 12 VDC between
J12 pin 1 to pin 3 with torch switch pressed.
• If voltage is correct, replace Torch parts as
needed per appropriate Torch Instruction
Manual
• If voltage is incorrect, replace Logic PC Board
5. Faulty Logic PC Board
Check CD enable indicator, D15, on the Logic PC
Board. If OFF, on Logic PC Board check for 12
VDC between J5 pins 8 to 9 with torch switch
pressed.
a. Replace Logic PC Board if less than 1 VDC is
present
B. AC indicator ON; Gas flows; GAS indicator ON;
DC indicator blinks; Small arc may be visible in
torch
1. Faulty Pilot Output PC Board or Shorted Torch
a. Test per Section 4.09-H; repair as necessary
2. Faulty FET/Heatsink Assembly
a. Check per Section 4.09-I; repair as necessary
3. Faulty torch
a. Check torch per appropriate Torch Instruction
Manual
C. AC indicator ON; Gas flows; GAS and DC
indicators ON; No arc in torch; No arc at spark
gap on CD PC Board; CD enable indicator (D15)
on CD PC Board ON
1. Faulty CD PC Board
Measure DC voltage between J11-4 to J11-5 on CD
PC Board
a. If voltage is less than 2 vdc replace CD PC Board
A-01188
CD PC Board
J11
Pin 4
Pin 5
D. AC indicator ON; Gas flows; GAS and DC
indicators ON; Spark at gap on CD PC Board and
CD enable indicator (D15) on Logic PC Board ON;
No arc or intermittent arc in torch
1. Gas pressure(s) set incorrectly (too high)
a. Refer to appropriate Torch Manual
2. Oil/moisture in air lines
a. Purge system. If problem corrected add filters
in line with air source
3. Incorrect torch parts
a. Refer to appropriate Torch Instruction Manual
4. Faulty leads
a. Check continuity per appropriate Torch Instruc-
tion Manual
5. Faulty torch
a. Check continuity per appropriate Torch Instruc-
tion Manual
6. Faulty connection of wire #16 or #17 to Pilot Output
PC Board
a. Check wiring connection