Thermal Dynamics PAK Master 150XL, Руководство по обслуживанию

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Manual 0-2728 4-15 SERVICE TROUBLESHOOTING
H. Temperature Circuit Test
The Power Supply has seven temperature sensing
switches.
• One on each FET Heatsink Assembly (four total)
• One located behind the Input Board near the Input
Bridge Diode.
• One on the Pilot/Output Heatsink
• One on the Radiator
If any one of these sense overtemperature, the Overtemp
Indicator on the Access Panel will light and not allow
DC output.
NOTE
Refer to the Appendix Pages for PC Board Lay-
outs.
Test the temperature circuit per the following:
1. Place the front panel ON/OFF switch to the OFF po-
sition.
2. Disconnect ribbon cable from the FET/Heatsink As-
sembly at J6.
A-01410
J6
FET/Heatsink and
Capacitor PC Board
Assembly
3. Place the front panel ON/OFF switch to ON.
4. Check the status of the TEMP indicator.
a. If indicator has gone OFF, then remove power and
replace the upper or lower pair of FET/Heatsink
Assemblies.
b. If the indicator is still on, go to the next step.
5. Place the front panel ON/OFF switch to the OFF po-
sition.
6. Disconnect ribbon cable from the next FET/Heatsink
Assembly at J6.
7. Place the front panel ON/OFF switch to ON.
8. Check status of the TEMP Indicator. If Indicator is
OFF, remove power and replace the upper or lower
pair of FET/Heatsink Assemblies.
9. Repeat steps 1-8 for each FET Assembly.
If the TEMP Indicator is still on, go to the next step.
10. Check the Temperature Switch at the Input Bridge
Diode, by completing the following:
• Make sure power is off at the wall disconnect.
• Remove one connection from the Temp switch lo-
cated behind the Input PC Board.
• Turn the unit back on.
If the Temp Indicator is off, remove power and re-
place Temp Switch.
If the Temp Indicator is still on, go to the next step.
11. Check the Pilot/Output Board.
• Remove power then disconnect J13 on Pilot Out-
put Board
• Turn power back on and check the TEMP Indica-
tor.
If the Indicator has gone off, replace Pilot Output PC
Board.
If the TEMP Indicator is still on, continue with the
next step.
12. Unplug J2 on the Logic Board.
13. Place the ON/OFF switch in the ON position.
If the TEMP indicator is off replace the Temperature
Switch on the Radiator.
If the TEMP indicator is still on replace the Logic
Board.
I. Gas Solenoid Circuit Test
NOTE
Refer to the Appendix Pages for PC Board Lay-
outs.
Make the following voltage checks per the circuit dia-
gram and replace the faulty part as required.
1. Place the RUN/SET Switch in the SET position and
check for 115 VAC from wire #56 to wire #52 at the
plasma gas Solenoid.
If approximately 115 VAC replace Solenoid.
If no voltage is present proceed to Step 2.