Tweco Max 300 w-Merlin 3000 - Manual (Page 40)

SERVICE 34 Manual 0-2549
If no problems are evident proceed to Step 8.
8. Remove the quick disconnect assembly from the
torch leads and check for continuity between the
positive and negative torch quick disconnect fit-
tings.
If there is no continuity, the quick disconnect as-
sembly is okay. Proceed to Step 9.
If continuity is found, replace the torch quick dis-
connect assembly.
Pins Description
1, 6 PIP Jumper
9, 10, 11, 12 Torch Identification
13, 14 Shield
A Coolant Supply (-)
B Coolant Return (Left-Hand Thread
C Plasma (+) Gas (Left-Hand Thread
D Secondary Gas
A-00283
10 11 12 13 14
1 2 3 4 5
6 7 8 9
A
D
B
C
Figure 5-13 Torch Quick Disconnect Fitting - Front
End View
9. If the torch quick disconnect assembly is okay, check
torch leads by measuring the resistance between
the plasma (+) lead connector and the coolant sup-
ply (-) lead fitting.
If continuity is found, replace the torch leads.
If no continuity is found, the torch leads are okay
and the problem was in the way the components
were assembled. Proceed to Step 10.
10. Carefully reassemble the componentsand recheck
the completed assembly per Step 3 to confirm that
the components have been properly assembled.
This completes the checks for the proper operation of the
center insulator of the torch head and leads.