MK Products Cobramatic 120VAC - Manual (Page 16)

Cobramatic ® Owner’s Manual - page 9
Testing the Torch
Motor Check
Remove the amphenol connector from the cabinet.
Using the torch amphenol, check the resistance across pins “A” and “B”
(motor leads). The resistance across the motor should be between 5-10
ohms.
If an open circuit or short exist, check the motor leads and motor indepen-
dently.
Testing the Potentiometer - “W” Clocked
Using the torch amphenol, check the resistance across pin “D” (wiper) and
pin “C”. The resistance should vary from 0 - 5K ohms.
Check the resistance across pin “D” (wiper) and pin “G”. The resistance
should vary from 5K - 0 ohms.
Testing the Micro Switch
Using the torch amphenol, check for continuity across pins “E” and “F”
when the trigger is pressed.
Remote Potentiometer
When connecting a remote (cabinet or otherwise) wire speed potentiometer,
the jumpers at JP4 must be moved from the upper position (1-3) to the lower
position (1-2). This will disable the potentiometer in the welding torch. The
remote potentiometer leads must then be connected at J14. The cabinet
potentiometer feature applies to installation of this board into Cobramatic
®
Model 150-003 only, while the remote potentiometer feature applies to
Cobramatic
® Models 150-003 & 150-005.