MK Products Prince SG - Manual (Page 17)

Prince ® SG Spool Gun Owner's Manual - Page 9
Section E Troubleshooting
The 24 VDC gun motor is controlled by a solid state speed control and a
pot located in the gun. The gun motor, potentiometer, and micro switch are
connected to the cabinet/control box via a control cable and an amphenol
connector. If this cable becomes damaged, a variety of symptoms can occur,
depending on which wire(s) break. To test, check each wire for continuity
and shorts.
Testing The Gun
Motor Check
Remove the gun connector from the cabinet.
Using the gun 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
independently.
Testing the Potentiometer
Using the gun 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 gun Amphenol, check for continuity across pins “E” and “F” when
the trigger is pressed.
A
F
G
E
D
C
B
"W" Clocked
Amphenol Connector
Viewed from front of connector