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TROUBLESHOOTING & REPAIR | |||
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INPUT BOARD VOLTAGE TEST (CONTINUED)
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10.After the relays activate check for 115VAC from both test points AC to CP. See Figure F.7. If this voltage is not present or low, the relay contacts may be defective.
11.Check the fan voltage at the fan terminals (V1 & V2). See Figure F.7 Normal is 230VAC. If this voltage is normal (230VAC) the primary circuit of the auxiliary transformer is operating correctly.
12.Check for the presence of approximately 15VAC at pins 1 and 2 of plug CN1. See Figure F.7.
13.With the torch consumables in place (nozzle, electrode and shield) check for the presence of approximately 6VDC at pins
Note: With the torch consumables removed this voltage should be approximately 26VDC.
14.If the relays (RL2 and RL3) are activating with 115VAC applied to the machine and the above test voltages are correct the input board is functioning correctly.
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Figure F.7 Input Board Test Points
F1
| AC |
| A B |
| RL3 |
| AC |
Fan | RL2 |
CP | |
Leads |
|
| V1 |
V2 | 1 2 3 4 5 6 7 8 |
PLUG CN1
