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TROUBLESHOOTING AND REPAIR | ||||
PC BOARD TROUBLESHOOTING GUIDE (continued) |
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| FIGURE F.1 – FIRING BOARD LEDs |
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| J5 |
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| LED8 | LED9 LED7 | (205) 8 | 16 (204) |
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| (206) 7 | 15 (203) |
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| (207) 6 | 14 |
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| (208) 5 | 13 (231) |
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| 4 | 12 (215) |
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| 3 | 11 |
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| 2 | 10 |
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| 1 | |
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| 9 | |
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LED5 | LED3 | LED1 |
| J6 |
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LED10
J7 |
LED6 LED4 LED2
J8
J4 |
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| FIRING BOARD | |
FIRING BOARD |
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1. With |
| 4. LEDs 1 thru 6 indicate that gate signals are being | |||
LEDs on the Firing Board should be lit. |
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| sent to the SCRs in the Main Rectifier. These | ||||
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2. LEDs 7, 8 & 9 indicate that the three 34vac sup- |
| LEDs will vary in brightness as the Output Control | |||
plies from the Main Transformer are present on the |
| is changed. | |||
Firing Board. They should all be ON whenever the |
| • It is important that all six LEDs are the same bril- | |||
Power Switch is ON. |
| liance as each other. | |||
• If any are not ON check the voltages at P5 |
| If none are lit, check the voltage at lead 231 | |||
| (P5 - Pin13). See the Control Board Test. If | ||||
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LED that | Check AC voltage between pins specified, |
| OK, Replace the Firing Board. | ||
was off | it should be approximately 34VAC . |
| If LEDs are not the same brilliance, see the | ||
7 | P5 pins 15 & 16 (wires 203,204) |
| SCR Bridge Test and check the connections | ||
8 | P5 pins 7 & 8 (wires 205,206) |
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| to |
9P5 pins 5 & 6 (wires 207,208)
•If voltage is present and the LED is OFF, replace the Firing Board
3.LED 10 indicates that the machine is “triggered” (Output Terminal Switch ON).
•Alternate Trigger Methods:
Operate Wire Feeder trigger.
Place a jumper across 2 & 4 on T.S.2.
Jumper between pins C & D of 14 pin connector.
•If LED 10 does not come ON, check wiring. Perform the Internal Trigger Circuit Test.