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TROUBLESHOOTING AND REPAIR |
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| FIRING BOARD TEST (continued) |
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| FIGURE F.6 FIRING BOARD |
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| (205) 8 | J5 |
| LED8 | LED9 LED7 | 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 |
FIRING BOARD |
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PROCEDURE
WARNING
ELECTRIC SHOCK can kill.
• Do not touch electrically hot parts.
7.Trigger the
NOTE: LEDs 1 thru 6 should alwaysl be the same bril- liance as each other. The brilliance will vary as the Output Control is changed.
8.If LED 10 does not come ON, perform the Internal
Trigger Test.
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| 9. If LEDs 7,8 &9 are ON and any of LEDs 1 thru 6 |
1. |
| Disconnect the AC input power to the | |||
| are not ON, turn the machine OFF , disconnect J4 | ||||
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| machine. | and re- energize the machine. All six LEDs should | ||
2. |
| Locate the firing board on the left side of the con- | be ON very bright. If not Replace the Firing Board. | ||
| If so perform the SCR Bridge Test. | ||||
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| trol box. | |||
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3. |
| Perform a visual inspection on the firing board to | 10. If LEDs 7,8 &9 are ON and any of LEDs 1 thru 6 | ||
| are not the same briliance as the others, Perform | ||||
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| see if there are any loose or faulty connections or | |||
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| the SCR Bribge Test. If OK, replace the Firing | |||
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| physical damage. | |||
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| Board. | |||
4. |
| Connect the correct AC input power to the | |||
| 11. If LEDs 1 thru 6 do not change as the output con- | ||||
5. |
| Turn the power switch (SW1) to the ON position. | |||
| trol is varied: | ||||
6. |
| LEDs 7, 8 and 9 should be lit and equally bright. | • Check the Output Control Potentiometer. | ||
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| See Figure F.4 to locate the LEDs. The three LEDs |
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should be of equal intensity. If not correvt, see the | • Make sure that the Local/Remote Switch is in | |
Local and functioning properly. | ||
PC Board Troubleshooting Guide. | ||
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| • Perform the Control Board Test. If OK, replace | |
| the Firing Board | |
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