
Chapter 3---Service Adjustments
2. Measure the number of millivolts between pins 3 and 4 on SPS J505.
NOTE: This circuit is designed so that the number of millivolts between these pins (for Models 340 and 370, it is millivolts divided by 10) represents the lamp current in amps.
3.Multiply the two (2) figures from Item 1 and from Item 2 together.
4.Divide the product from Step 3 by 1 for Model 330 wattage. Divide the product from Step 3 by 10 to get wattage for Model 340SC or 370SC.
5.Adjust the Lamp Current Adjust pot (see CAUTION below Table
Example (for Model 370SC): Voltage measured between J503 and J504 = 28V and voltage measured between pins 3 and 4 of J505 = 1070mv.
The product of this is 29960÷10 = 2996W. This result is within the Model 370SC spec of 3000W ± 25W and would not require adjustment.
Table
Model 330
Model 340SC
Model 370SC
1500 Watts ± 25W | 2000 Watts ± 25W | 3000 Watts ± 25W |
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68 Amps Normal | 80 Amps Normal | 100 Amps Normal |
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70 Amps Maximum | 85 Amps Maximum | 110 Amps Maximum |
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CAUTION! Make adjustments in small increments to ensure lamp integrity (lamp overheating may occur if current is abruptly increased). Do not increase the current beyond the maximum levels listed in Table
Model 330, 340SC, 370SC Service Manual |