I think I figured out the problem. When I rebuilt the lamp assembly, the R901 air heater resistor was listed as a 750ohm 2W on the
schematic so that's what I installed. I just measured the old resistor, which had a broken lead, and it is 534ohms. I sort of
repaired the broken lead and installed it. Now the unit locks up real quick and the AD10 sensor is showing around 70C. The other
problems were a broken C904 and a bad U800 8V regulator.
Scott
On 11/16/18 8:48 PM, Mark Sims wrote:
The case temperature derived from the ADC reading does not match actual
measured values. The PRS10 data sheet says it is roughly the temperature
midway between the baseplate and lamp temps.
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