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11
Baker Instrument Company
The Measure of Quality
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DISPLAY NOT PRESENT
1.
Check DC voltage at J1 pin 1 on the Stack board. Voltage output will depend on
where the output control is set. A normal range will be from zero (0) volts at
minimum output setting to approximately 3 volts DC at 6 kV output. If not present
check all SCR’s Q1 through Q10 for shorts by measuring the resistance across all
cathode to anode junctions of each SCR. Replace those SCR’s found to be shorted.
Readings should be 700K ohms or higher. Bad junctions will read much lower.
2.
Check for same rise in DC voltage at U12 pin 3 on the I/O board, if not present, check
connection between these two points.
3.
Check at U12 pin 6 on the I/O board for the same increase in voltage, if not present,
replace U12.
4.
Check U3 pin 6 on the I/O board for the same increase, if not present, replace U3.