2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
85
3.1.1.1.3 Hot-Wire Monitor Test (Current On)
1 Place a 10 k resistor between the pins listed below before each of the
voltage measurements in steps 3 through 6.
2 Use the SCPI command syst:print? to read the HW-Ionizer voltage.
(Terminal-to-instrument via RS-232C data communication required.)
3 Measure pins 1 and 37: reading should be between 20.0 and 21.0V
4 Measure pins 1 and 38: reading should be between -20.0 and -21.0V
5 Measure pins 3 and 37: reading should be between -20.0 and -21.0V
6 Measure pins 3 and 38: reading should be between 20.0 and 21.0V
QUESTION: Are all the readings within specified limits?
If Yes: Remove power, replace A2, and retest.
If No: Remove power, replace A7, and retest.
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