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Check 10, DC-DC Converter Input Voltage
1. Turn on the 4338B.
2. Using a multimeter, check if the voltage between \DC OUT" test pad and TP500 (DC-DC
Converter input voltage) is between 12 V and 15 Vdc. Refer to Figure 4-13 for test pad and
pin locations.
3. If the voltage is in range, proceed to the \Check 11, DC-DC Converter Open Output
Voltages", otherwise proceed to the \Check 12, Transformer Secondary Voltage".
T roubleshooting
4-17
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