Maintenance
8–22
1710J-Series Waveform Monitors
Low Voltage Power Supply
Faults in the low voltage supply can only be isolated using the following
procedure.
This procedure is used to eliminate some of the more obvious faults.
1. A properly functioning and loaded low volts supply will output the voltages
listed in Table 8–5. Use the DMM to measure the voltages between TP1 and
the voltage test points. If the supply is not regulating properly, continue with
the procedure.
Table 8–5: Low Volts Supply Voltages
Test Point
Voltage Range
W1 (+5 V)
+4.88 to +5.12 V
W4 (+15 V)
+14.0 to +16.0 V
W3 (–15 V)
–14.0 to –16.0 V
W2 – (+40 V)
+39.0 to +41.0 V
NOTE
. The Low Volts power supply troubleshooting is performed without
applying AC power.
2. Disconnect AC power from the instrument. Disconnect the instrument from
the Power Supply by removing the jumper from J4.
3. Use the DMM to measure the voltage between TP2 and the tab (drain) of
Q9. Check that the voltage is near 0 V.
WARNING.
Do not proceed until the the drain of Q9 is near 0 V. Dangerous
voltage potentials are present in the circuit until the capacitors discharge.
This is a resistance check for the switcher FET and the rectifier diodes.
1. Use the DMM to measure the voltage between TP2 and the tab (drain) of
Q9. Be sure the voltage is near 0 V before proceeding.
2. Unsolder and lift one end of R102.
3. With the negative lead of the DMM connected to TP2 and the positive lead
connected to the tab of Q9, measure the circuit resistance. A resistance of
Preliminary Checks
Rectifier/Switcher Check
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