Service manual

122 5
Power Supply Troubleshooting
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Figure 5-3 A1 +5 VD LED Location
Measure the A1 +5 VD Voltage
Measure the DC voltage on a test point A1TP4 (+5 V) using a voltmeter. Check that the
voltmeter reading is within 4.6 V to 5.4 V.
• If the voltmeter reading is not within these limits, continue with the FIND OUT WHY
THE A1 LED IS NOT ON STEADILY section.
• If the voltmeter reading is within these limits, the +5 VD power supply is verified.
5. Check the A9 Two LEDs
1. Remove the analyzer's bottom cover.
2. Turn the analyzer power on.
3. Look at the Two LEDs. The LED’s location on A9 Floating Power Supply is shown in
Figure 5-4. The LEDs are normally on.
• If the A9 Two LEDs are on, the A9 is verified.
• If one or two LEDs are off, continue with the next step, Disconnect Wire from A3
P11.