5-5 Troubleshooting Tables
Chapter 5 — Troubleshooting
5-16
PN: 10370-10372 Rev. B
MG3702xA MM
1.
Disconnect the MG3702xA from the power source, then check the line fuses on the rear panel.
•
If the line fuses are good, go to
.
•
If the line fuses are defective, replace the fuses.
2.
Apply power to the instrument.
•
If the instrument powers up, the problem is cleared.
•
If the instrument fails to power up, go to
3.
Disconnect the MG3702xA from the power source, then remove the MG3702xA top cover.
4.
Remove the four outer screws to the top cover of the power supply module and lift the cover with the main
power supply attached. Refer to the R&R procedures in
Chapter 6, “Removal and Replacement
as needed.
5.
Inspect the AC line supply/switch block and the wiring to the main power supply and standby power
supply for defects.
•
If a defect is found, replace as necessary.
•
If no defect is found, go to
6.
Replace the standby and main power supplies.
•
If the instrument powers up, the problem is cleared.
•
If the instrument fails to power up, contact your local Anritsu service center for assistance.
Checking DC Voltages
Manually check system DC voltages (see table 5-6) to ensure the supplies are close to the expected values.
1.
Remove the MG3702xA top and bottom cover.
2.
Apply power and measure the regulated voltages at A1P3 according to
•
If one or more, but not all of the related voltages are out of regulation, a malfunction of the
regulation circuitry is indicated. Replace the A2 voltage regulator PCB.
•
If all of the related voltages are out of regulation, a malfunction of the regulator supply source is
indicated. Replace the related supply source according to
3.
Check for normal operation.
•
If the instrument powers up, the problem is cleared.
Table 5-3.
Malfunctions Not Displaying an Error Message 1
MG3702xA Will Not Turn On (OPERATE light and FAN are OFF)
Normal Operation:
When the MG3702xA is connected to the power source and the rear panel line switch is
turned on, the OPERATE light should illuminate (green) and the instrument should power up. When the
MG33702xA is set to standby mode, the fans should run slow and the STANDBY light should illuminate (yellow).
Table 5-4.
Malfunctions Not Displaying an Error Message 2
MG3702xA Will Not Turn On (OPERATE light is ON)
Normal Operation:
When the MG3702xA is connected to the power source and the rear panel line switch is
turned on, the OPERATE light should illuminate and the instrument should power up. When the MG3702xA is set
to standby mode, the fans should run slow and the STANDBY light should illuminate.
Caution
For safety reasons, do not take voltage measurements inside the power supply enclosure. Instead,
take the measurements on P3 of the motherboard.
Summary of Contents for MG3702xA Series
Page 4: ......
Page 5: ......
Page 8: ...TG 8 PN 10370 10372 Rev B MG3702xA MM ...
Page 24: ...1 12 Test Equipment List Chapter 1 General Information 1 10 PN 10370 10372 Rev B MG3702xA MM ...
Page 42: ...2 5 RF Deck Assemblies Chapter 2 Functional Description 2 18 PN 10370 10372 Rev B MG3702xA MM ...
Page 120: ...5 5 Troubleshooting Tables Chapter 5 Troubleshooting 5 24 PN 10370 10372 Rev B MG3702xA MM ...
Page 182: ...Index 4 PN 10370 10372 Rev B MG3702xA MM ...
Page 183: ......
