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90000 A-Series Service Guide
4
Troubleshooting
reading you will get will be very low (near 0 ohms). Replace either assembly if
needed.
Measuring the acquisition assembly resistance b12 V and ground
If no shorts are found on the bulk +12 V supply trace or if you have fixed all the
shorts and the oscilloscope still will not turn on, follow these steps, which include
replacing parts with known good parts until you discover the problem.
1
Replace the bulk +12 V power supply with a known good supply.
2
If the oscilloscope still does not power on, replace the motherboard with a
known good one.
3
If the oscilloscope still does not power on, replace the front panel ON/OFF
switch with a known good one.
4
If the oscilloscope still does not power on, then the backplane assembly is
causing the problem and must be replaced.
5
Once the faulty board or switch is discovered, be sure to reinstall all other parts
that were removed, as they were not the cause of the problem.
Summary of Contents for Infiniium 90000A Series
Page 1: ...Keysight Infiniium 90000 A Series Oscilloscopes Service Guide...
Page 6: ...6 90000 A Series Oscilloscopes Service Guide...
Page 12: ...12 90000 A Series Service Guide 1 General Information...
Page 18: ...18 90000 A Series Service Guide 2 Calibration...
Page 116: ...116 90000 A Series Service Guide 5 Replacing Assemblies...
Page 120: ...120 90000 A Series Service Guide 6 Replaceable Parts Fan and Acquisition Assembly...
Page 121: ...Replaceable Parts 6 90000 A Series Service Guide 121 Power Supply and PC Motherboard...
Page 122: ...122 90000 A Series Service Guide 6 Replaceable Parts Sleeve and Accessory Pouch...
Page 128: ...128 90000 A Series Service Guide 7 Theory of Operation Oscilloscope block diagram...
Page 135: ......