Keysight Technologies InfiniVision 6000L Series, Service Manual

Page: 65 / 100

Troubleshooting
4
6000L Series Oscilloscopes Service Guide 65
To check the 6000L Series oscilloscope power supply
1 Disconnect the power cord from the oscilloscope. Then remove the oscilloscope
cover.
2 Connect the negative lead of the multimeter to a ground point on the
oscilloscope.
3 Connect the power cord and turn on the oscilloscope.
4 Measure the power supply voltage at J3200, pin 9 on the system board. See
Figure 11 on page 66. The voltage should be 15 V ±10%. If the voltage is
correct, the power supply is working correctly.
WARNING
HAZARDOUS VOLTAGES EXIST — HIGH VOLTAGE IS PRESENT ON DSO6000L SERIES POWER SUPPLY
HEAT SINKS !
The power supply heat sinks of the 6000L Series oscilloscopes are at a high potential. This presents an
electric shock hazard. Protect yourself from electric shock by keeping this area covered or by not coming
in contact with the heat sinks when the power cord is attached to the oscilloscope!
CAUTION
USE AN EXTERNAL FAN TO AVOID OVERHEATING COMPONENTS !
When you remove the oscilloscope cover and main shield, use an external fan to provide continuous air
flow over the heat sinks. Air flow over the heat sinks is reduced when the cover and main shield are
removed, which leads to higher than normal operating temperatures. Have the fan blow air across the
system board where the heat sinks are located. Otherwise, damage to the components can occur.
NOTE
If the power supply fuse is blown, the power supply is defective, and you must replace it. See
the “Replaceable Parts” chapter for information about removing the power supply.