Technical data

94 6000 Series Oscilloscopes Service Guide
4 Troubleshooting
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 14 on page 92. The voltage
should be 15 V ±10%. If the voltage is correct, the power
supply is working correctly.
5 If the voltage is not correct:
1 Disconnect the power cord.
2 Remove the fan. See “To remove the fan” on page 152.
3 Disconnect plug J3 from the power supply and from the
system board.
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.
6000_series_service_guide.book Page 94 Friday, March 23, 2007 2:43 PM