Technical data

Troubleshooting 4
4000 X-Series Oscilloscopes Service Guide 83
To prepare for internal assembly troubleshooting
1 Disconnect any external cables from the front panel.
2 Disconnect the power cord.
3 Remove the cabinet following the instructions on
page 104.
4 Remove the power supply shield and air duct following
the instructions on page 126.
5 Separate the front and rear decks following the
instructions on page 105. but leave all cables except the
WARNING
HAZARDOUS VOLTAGES EXIST — REMOVE POWER FIRST !
The procedures described in this section are performed with power supplied to the
oscilloscope and with the protective covers removed. Only trained service
personnel who are aware of the hazards involved should perform the procedures.
Whenever possible, perform the procedures with the power cord removed from the
oscilloscope. Read the safety notice at the back of this book before proceeding.
WARNING
HAZARDOUS VOLTAGES EXIST — HIGH VOLTAGE IS PRESENT ON POWER
SUPPLY HEAT SINKS !
The power supply heat sinks of the 4000 X-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
REMOVE POWER TO AVOID DAMAGE !
Do not disconnect any cables or remove any assemblies while power is applied to
the oscilloscope, or damage to the oscilloscope can occur.
CAUTION
AVOID ESD DAMAGE TO COMPONENTS !
ELECTROSTATIC DISCHARGE (ESD) can damage electronic components. Use
proper ESD precautions when doing any of the procedures in this chapter. As a
minimum, place the oscilloscope on a properly grounded ESD mat and wear a
properly grounded ESD strap.