Maintenance 6
Access Procedures
wWarning
Follow the instructions under "Initial Access Procedure" to make sure high voltage has been bled off before you touch anything inside the 5725A.
If you work on a 5725A with the power cord attached, and/or you are not certain the high voltage has not bled off, do not wear a grounded wrist strap. Wearing a strap increases risk of dangerous electrical shock.
Use extreme caution when you are working inside the 5725A with the power connected. Use only
The voltage output transistor heat sinks are at lethal voltage potential in ac V standby and ac V operate modes during normal operation, and possibly in any other mode after a failure. The heat sinks are exposed when any assembly is in the service position, and when the heat sink cover is removed.
Initial Access Procedure |
Before accessing any module from the top or bottom of the instrument, proceed as follows to remove the top cover and verify that high voltage on the power supply capacitors has been bled off:
1.Turn off the POWER switch.
2.Remove the line power cord from ac line power.
3.Wait three minutes.
4.Remove the top cover by removing the screws accessible on the top surface (three front, three rear).
Warning
Before touching anything inside the 5725A, do the following steps to make sure high voltage has been bled off.
5.Refer to Figure