Keysight Technologies InfiniVision 6000L Series, Service Manual

Page: 67 / 100

Troubleshooting
4
6000L Series Oscilloscopes Service Guide 67
f Connect the power cord and check the power supply voltage between pins 1
and 6 of the system board side of the “DC cable”. The voltage should be 15 V
±10%.
• If the voltage is correct, then test the system board (see page 67 ).
• If the voltage is not correct, then replace the power supply (see page 79 ).
To check the 6000L Series system board
1 Remove the cabinet.
2 Check that all cable connections are securely connected from the system board
to:
• Power supply
• Fan
3 Verify the voltages at the system board test points listed in the table below.
Refer to Figure 11 on page 66 to locate the test points.
Table 13 System Board Test Points
4 If the voltage at test point L3301 and/or L3302 is not within the specified
range, replace the system board.
5 If all cables are properly connected and none of the previous tests confirm a
failure on another assembly, replace 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!
Test point Voltage Output from
regulator:
L3204 3.3 (+- 0.1) U3202
L3201 5.0 (+- 0.1) U3202
L3301 1.5 (+- 0.1) U3300
L3302 -5.2 (+- 0.1) U3301