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Troubleshooting
Checking the power supply voltages
You will need a digital voltmeter to check power supply voltages.
1.
Power off the mainframe and remove any modules installed in it.
2.
Power on the instrument.
3.
Connect the reference lead of a digital voltmeter to chassis ground, such as
the top of the power supply.
4.
Attach a 0.025 inch square pin to the probe tip of the other lead and insert it
into a pin on one of the connectors. The voltages at the pins are labeled on the
back of the Power Side board, and are listed in the following table:
Power supply voltages
Power Side board connector
Voltage (labeled on back of board)
via
Ground
via
+ 12 VD
via
+ 5 VD
via
+ 3.3 VD
via
+ 5 SB
via
On/STBY
P2 (A24, B24, C24)
+5 VA
P2 (A17, B17, C17)
-5 VA
P2 (A15, B15, C15)
+15 VA
P2 (A13, B13, C13)
-15 VA
5.
Measure the power supply voltages with the voltmeter and compare each
reading to the values listed in the table. If the voltages are within about 5% of
the nominal voltages, your power supply is functional. For more information
about the power supply, refer to the description of the low voltage power
supply. (See page 6.)
If the instrument will not
boot
If a monitor connected to the DVI-I port shows instrument information, but the
instrument LCD does not turn on or display boot-up information, replace the
display assembly (LCD, lamps, and cable).
If there is no display:
1.
Connect a monitor to the external DVI-I port. Make sure that the external
monitor is turned on.
2.
At boot time and while using an external monitor connected to the external
video port, repeatedly press
DEL
to enter the instrument BIOS setup.
3.
Select the
Chipset
menu.
4.
Select the
North Bridge Con
fi
guration
menu.
DSA8300 Digital Serial Analyzer and Modules Service Manual
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Страница 96: ...Replaceable parts list Figure 23 ATX assembly 80 DSA8300 Digital Serial Analyzer and Modules Service Manual ...
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