Tektronix RSA3303A Service Manual page 204

Troubleshooting
Use this procedure to determine
if an analyzer problem is caused
by the low voltage power supply.
Connect the analyzer to the correct power
source. Turn on the PRINCIPAL POWER
SWITCH on the rear panel, and then
STANDBY SWITCH on the front panel.
Are
the two fans
on the left side
working?
Yes
Is
the fan on
the CPU board
working?
Yes
Do
the twelve
power indicators (LED) on
the A70 DC power board
light? (See Figure
6- - 40.)
Yes
Check the test point voltages on A70
(see Table 6- - 7 and Figure 6- - 40).
Are
the voltages
OK?
Yes
The power supply is OK.
Figure 6- 33: Troubleshooting procedure 1 — Power supply system
6- 70
Check the power supply voltages on
the power supply 1 , 2, and 3 modules
(See Table 6- - 6 and Figure 6- - 38/6- - 39).
No
Replace the A70 DC power board.
No
Check the test point voltages on A70
(see Table 6- - 7 and Figure 6- - 40).
No
No
NOTE. Turn off the analyzer using the:
H STANDBY SWITCH when Windows XP is running.
H PRINCIPAL POWER SWITCH when Windows XP is not booted.
Are
No
the voltages
OK?
Yes
Are
No
the voltages Remove short circuit on the loading side.
OK?
Yes
Are
the two fans No
Replace the fan.
on the left side
working?
Yes
Is
the fan on
No
Replace the fan.
the CPU board
working?
Yes
RSA3303A & RSA3308A Service Manual
Replace the failed power supply module.
Check the power supply voltages on
the power supply module
(See Table 6- - 6 and Figure 6- - 38/6- - 39).
Are
Yes
the voltages
OK?
No