Tektronix RSA3300A, Service Manual

Page: 219 / 284

Troubleshooting
RSA3303A & RSA3308A Service Manual
6- 73
Modify the signal generator
controls as follows:
Frequency: 10 MHz
Level: --30 dBm
Is
the spectrum
displayed with correct
amplitude?
No
Change the reference level from
+20 to --30 dBm in one dB step
on the analyzer.
Yes
Is
the spectrum
displayed with correct
amplitude at the reference level
of +20 dBm, +10 dBm,
0 dBm, and
--10 dBm?
No
Yes
Is
the spectrum
displayed with correct
amplitude at the reference level
of --2 dBm, --4 dBm,
--6 dBm, and
--8 dBm?
No
Yes
Replace A10 A/D board.
Replace
Step attenuator 2 or
A100 Interconnection board.
Replace
Step attenuator 1 or
A100 Interconnection board.
Is
the level of
spurious signal at center
screen --95 dBm
or less?
RF1 band check
Modify the signal generator
controls as follows:
Output: Off
Modify the analyzer controls
as follows:
Center frequency: 100 MHz
Span: 1 MHz
Reference level: 0 dBm
Perform the center offset
calibration (Refer to
page 5--18).
No
Replace
A10 A/D board,
A40 DIFP board
1
, or
A20 DDC board
2
Modify the signal generator
controls as follows:
Frequency: 100 MHz
Level: --10 dBm
Is
the spectrum
displayed with correct
frequency and
amplitude?
Unplug the coaxial cable W32 on the
RF5 module (See Figure 6--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 10 MHz
±
10 Hz
Amplitude: +5 dBm
±
3 dB
No
Yes
Replace RF5 module.
No
Yes
Yes
From page 6--72 To page 6--74
1
S/N B020000 and above.
2
S/N below B020000 and J300100 and above.
Figure 6- 35: Troubleshooting procedure 3 — Signal path (Cont.)