Tektronix RSA3300A, Service Manual

Page: 221 / 284

Troubleshooting
RSA3303A & RSA3308A Service Manual
6- 75
Modify the signal generator
controls as follows:
Frequency: 100 MHz
Level: --50 dBm
Is
the spectrum
displayed with correct
amplitude?
No
Change the reference level from
--20 to --42 dBm in one dB step
on the analyzer.
Yes
Replace RF5 module.
Modify the signal generator
controls as follows:
Frequency: 100 MHz
Level: 0 dBm
Change the reference level from
+30 to +10 dBm in one dB step
on the analyzer.
Is
the spectrum
displayed with correct
amplitude?
No
Yes
Replace the step attenuator 1.
Perform the gain calibration
(Refer to page 5--16).
Does the
display report
any errors?
Unplug the coaxial cable W119 from
J302 on the A100 Interconnection
board (See Figure 6--38/6--39).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 50 MHz
±
10 Hz
Amplitude: --30 dBm
±
3 dB
No
Yes
Does
the output level
increase to --18 dBm
±
2 dB
transiently when pressing the
Calibrate Gain
side key?
Replace
Step attenuator 1 or
A100 Interconnection board.
Yes
Replace A100 Interconnection board.
No
Unplug the coaxial cable W13 from
J301 on the A100 Interconnection
board (See Figure 6--38/6--39).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 50 MHz
±
10 Hz
Amplitude: --30 dBm
±
3 dB
Yes
No
Replace RF4 module.
RF2 band check
(RSA3308A only)
Modify the analyzer controls
as follows:
Center frequency: 3.5 GHz
Span: 1 MHz
Reference level: 0 dBm
Is
the spectrum
displayed with correct
frequency and
amplitude?
No
Modify the signal generator
controls as follows:
Frequency: 3.5 GHz
Level: --10 dBm
Yes
No
Yes
RSA3308A
RSA3303A
From page 6--74 To page 6--76
Figure 6- 35: Troubleshooting procedure 3 — Signal path (Cont.)