Tektronix RSA3408B, Service Manual

Page: 200 / 250

Troubleshooting
5- 72
RSA3408B Analyzer Service Manual
Replace
A10 A/D board or
A42 DIFP board
Reconnect the W32 cable.
Unplug the coaxial cable W610 on
the RF6 module (See Figure 5--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 76 MHz
±
10 Hz
Amplitude: --2 dBm
±
7.2 dB
No
Yes
Unplug the coaxial cable W502 on
the RF5 module (See Figure 5--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 76 MHz
±
10 Hz
Amplitude: --8 dBm
±
3 dB
No
Yes
Replace RF6 module.
From page 5--71 To page 5--73
Unplug the coaxial cable W250 on
the RF2 module (See Figure 5--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 421 MHz
±
10 Hz
Amplitude: --15 dBm
±
3 dB
Unplug the coaxial cable W503 on
the RF6 module (See Figure 5--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 345 MHz
±
10 Hz
Amplitude: +5 dBm
±
3 dB
Yes
No
Yes
Replace RF5 module.
No
Unplug the coaxial cable W29 on the
RF4 module (See Figure 5--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 43.125 MHz
±
10 Hz
Amplitude: --2 dBm
±
3 dB
Replace RF6 module.
Yes
Replace RF4 module.
No
Unplug the coaxial cable W201 on
the RF3 module (See Figure 5--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 4231 MHz
±
10 Hz
Amplitude: --20 dBm
±
3 dB
No
Replace
RF2 module or
RF4 module.
Yes
Check gain and offset values of
the RF3 module in the service
menu. Refer to Reconfiguration of
RF Modules on page 4--33.
Are the
gain and offset values
set correctly?
Replace
RF3 module or
RF4 module.
Enter the correct gain and offset
values of the RF3 module. Refer to
Reconfiguration of RF Modules on
page 4--33.
Restart the analyzer.
Yes
No
Figure 5- 36: Troubleshooting procedure 3 — Signal path (Cont.)