Tektronix RSA3300A, Service Manual

Page: 220 / 284

Troubleshooting
6- 74
RSA3303A & RSA3308A Service Manual
Replace
A10 A/D board,
A40 DIFP board
1
, or
A20 DDC board
2
Reconnect the W32 cable.
Unplug the coaxial cable W31 on the
RF3 module (See Figure 6--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 39 MHz
±
10 Hz
Amplitude: --20 dBm
±
1 dB
No
Yes
Unplug the coaxial cable W207 on
the RF2 module (See Figure 6--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 39 MHz
±
10 Hz
Amplitude: --18 dBm
±
3 dB
No
Yes
Replace RF5 module.
Unplug the coaxial cable W208 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: 383 MHz
±
10 Hz
Amplitude: --5 dBm
±
3 dB
No
Unplug the coaxial cable W29 on the
RF4 module (See Figure 6--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 47.875 MHz
±
10 Hz
Amplitude: --5 dBm
±
3 dB
Replace RF5 module.
Yes
Unplug the coaxial cable W201 on
the RF3 module (See Figure 6--37).
Using another spectrum analyzer,
measure the output at the connector.
Is
the spectrum
measured as follows?
Frequency: 4232 MHz
±
10 Hz
Amplitude: --33 dBm
±
3 dB
No
Replace RF4 module.
No
Replace
RF2 module or
RF4 module.
Yes
Yes
Check gain and offset values of
the RF3 module in the service
menu. Refer to Reconfiguration of
RF Modules on page 5--31.
Are the
gain and offset values
set correctly?
Replace
RF2 module or
RF4 module.
Enter the correct gain and offset
values of the RF3 module. Refer to
Reconfiguration of RF Modules on
page 5--31.
Restart the analyzer.
Yes
No
From page 6--73 To page 6--75
1
S/N B020000 and above.
2
S/N below B020000 and J300100 and above.
Figure 6- 35: Troubleshooting procedure 3 — Signal path (Cont.)