Tektronix RSA3303A Service Manual page 206

Troubleshooting
This procedure helps you
determine whether the signal path
is bad.
Baseband check
Set the analyzer as follows:
Center frequency: 10 MHz
Span: 1 MHz
Reference level: 0 dBm
Set the signal generator as follows and
connect it to the analyzer RF input
(Refer to Performance Verification):
Frequency: 10 MHz
Level: - - 10 dBm
Is
the spectrum
displayed as follows?
Frequency: 10 MHz ±10Hz
Amplitude: - - 10 dBm
±1 dB
No
Unplug the coaxial cable W30 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: 51.2 MHz ±10 Hz
Amplitude: +16 dBm
±3 dB
No
Replace RF5 module.
Figure 6- 35: Troubleshooting procedure 3 — Signal path
6- 72
Reconnect the W30 cable.
Unplug the coaxial cable W25 on the
RF3 module (See Figure 6- - 37).
Using another spectrum analyzer,
measure the output at the connector.
the spectrum
measured as follows?
Frequency: 10 MHz
Amplitude: - - 20 dBm
Replace
Yes A10 A/D board,
A40 DIFP board
A20 DDC board
A40 Memory board
Unplug the coaxial cable
W108 (RSA3303A)/W121 (RSA3308A)
of the step attenuator 1 on the bottom
(See Figure 6- - 38/6- - 39). Using another
spectrum analyzer, measure the output
at the connector.
Yes
the spectrum
measured as follows?
Frequency: 10 MHz
Amplitude: - - 20 dBm
Replace
Step attenuator 2,
Band relay, or
A100 Interconnection board.
Is
No
±1 dB
Yes
1
,
2
, or
2
Is
Replace
Step attenuator 1,
No
Input relay, or
A100 Interconnection board.
±1 dB
Yes
1
S/N B020000 and above.
2
S/N below B020000 and J300100 and above.
RSA3303A & RSA3308A Service Manual
Reconnect the W25 cable.
Unplug the coaxial cable
W109 (RSA3303A)/W105 (RSA3308A)
of the step attenuator 2 on the bottom
(See Figure 6- - 38/6- - 39). Using another
spectrum analyzer, measure the output
at the connector.
Is
the spectrum
measured as follows?
Frequency: 10 MHz
Amplitude: - - 20 dBm
±1 dB
Yes
Replace RF1 module.
To page 6- - 73
No