A15 Rf Assembly; Confirming A Faulty Third Converter; Confirming A Third Converter Output - HP 8560E Service Manual

RF Section

A15 RF Assembly

A15 RF Assembly
The block diagrams for the A14 and A15 assemblies are located in
NOTE
Chapter 10, "Synthesizer Section."
Confirming a Faulty Third Converter
1. Perform the "IF Input Amplitude Accuracy" performance test in the
2. If the performance test fails or Option 002 is present, perform the
3. If adjustment cannot be made, disconnect W35 (coax 92) from
4. On the HP 8560E/EC, press
5. Connect a signal generator to A15J801.
6. Set the signal generator to the following settings:
7. If a flat line is displayed within 2 dB of the reference level and the
8. If a flat line is displayed within 2 dB of the reference level and the
9. Disconnect the signal generator and reconnect W35 (coax 92) to
Confirming a Third Converter Output
1. Connect the HP 8560E/EC CAL OUTPUT to the INPUT 50 Ω
2. Set the HP 8560E/EC to the following settings:
3. Press
598
HP 8560 E-Series Spectrum Analyzer Calibration Guide if Option
002 is not present. This exercises most of the third converter.
"External Mixer Amplitude Adjustment" in Chapter 2.
A15J801.
following settings:
Center frequency ...................................................... 300 MHz
Span ..................................................................................0 Hz
Frequency ....................................................... 310.7 MHz CW
Power ................................................................................. −28 dBm
performance test passed, troubleshoot microcircuits A7, A8, A9, and
A13.
performance test failed, troubleshoot the A15 RF Assembly.
A15J801.
connector.
Center frequency ...................................................... 300 MHz
Span ..................................................................................0 Hz
Input attenuation ...........................................................10 dB
, ,
SGL SWP CAL
and set the controls to the
PRESET
.
IF ADJ OFF
Chapter 11