Al5 Rf Assembly; Confirming A Faulty Third Converter; A7 Loda Drive - HP 8560A Service Manual

Y T O
A S V I N C R E A S E S __I
A 7 O U T P U T I N C R E A S E S

Al5 RF Assembly

Note
The block diagrams for the Al4 and Al5 assemblies are located in Chapter 10,
Synthesizer Section.

Confirming a Faulty Third Converter

1. Perform the IF Input Amplitude Accuracy performance test in the HP 8560A Installation
and Verification Manual if Option 002 is not present. This exercises most of the third
converter.
2. If the performance test fails or Option 002 is present, perform the External Mixer
Amplitude adjustment in Chapter 2 of this manual.
3. If adjustment cannot be made, disconnect W35 from A15J801.
4. On the HP 8560A press (PRESET) and set the controls to the following settings:
C E N T E R F R E Q
SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 Hz
5. Connect a signal generator to A15J801.
6. Set the signal generator to the following settings:
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..310.7MHz CW
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -28 dBm
11-10 RF Section
Figure 11-2. A7 LODA Drive
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..300MHz
1
J4
1
SAMPLER 1ST MIXER OUT OUT -9 13 TO TO -2 16 dh dBM
I
J 3
I
- - - - - J
R E F V O L T A G E
L
SCHEMAT I C
S K 1 1 1 5