Agilent Technologies 8564EC, Service Manual

Page: 74 / 512

86 Chapter 2
Adjustment/Diagnostic Software
To Use the Diagnostics
1. Using the 8564E and 8565E adjustment/diagnostic software, select
the RF diagnostics.
2. Connect the test board (P/N 08564-69201) between the A14
frequency control assembly and the microcircuits (A7 LOMA and
A10/A12 RYTHM/SBTX). The test board is labeled
µ
CKT
and
INSTR SIDE
.
a. Disconnect W16 from A14J9 and W12 from A14J10.
b. Connect W16 to J4 on the test board and W12 to J5 on the test
board.
c. Connect J2 on the test board to A14J10 (use 24-conductor ribbon
cable, part number 08564-60012).
d. Connect J1 on the test board to A14J9 (use 20-conductor ribbon
cable, part number 8120-5526).
3. You will then be prompted to make different connections to the
85629B Test and Adjustment Module (TAM), a source or spectrum
analyzer. Connection locations are shown in
Figure 2-10 on page 87
and Figure 2-11 on page 88 . Carefully follow the instructions on the
controller display. Read the prompts VERY carefully! If a wrong
connection is inadvertently made, the result could lead to a wrong
determination of the fault. (The software could tell you that the
SBTX/RYTHM is faulty, when in fact the real fault is in the A8 low
band mixer, a much less expensive component.)
4. If a failure occurs, the diagnostic software indicates what failed, for
example:
Low Band
, and then prompts you to perform the test(s) that
exercises that function or area (
"Low Band Check"
).