If Section; Troubleshooting Using The Tam; A4 And A5 Test Connectors - HP 8560A Service Manual

Note Because the Cal Oscillator circuitry on the A4 assembly is such an integral
part of the IF adjustment, always check this assembly first, before checking
the rest of the IF Section. A faulty Cal Oscillator can cause many apparent
"faults" in the rest of the IF Section.

Troubleshooting Using the TAM

When using Automatic Fault Isolation, the TAM indicates suspected circuits that need to be
manually checked. Use Table 8-l to locate the manual procedure.
Table 8-2 lists assembly test connectors associated with each Manual Probe Troubleshooting
test. Figure 8-l illustrates the location of A4 and A5 test connectors. Figure 8-2 illustrates
the levels and paths through the IF Section.
Note HP 85629B Test and Adjustment Modules with firmware revisions A through
F cannot make valid measurements on test connectors A4J9, A4J10, or A4Jll.
J5
J8
C O N N E C T O R
J4
J3
A 5 I F
C O N N E C T O R
Figure 8-1. A4 and A5 Test Connectors
A 4 L O G A M P
J5
J6
J3

IF Section 8-3

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