ILT.2690
The most likely fault is the YO (A26). However, rst
check the following items before going to RF.2690 to
replace the A26 assembly:
1. If the performance test fails at modulation rates of
about 100 kHz in AC FM, do the \YO Loop Gain"
adjustment.
2. If the performance test fails only in DC FM, the YO
driver (A13) may be at fault.
3. Go to ILT.2101 to check the FM driver (A11). If this
test fails then replace A11.
4. Go to ILT.2141 to check the modulation generator (A8)
if Option 002 is installed. If this test fails then replace
A8.
ILT.2695
The diagnostics already performed are probably
more accurate than the remaining procedures. These
procedures may not be able to identify the failed
assembly. This is particularly true when a specication
has only marginally failed. Before continuing, verify all
RF cable connections on the RF deck. If no problems are
found, go to ILT.2240.
Agilent 8360 Instrument Level Troubleshooting 1a-49
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