ILT.3084
The problem is not isolated, but the following are possible
failures:
The rear panel SMI (A19) is faulty.
W31 is faulty (connects A19 to the motherboard).
The ALC assembly (A10) is faulty. This is true if
leveling is the problem.
The source module used with the synthesizer is faulty.
To conrm this, try to use the front panel SMI, or
substitute either a new source module or synthesizer.
A remote possibility exists that the motherboard (A22)
is faulty.
If these alternatives do not x the problem, use
the instrument block diagram (located behind the
\Troubleshooting Block Diagrams" tab) to troubleshoot
this problem.
ILT.3085
Either the rear panel SMI (A19) or the ribbon cable (W23)
is faulty. Inspect the ribbon cable. Replace the A19
assembly or W23, and go to the Troubleshooting F
oldout,
block 1 (located just prior to the \Special Cases" tab).
ILT.3090
GPIB problems involve a ribbon cable and one of three
assemblies. The assemblies are listed below from most to
least likely to fail. First, run the GPIB port self-test that
follows. If this self-test fails, the CPU assembly (A15) is
the most likely failure. If this test passes, change the
assemblies in the order listed.
1. Ensure that nothing is connected to the GPIB
connector.
2. Press
4
PRESET
54
SERVICE
5
.
3.
Select
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Selftest Menu
.
4. Press
4
236
54
ENTER
5
.
5.
Select
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Do Test #236
.
Most likely failures:
1. An excessive length of GPIB cable. (The specication
for length of GPIB cable is no more than 2 meters per
Agilent 8360 Instrument Level Troubleshooting 1a-65
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