618 Chapter14
Analyzer Messages
Interpreting Analyzer Messages
ADC-TIME FAIL (H)
During an instrument preset, the time between analog-to-digital
conversion readings is greater than the test limit. An instrument preset
routine is also performed during the self-calibration routines.
Related Assemblies
A16 processor/video assembly.
Troubleshooting Hints
If the instrument does not sweep, and all other instrument functions
are normal, the probable cause of the error message is a defective A16
processor/video assembly.
ADC-2V FAIL (H)
During an instrument preset, the analog-to-digital converter reading
for the +2 V reference on the A16 processor/video assembly is outside
the test limit. An instrument preset routine is also performed during
the self-calibration routines.
Related Assemblies
A8 power supply, A15 motherboard, A16 processor/video assembly,
assemblies installed in the card cage.
Troubleshooting Hints
The +15 V and −15 V supplies from the A8 power supply can cause this
problem. If the power-supply LEDs for both supplies are on, check that
the supplies are within tolerance using the test points on the A16
processor/video assembly.
A voltage greater than +10 Vdc on pins 1, 3, 5, 7, or 31 of A16J1 can
cause this error message. Refer to Figure 14-2 for the numbering order
of the A16J1 connector pins that are accessible from the component side
of the A16 assembly. If a voltage greater than +10 V is present on any
one of the A16J1 pins indicated, use Figure 14-2 to locate the source of
the error message.
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