Chapter 14 615
Analyzer Messages
Interpreting Analyzer Messages
φ LOCK OFF (U) (H)
Indicates slow YTO tuning. This message may appear if the analyzer is
using default correction factors. φ LOCK OFF appears briefly during
the CAL FREQ routine, during instrument preset, or when the
frequency value is changed; this is normal and does not indicate a
problem.
Related Assemblies
A6 YTO, A9 third converter, A25 counter lock.
Troubleshooting Hints
If this message appears constantly, perform the CAL FREQ routine to
try to eliminate this message.
ADC-GND FAIL (H)
During an instrument preset, the analog-to-digital converter reading
for ground 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
A7 analog interface, 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
error message. If the power-supply LEDs for both power 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 Table 14-2 to locate the source of the error message.
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