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313 FREQ ACC
314 FREQ ACC
315 FREQ ACC
316 FREQ ACC
Error in LO synthesis algorithm. ERR 313 is set if a combination of
sampler oscillator and roller oscillator frequencies could not be found
to correspond to the required YTO start frequency. Contact the
factory. This error is not applicable to HP 8560 E-Series spectrum
analyzers. If it occurs in an HP 8560 E-Series spectrum analyzer,
suspect a problem with the model number identification in the
spectrum analyzer firmware.
Indicates problems in the span calibration. Troubleshoot any unlocks
before attempting to troubleshoot span calibration problems, because
the loops must all lock in order to perform the calibration. If LO
spans greater than 1 MHz are correct, check A14U114B , A14U115A,
A14U116, or
A14QlOl.
This error message appears when the main
roller oscillator sweep sensitivity is 0. A sweep ramp is injected into
the locked main roller loop which should generate a negative-going
ramp on MAINSENSE. ERR 314 is set if the slope of this ramp
is 0. This is an indication of an unlocked main roller loop or lack
of a sweep ramp. This error is not applicable to HP 8560 E-Series
spectrum analyzers. If it occurs in an HP 8560 E-Series spectrum
analyzer, suspect a problem with the model number identification in
the spectrum analyzer firmware.
Indicates problems in the span calibration. Troubleshoot any unlocks
before attempting to troubleshoot span calibration problems, because
the loops must all lock in order to perform the calibration. If LO
spans greater than 1 MHz are correct, check A14U114B , A14U115A,
A14U116, or
A14QlOl.
This error message appears when the roller
span attenuator DAC is out of range. This DAC value is recalculated
each time there are changes to the span or start frequency. ERR 315
is set if this value is less than 10 or greater than 245. This error is not
applicable to HP 8560 E-Series spectrum analyzers. If it occurs in
an HP 8560 E-Series spectrum analyzer, suspect a problem with the
model number identification in the spectrum analyzer firmware.
Sensitivity of main roller pretune DAC is 0. Once the main roller
is locked, the MAINSENSE voltage is measured and the pretune
DAC value is incremented by two. ERR 316 is set if the difference
between the new MAINSENSE voltage and the previous MAINSENSE
voltage is 0. This error is not applicable to HP 8560 E-Series spectrum
analyzers. If it occurs in an HP 8560 E-Series spectrum analyzer,
suspect a problem with the model number identification in the
spectrum analyzer firmware.
YTO Loop Errors (317 to 320)
These messages indicate that the YTO main coil coarse DAC (ERR
317) or fine DAC (ERR 318)
is at its limit. If error codes 300 or 301
are not present, a hardware problem exists in the YTO loop but the
loop can still acquire lock. Refer to Chapter 11, “Synthesizer Section,”
to troubleshoot the YTO PLL. The ADC circuit on the A3 interface
assembly may also cause this error.
General Troubleshooting 7-23