HP 8560E Service Manual page 307

General Troubleshooting
System Analyzer Programming Errors (100 to 150)
the model number identification in the spectrum
analyzer firmware.
314 FREQ ACC 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 A14Q101. 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 or EC-series
spectrum analyzers. If it occurs in an HP 8560 E-series
or EC-series spectrum analyzer, suspect a problem with
the model number identification in the spectrum
analyzer firmware.
315 FREQ ACC 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 A14Q101. 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 or EC-series spectrum analyzers. If it
occurs in an HP 8560 E-series or EC-series spectrum
analyzer, suspect a problem with the model number
identification in the spectrum analyzer firmware.
316 FREQ ACC 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 or EC-series spectrum analyzers. If
it occurs in an HP 8560 E-series or EC-series spectrum
analyzer, suspect a problem with the model number
identification in the spectrum analyzer firmware.
306 Chapter 6