Chapter 6 307
General Troubleshooting
System Analyzer Programming Errors (100 to 150)
YTO Loop Errors (317 to 318)
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 10 to troubleshoot the
YTO PLL. The ADC circuit on the A3 interface
assembly may also cause this error.
317 FREQ ACC Main coil coarse DAC at limit. The main coil coarse
DAC is set to bring YTO ERR close enough to 0 volts for
the main coil fine DAC to bring YTO ERR to exactly 0
volts. ERR 317 is set if the main coil coarse DAC is set
to one of its limits before bringing YTO ERR close
enough to 0 volts.
318 FREQ ACC Main coil fine DAC at limit. The main coil fine DAC is
set to bring YTO ERR to 0 volts after the main coil
coarse DAC has brought YTO ERR close to 0 volts. ERR
318 is set if the main coil fine DAC is set to one of its
limits before bringing YTO ERR to 0 volts.
319 WARN COA The YTO coarse tune DAC is near its limits.
320 WARN FIN The YTO fine tune DAC is near its limits.
Roller Oscillator Errors (321 to 329)
These errors indicate a faulty roller oscillator on the
A14 frequency control assembly. Refer to Chapter 10.
The A3 interface ADC circuits may also be faulty. If
error codes 333 and 499 are also present, suspect the 10
MHz reference, the A21 OCXO, or the A15 assembly
(Option 103). These errors do not apply to the hardware
in an HP 8560 E-series or EC-series spectrum analyzer.
If they occur in an HP 8560 E-series or EC-series
spectrum analyzer, suspect a problem with the model
number identification in the spectrum analyzer
firmware.
321 FREQ ACC Main roller tuning sensitivity is not greater than 0.
The MAINSENSE voltage is noted in a locked condition
and the main roller is programmed to a frequency 400
kHz higher. ERR 321 is set if the new MAINSENSE
voltage is not greater than the previous MAINSENSE
voltage. 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.
322 FREQ ACC Main roller pretune DAC value set greater than 255.
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