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325
FREQ
ACC
326
FREQ
ACC
327 OFF UNLK
328
FREQ
ACC
329
FREQ
ACC
Unable to adjust MAINSENSE to 0 volts using the fine adjust DAC.
The coarse adjust and fine adjust DAC are used together to set
MAINSENSE to 0 volts with the loop opened. ERR 32.5 is set if the
fine adjust DAC cannot bring MAINSENSE to 0 volts. 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.
Fine adjust DAC near end of range. The fine adjust DAC is set to
bring MAINSENSE to 0 volts. ERR 326 is set if the fine adjust DAC
value is set to less than 5 or greater than 250. 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.
Offset roller oscillator PLL is unlocked. May indicate loss of 10 MHz
reference. The 10 MHz reference should measure greater than -7
dBm
at A15J303. The ADC measures
OFFSENSE
at the beginning of each
sweep and, if the voltage is outside certain limits, the offset oscillator
pretune DAC is adjusted to bring
OFFSENSE
within the proper
range. ERR 327 is set if this cannot be accomplished. 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.
Roller fine adjust DAC sensitivity less than or equal to 0. During the
LO adjust routine, the fine adjust DAC is set to two different values
and the MAINSENSE voltage is measured at each setting. ERR 328
is set if the difference between these voltages is 0 or negative. This is
typically the result of the main roller loop being unlocked. 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.
Roller coarse adjust DAC sensitivity less than or equal to 0. During
the LO adjust routine, the coarse adjust DAC is set to two different
values and the MAINSENSE voltage is measured at each setting.
ERR 329 is set if the difference between these voltages is 0 or negative.
This is typically the result of the main roller loop being unlocked.
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 Error (331)
This error rarely occurs but is usually indicative of a digital hardware
failure.
331
FREQ
ACC
Invalid YTO frequency. Firmware attempted to set the YTO to a
frequency outside the range of the YTO (2.95 to 6.8107 GHz). Suspect
a digital hardware problem, such as a bad RAM on the A2 controller
assembly. Contact the factory.
General Troubleshooting 7-25