HP 8562E Service Manual page 241

307 FREQ ACC
308 FREQ ACC
309 FREQ ACC
310 FREQ ACC
311 FREq ACC
312 FREQ ACC
7-22 General Troubleshooting
Transfer oscillator pretuned DAC out of range. The transfer oscillator
pretune procedure attempts to find pretuned DAC values by
programming the PLL to 25 different frequencies and incrementing
the transfer oscillator pretune DAC until XFRSENSE changes
polarity. ERR 307 is set if the DAC is set to 255 (maximum)
before XFRSENSE changes polarity. 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 oscillator pretune DAC not within prescribed limits at low
frequency. The offset oscillator pretune DAC is set to provide a
frequency less than 189 MHz while the PLL is programmed for
189 MHz. ERR 308 is set if XFRSENSE is greater than +5 V
(it should be at the negative rail). 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 oscillator pretune DAC not within prescribed limits at high
frequency. The offset oscillator pretune DAC is set to provide a
frequency less than 204 MHz while the PLL is programmed for
204 MHz. ERR 309 is set if XFRSENSE is greater than +5 V
(it should be at the negative rail). 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.
Main roller pretune DAC set to 255. The main roller pretune DAC is
set to 5, causing MAINSENSE to go to the positive rail. The DAC
is incremented until MAINSENSE changes polarity. ERR 310 is set
if the DAC is set to 255 before MAINSENSE changes to a negative
polarity. 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.
Main roller pretune DAC set to 255. The main roller pretune DAC is
set to 5, causing MAINSENSE to go to the positive rail. The DAC
is incremented until MAINSENSE changes polarity. ERR 311 is set
if the DAC is set to 255 before MAINSENSE changes to a negative
polarity. 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.
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 312 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.