Agilent Technologies 856290216 service manual General Troubleshooting

307 FREQ ACC 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.

308 FREQ ACC 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.

309 FREQ ACC 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.

310 FREQ ACC 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.

311 FREq ACC 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.

312 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 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.

7-22 General Troubleshooting