Agilent Technologies 856290216 service manual General Troubleshooting

302 OFF UNLK 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 pretuned DAC is adjusted to bring OFFSENSE within the proper range. ERR 302 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.

303 XFR UNLK Transfer 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 XFRSENSE at the beginning of each sweep and, if the voltage is outside certain limits, the transfer oscillator pretuned DAC is adjusted to bring XFRSENSE within the proper range. ERR 303 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.

304 ROL UNLK Main 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 MAINSENSE at the beginning of each sweep and, if the voltage is outside certain limits, the main roller pretune DAC is adjusted to bring OFFSENSE within the proper range. ERR 304 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.

305 FREQ ACC Unable to adjust MAINSENSE close to 0 volts using the coarse adjust DAC. The coarse adjust and fine adjust DAC are used together to set MAINSENSE to 0 volts with the loop opened. ERR 305 is set if the coarse adjust DAC cannot bring MAINSENSE close enough to 0 volts for the fine adjust DAC to bring MAINSENSE to exactly 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.

306 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 306 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.

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