Agilent Technologies 856290216 service manual OFF Unlk Freq ACC, YTO Loop Error

325 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.

326 FREQ ACC 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.

327 OFF UNLK

328 FREQ ACC

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.

329 FREQ ACC 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