Agilent Technologies 856290216 service manual Roller Oscillator Errors 321 to

317 FREQ ACC Main coil coarse DAC at limit. The main coil coarse DAC is set to bring YTO ERR close enough to 0 volts for the main coil fine DAC to bring YTO ERR to exactly 0 volts. ERR 317 is set if the main coil coarse DAC is set to one of its limits before bringing YTO ERR close enough to 0 volts.

318 FREQ ACC Main coil fine DAC at limit. The main coil fine DAC is set to bring YTO ERR to 0 volts after the main coil coarse DAC has brought YTO ERR close to 0 volts. ERR 318 is set if the main coil fine DAC is set to one of its limits before bringing YTO ERR to 0 volts.

319 WARN COA YTO coarse tune DAC near limit.

320 WARN FIN YTO fine tune DAC near limit.

Roller Oscillator Errors (321 to 329)

These errors indicate a faulty roller oscillator on the Al4 frequency control assembly. The A3 interface ADC circuits may also be faulty. If error codes 333 and 499 are also present, suspect the 10 MHz reference, the A21 OCXO, or the Al5 assembly (Option 103). These errors do not apply to the hardware in an HP 8560 E-Series spectrum analyzer. If they occur in an HP 8560 E-Series spectrum analyzer, suspect a problem with the model number identification in the spectrum analyzer firmware.

321 FREQ ACC Main roller tuning sensitivity is not greater than 0. The MAINSENSE voltage is noted in a locked condition and the main roller is programmed to a frequency 400 kHz higher. ERR 321 is set if the new MAINSENSE voltage is not greater than the previous MAINSENSE voltage. 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.

322 FREQ ACC Main roller pretune DAC value set greater than 255. During the LO adjust sequence, the main roller is locked and then programmed to a frequency 1.6 MHz higher. A new pretune DAC value is calculated based upon the main roller tuning sensitivity. ERR 322 is set if this calculated value is greater than 255. 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.

324 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 324 is set if the coarse adjust DAC cannot bring MAINSENSE close enough to 0 volts for the fine adjust DACs 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.

7-24 General Troubleshooting