310 Chapter6
General Troubleshooting
System Analyzer Programming Errors (100 to 150)
YTO Leveling Loop (334)
This error often requires troubleshooting the A14
frequency control assembly or A7 LODA (synthesizer
section) or the ADC circuits.
334 LO AMPL 1ST LO distribution amplifier is unleveled. Error 334
may be displayed if the front-panel LO OUTPUT is not
terminated into 50 ohms. This error is usually
accompanied by error codes 300 or 301. ERR 301 YTO
UNLK is cleared once ERR 334 has been cleared. Check
the output of the A11 YTO with the jumper on A14J23
in the TEST position. The YTO power output should be
between +9 and +13 dBm. If the YTO is working
properly, refer to "A7 LODA Drive" in Chapter 10. The
LODA AGC voltage is monitored by the ADC. ERR 334
is set if LODA AGC is outside of its prescribed limits.
Refer to "A7 LODA Drive" in Chapter 11.
Sampling Oscillator (335)
This error indicates an unlocked sampling oscillator
(also known as the offset lock loop).
335 SMP UNLK Sampling oscillator PLL is unlocked. ERR 335 is set if
OFL_ERR is outside its prescribed limits.
10 MHz Reference (336)
This message occurs during the internal IF calibration
routines. The routine locks the cal oscillator to the
internal 10 MHz reference, regardless of the setting of
INT/EXT REF.
336 10 MHz Ref Calibration oscillator failed to lock within 5 seconds
after going to internal 10 MHz reference. ERR 336 will
not be cleared until a successful full cal "LO Re-Align"
is executed.
Fractional N PLL (337)
This error indicates an unlocked fractional N phase
locked loop. This error only applies to the hardware in
an HP 8560 E-series or EC-series spectrum analyzer.
337 FN UNLK Fractional N circuitry is unable to lock.
YTO Loop Settling Errors (351 to 354)
These errors are generated when the YTO loop error
voltage will not stabilize at an acceptable value during
the YTO loop locking routines. These errors only apply
to the hardware in an HP 8560 E-series or EC-series
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