332 Chapter7
General Troubleshooting
Error Messages
LOMA (Local Oscillator Multiplier/Amplifier) Leveling Loop
Errors (338 to 340)
These errors are generated when one of the LOMA
(localoscillator multiplier/amplifier) loops is unlevelled.
These errors only apply to the hardware in an
8564E/EC or 8565E/EC spectrum analyzer.
338 LOMA AGC The LOMA main loop AGC is unleveled. Error 338
may be displayed if the front panel LO OUTPUT is not
terminated in 50 ohms. This error is usually
accompanied by error codes 300 or 301. ERR 301 YTO
UNLK is cleared once ERR 338 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 LOMA Drive" in Chapter 12. The
LOMA AGC voltage is monitored by the ADC. ERR 334
is set if LOMA AGC is outside of its prescribed limits.
Refer to "A7 LOMA Drive" in Chapter 12.
339 SBTX AGC The LOMA SBTX (switched barium-tuned mixer) loop
AGC is unleveled. If ERR 338 LOMA AGC is also
present, refer to ERR 338. Otherwise, refer to "A7
LOMA Drive" in Chapter 12.
340 SAMP AGC The LOMA (local oscillator multiplier/amplifier)
sampler loop AGC is unleveled. If ERR 338 LOMA AGC
is also present, refer to ERR 338. Otherwise, refer to
"A7 LOMA Drive" in Chapter 12.
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 8560 E-series or EC-series
spectrum analyzer.
351 SETL FLD YTO error voltage is not settling.
352 TWID FLD Unable to bring YTO error voltage DAC's to quiescent
point.
353 SRCH FLD No acceptable YTO DAC value found.
354 LK ITERS Cannot lock. Lock iteration routine terminated.
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