Program Rom Check-Sum Errors (705 To 710) - HP 8560A Service Manual

improper sequence of storing data in EEROM. Check the EEROM
5. If errors are still present, the EEROM A2U501 is defective. Refer
700 EEROM
701 AMPL CAL
Check-sum error of frequency response correction data.
702 ELAP TIM
Check-sum error of elapsed time data.
703 AMPL CAL Check-sum error of frequency response correction data. Default values
being used.
704 PRESELCT Check-sum error of customer preselector peak data. External
preselector data recalled in internal mode, or internal preselector
data recalled in external mode. To clear the error, press (RECALL],

Program ROM Check-sum Errors (705 to 710)

The instrument power-on diagnostics perform a check-sum on each
programmed ROM (A2 Controller assembly). If an invalid check-sum
is found for a particular ROM, an error code is generated. If a
defective programmed ROM is found, replace it with another ROM
with the same HP part number. Refer to Chapter 4, "Replaceable
Parts."
Although some of these errors might result in a blanked display, it is
possible to read these errors over HP-IB. Refer to "Troubleshooting to
a Functional Section" in this chapter.
705 ROM U306 Check-sum error of program ROM A2U306.
706 ROM U307 Check-sum error of program ROM A2U307.
707 ROM U308 Check-sum error of program ROM A2U308.
6-32 General Troubleshooting
The EEROM on A2 is used to store data for frequency response
correction, elapsed time, focus, and intensity levels. Error codes from
700 to 703 indicate that some part of the data in EEROM is invalid.
An EEROM error could result from either a defective EEROM or an
with the following steps:
1. Place the WR PROT/WR ENA jumper on the A2 Controller
assembly in the WR ENA position.
2. On the spectrum analyzer, press ICAL)
SERVICE CAL DATA, FLATNESS
value of 130. Press PREV MENU, STORE DATA
STORE INTEN.
STORE FOCUS. Turn the (LINE) switch off, then on, cycling the
power.
to the EEROM replacement procedure in Chapter 3.
Check-sum error of EEROM A2U501.
MORE 1 OF 2, FACTORY PRSEL PK
MORE 1 OF 2,
, YES, and [m).
enter a focus value of 128, and press
SAVE PRSEL PK.