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 improper sequence of storing data in EEROM. Check the EEROM 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) MORE 1 OF 2, SERVICE CAL DATA, FLATNESS ,and FLATNESS DATA. Enter a value of 130. Press PREV MENU, STORE DATA , YES, and [m).

3.Press INTEN, enter an intensity value of 90, and press

STORE INTEN.

4.Press MORE 1 OF 2 FOCUS, enter a focus value of 128, and press

STORE FOCUS. Turn the (LINE) switch off, then on, cycling the power.

5.If errors are still present, the EEROM A2U501 is defective. Refer to the EEROM replacement procedure in Chapter 3.

700 EEROM Check-sum error of EEROM A2U501.

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], MORE 1 OF 2, FACTORY PRSEL PK ,(SAVE),and SAVE PRSEL PK.

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