Tektronix 1705A instruction manual Reading Data Stored AT 60H to 7F in Processor

Maintenance

Once communication with the NOVRAM is verified, the microprocessor will attempt to store data. While attempting to store data, the following message is displayed on the crt:

READING 2444:

DATA STORED AT 60H TO 7F IN PROCESSOR

If data cannot be stored in the NOVRAM, the following message will be displayed on the crt:

ERROR : CANNOT STORE DATA

If data cannot be stored, the probable fault is with either the NOVRAM (U812) or U809 and associated components.

Once the NOVRAM test is successfully completed, there will be an acknowledg- ing crt display. See Figure 6-3.

END OF NON VOLATILE <2444> RAM TEST:

2444 TEST GOOD

PRESS [INPUT] KEY TO EXIT

Figure 6-3: 1705A CRT display when the NOVRAM Test has been successfully completed

There is a special case that can occur. In normal operation, the 1705A front-pa- nel setup should be stored when the power is removed (either turned off or lost due to power failure) so that it can be recalled when the instrument is powered up again. If the 1705A does not come back with its previous front-panel setup, it will provide an error message. See Figure 6-4.

6- 6 1705A Spectrum Monitor