Agilent Technologies 8590 Series Service Manual page 636

Analyzer Messages
Interpreting Analyzer Messages
The Video RAM Failure Code.
The last four digits identify the failure address for the video RAM on
the A16 assembly. A video RAM failure code indicates an internal
failure on the A16 assembly; the section of the video RAM circuitry that
is tested is not connected to other instrument assemblies. Convert the
four digits to binary and interpret them with
Table 14-6 A16 Video Ram Address Failure Code Interpretation
Digits From
Example
* The acronym MAD stands for "Multiplexed Address and Data." There are
no separate address and data lines within the A16 video RAM.
636
Equivalent
Binary Value
F →
8
→
4
→
2
→
1
8
7 →
4
→
2
→
1
8
4
2 →
2
1
D →
8
→
4
2
→
1
Table 14-6.
A16 Circuit Tested
Error at MAD 15 *
Error at MAD 14
Error at MAD 13
Error at MAD 12
Error at MAD 11
Error at MAD 10
Error at MAD 9
Error at MAD 8
Error at MAD 7
Error at MAD 6
Error at MAD 5
Error at MAD 4
Error at MAD 3
Error at MAD 2
Error at MAD 1
Error at MAD 0
A16 Reference
Designator
U306
U305
U306
U305
U306
U305
U306
U305
U306
U305
U306
U305
U306
U305
U306
U305
Chapter 14