HP 5890 SERIES II Service Manual page 15

PART C OPERATOR INSTIGATED INDICATIONS
This section discusses the visual information that the operator can instigate and use as part of the trou-
bleshooting process. These visual indications are normally not available unless specifically requested
by the operator.
There are several functions of the CALIB AND TEST (Clear Dot) modes that can be used as a diagnos-
tic tool. Similarly, the TEST CHROMATOGRAM can be extremely useful. Each of these operator insti-
gated functions is specifically designed to aid the overall troubleshooting process and is activated from
the keyboard.
Of the ten functions accessible through the CALIB AND TEST (Clear Dot), five may be thought of as
servicing functions. The other five functions are generally thought of as operational functions. These are
explained in the operation and reference manuals.
To enter any of the CALIB AND TEST (Clear Dot) modes, press: the Clear key, the Decimal key and a
number from 0 through 9. The actual digits 4,5,7,8,9 represent the typical test modes. These are as
follows:
CLEAR DOT 4
CLEAR DOT 5
CLEAR DOT 7
CLEAR DOT 8
CLEAR DOT 9
To escape from any of the CALIB AND TEST (Clear Dot) modes press any of the instrument function
keys.
Calib and Test (Clear Dot 4) Display Memory
This diagnostic routine is initiated from the keyboard by pressing: Upon entering this mode, a single
memory address (ADDR:) and a value (VAL:) will appear on the instrument front panel visual display.
At this time, both the address and the value will be displayed in hexadecimal. In this hexadecimal
mode, the value displayed is two bytes (four digits) of information. The rightmost two digits (one byte)
represent the actual contents of the indicated address. The other two digits correspond to the contents
of the next address. For example, if address 1111 were keyed in and the value F224 resulted, 24 is
the contents of address 1111 and F2 is the contents of address 1112. This could be verified by ad-
dressing 1112; then the F2 would become the two rightmost digits (i.e., 3DF2).
In the Display Memory mode, some keys on the keyboard are redefined:
A key becomes A in hexadecimal.
B key becomes B in hexadecimal.
COL COMP1 key becomes C in hexadecimal.
COL COMP2 key becomes D in hexadecimal.
ON key becomes E in hexadecimal.
OFF key becomes F in hexadecimal.
The Decimal Point key increments the address.
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DISPLAY MEMORY
SELFTEST
HPIL LOOPBACK TEST
SET PID CONTROLS
DISP TEMP & DEMAND
SVC 1- 8