HP HP-97 - Page 73

HP-97
Component-Level Maintenance
REPLACE IC’S IN
ACCORDANCE
WITH POINT AT
WHICH CAL-
CULATOR HALTS
OR LOOPS (SEE
TABLE 4-4).
DISPLAY:
“ERROR”
?
RETURN TO STEP 1 OF
FUNCTIONAL TEST, TABLE 4-3.
“ERROR” DISPLAY
IMMEDIATELY FOLLOW
CARD READ OR WRITE
REPLACE:* YES
CRC, ROM 6,
ROM 0.
RETURN TO STEP 1 OF
FUNCTIONAL TEST, TABLE 4-3.
A
PRESS: 3 DD
REPLACE IC’'S IN ACCORDANCE
WITH DISPLAYED VALUE (SEE
TABLE 4-5).
*REPLACE THE INDICATED IC’'S ONE AT A TIME, RETURNING
TO STEP 1 OF FUNCTIONAL TEST AFTER EACH REPLACE-
MENT. CONTINUE REPEATING THE FUNCTIONAL TEST,
REPLACING IC’S UNTIL ERROR DISPLAY IS NOT GENERATED.
NOTE: THE DIAGNOSTIC TEST, PART TWO (PARAGRAPH
3:25) MUST BE CONDUCTED ON ANY UNIT IN WHICH IC’S
HAVE BEEN REPLACED.
Figure 4-3. IC Replacement Flowchart, Functional Test