HP HP-97 User Manual

Component-Level Maintenance HP=-97
4-28. KEYBOARD TROUBLESHOOTING
4-29. If keyboard does not respond when any Kkey is pressed check for:
(1) Bad connection between logic board and keyboard.
(2) Bent connector pins.
(3) Bad keyboard.
If pressing a key apparently results in the entering of a function of some
other key, check for bowed or damaged key spring strips.
4-30. DISPLAY TROUBLESHOOTING
4-31. Figure 4-19 shows the LED digit structure. To test, key in
-8.888888888-88. Display should correspond to the numbers keyed in.
Possible problems as shown in figure 4-20 are:
A. Digit overly bright or dim.
B. Digit has tendency to turn on another digit, causing ghost image to
appear.
C. One digit missing segment(s).
D. All digits missing same segment(s).
E. Single digit missing. (Refer to paragraph 4-33).
F. Same segment of all digits added.
G. Segment has tendency to turn on another segment, causing ghost image to
appear.
[—__a_:] A— I’:l,l,:l,ll:l,l’:; Four 8's entered
. b B —— :::":”:"F” Three 8's entered
C——» I_II"NI_II Four8's entered
]
0
L
0]
[:
D
—»
I
Four
8's
entered
. c E —» ”:; ”__H:” Four 8's entered
L D h L F ——» ":, "’:””:”,’:" Four 7's entered
;I G —» I,:I,;:l’;:ll - Three 8’s entered
Figure 4-19. LED Digit Figure 4-20. Display Problems
4-26

HP HP-97 Specifications

General

Brand	HP
Model	HP-97
Category	Calculator
Language	English