IBM 3277 Troubleshooting Manual page 22

SYMPTOM INDEX (Cont)
Symptom
2. KEYBOARD MALFUNCTIONS (Cont)
C. Cursor Control Key Failures:
1. Failure of any or all cursor move keys:
~ J.
t......
-+t +- IE-
2. Data moves to left when
+-
key pressed . . . . . . . .
D. Operator Function Key Failures:
*1. ERASE FIELD
*2. ERASE INPUT . . . . . .
3. INS MODE . . . . . . .
3a. INPUT INHIBITED lights when
c~rsor
moves from last to first character position
4. DEL
5. RESET . . . . . . .
E. Program Access Key Failures:
1. CLEAR . . . . . . .
2. ENTER, PAl, PA2, PA3, TEST REO, or PFl-12
F. Keyboard Assembly
1. Keyboard Mechanical Failures (includes audible feedback) .
2. Keyboard Electrical Failures . . . . . . . . . . . . .
G. Audible Alarm Failures:
1. Fails to sound
2. Sounds when it should not
3. SELECTOR LIGHT-PEN MALFUNCTIONS
* A. Nothing happens when tip switch closed
*B. Lines appear and remain through all detectable characters with detect attempted
*C. Lines always appear through all detectable characters, even when pen not used
*0. Data not entered when selector light-pen initiates entry into system:
1. INPUT INHIBITED does not light
2. INPUT INHIBITED lights . . . . . . . . . . . . . . .
*E. Selector light-pen action changes verification characters correctly, but INPUT
INHIBITED lights . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*
Requires a formatted buffer.
Diagram Sheet or
Direct Action Repair
Sheet 14
Change cards C2, H2.
Sheet 18
Sheet 18
Sheet 18
Change card J2.
Sheet 19
Sheet 19
Sheet 20
Sheet 20
Sheet 20
Sheet 21
Sheet 21
Change cards G2, H2.
Sheet 22
Sheet 22
Sheet 22
Change card M2.
Change cards G2, M2.
Change card 02.
Symptom Index 3-6