IBM 3277 Troubleshooting Manual page 20

SYMPTOM INDEX (Cont)
Symptom
1. DISPLAY MALFUNCTIONS (Cont)
C. Display Position and Size: (Cont)
4. Rows of characters not evenly spaced
5. Display not centered (Diag 3-7)
6. Display tilted (Diag 3-6) . . .
D. Dlaracters:
1. No characters displayed, but cursor displayed.
(See
Symptom 2B4 if keyboard
Diagram Sheet or
Direct Action Repair
Change analog card
See centering procedure
(5.2.1.5).
See yoke adjustment
procedure (5.2.1.4)
problem only.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sheet 7
2. 0 isplay out of sync. (Characters may be recognizable but are moving, and more
than one cursor is seen. INPUT INHIBITED not lighted.) (Diag 3-15) Sheet 6
3. Character(s) not formed correctly wherever displayed on screen Change card K2.
4. Screen full of quote marks (no Device Check) . . . . . . . . Change cards A2, K2.
a. Quote mark in location 0 and cursor in location 1 after POR Replug connector inside
5. Wrong character displayed from program, keyboard, or POR:
a. Without Device Check
b. With Device Check . . . . . . . . . . . . . . . . .
6. Data displayed that should not . . . . . . . . . . . . .
7. Screen full of one character with or without INPUT INHIBITED lighted
8. Screen slowly fills with character of last keyboard key pressed. INPUT
INHIBITED not lighted
9. Attribute characters displayed
E. Cursor:
1. No cursor on screen, but rest of display normal (no Device Check) . . . . . .
2. No cursor with INPUT INHIBITED lighted. Cursor cannot be returned to screen
by Power On Reset or CLEAR key . . . . . . . . . . . . . . . . . . .
3. Cursor appears normally. INPUT INHIBITED lighted . . . . . . . . . . . .
4. Cursor under all or most character positions, and Device Check indicated (INPUT
INHIBITED lighted) (Diag 3-13) . . . . . . . . . . . . . . . . . . . .
5. Cursor under all character positions, but Device Check not indicated (Diag 3-13) .
6. Cursor not positioned correctly under a character; may be in character area
7. Cursor too long or too short . . . . . . . . . . . . . . . . . . . .
8. No cursor, and INPUT INHIBITED not on. Partial cursor appears as each
character enters until 80 characters in row appear with partial cursor under each
character. Occurs on one row at a time . . . . . . . . . . . . . . . . . .
9. Screen slowly fills with cursors . . . . . . . . . . . . . . . . . . . . .
10. Cursor appears in three or four rows equally spaced on left side of display after
PORe Characters mayor may not enter and appear at cursor location. Display
may blink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. No cursor on screen after PORe Characters may enter, but only first scan 1ine of
each row displays as character enters. (INPUT INHIBITED not lighted)
keyboard.
Change card K2.
Sheet 7
Sheet 8
Sheet 8
Change card A2.
Sheet 8
Change card K2.
Sheet 9
Sheet 9
Sheet 10
Change card K2.
Change card K2.
Change card K2.
Change card J2.
Change cards A2, C2, H2.
Sheet 10
Change card J2.
Symtom Index 3-3