Beehive International B102 Service Manual page 16

Table 5-1. Troubleshooting Flow DIagrann Index
Apparent Failure
Troubleshooting
Flow Diagram
GENERAL
No raster present
5-1A
No raster present 5-1B
OFF LINE
Cursor either absent, multiple cursors, cursor not in home position or
screen filled with video blocks
5-2A
No character displayed when written,non cursor advance
5-2B
Wrong character displayed 5-2C
No escape functions 5-2D
No control functions
5-2E
ON LINE
No data being transmitted 5-3A
Transmits invalid data
5-3B
No reception 5-3C
Receives invalid data and/or improper parity 5-3D
DISPLAY
All displayed characters out of focus
5-4A
Roiling display
5-4B
Display too tall/short for screen size
5-4C
Height of displayed characters uneven
5-4D
Display too wide/narrow for screen size
5-4E
Display not centered
5-4F
Tilted display
5-4G
Others
A. Single vertical line
B. Physical damage
C. Dot in center of screen
D. Uneven intensity/focus
E. Burned phosphor
F. Uneven display dimensions
G. Excessive H.V. Arcing
5-4 H
5-3