IBM PC 300 Maintenance Service Manual page 65

Table 2-3 Error Symptoms List
Error Symptoms Action/FRU
NOTE: To diagnose a problem, first find the error symptom in the left column. If
directed to a check procedure, replace the FRU indicated in the check
procedure. If no check procedure is indicated, the first Action/FRU listed in right
column is the most likely cause.
Data/fax modem "Factory-Installed Modem Card" on page 70.
software program
invokes but cannot
receive/send
data/fax.
Video and Monitor
Video memory test Remove all non-factory cards.
failed.
Load default settings (if screen is readable).
Video adapter
System board
failed.
Display problem: Monitor signal connection/cable.
- Incorrect colors
Monitor
- No high intensity
System board
- Missing, broken,
or
incorrect
characters
- Blank
monitor(dark)
- Blank
monitor(bright)
- Distorted image
- Unreadable
monitor
- Other monitor
problems
Display changing Monitor signal connection/cable
colors.
Monitor
System board
Display problem "Monitor" on page 79.
not listed above
Load default settings (if screen is readable).
(including blank or
System board
illegible monitor).
Parallel
NOTE: Execute "Load BIOS Default Settings" in BIOS Setup to confirm ports'
presence before diagnosing any parallel/serial ports problems.
Serial or parallel Make sure that the LPT# or COM# you test is the same as
port loop-back test is set in BIOS Setup.
failed.
Loop-back.
System board.
Printing failed. Make sure that the printer driver is properly installed.
Refer to the service manual for the printer.
Printer.
Printer cable.
System board.
Printer problems. Refer to the service manual for the printer.
Joystick
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