Service manual

2. TROUBLESHOOTING
Service Manual BSM-4100 2.3
Display Problems
Problem Possible Cause/Criteria Action
Faulty connection between CN108 on
the MAIN board and inverter.
Check the connections.
Faulty connection between inverter and
LCD unit.
Check the connections.
Faulty inverter board. Replace the inverter board.
No display and the backlight does not light.
Faulty backlight lamps. Replace the backlight lamps.
Faulty connection between CN102 on
the MAIN board and CN102 on the
connection board.
Check the connection.
Faulty connection between CN103 on
the connection board and LCD unit.
Check the connection.
Faulty LCD unit. Replace the LCD unit.
No display, but the backlight lights.
Faulty MAIN board. Replace the MAIN board.
Faulty LCD unit. Replace the LCD unit.
Fine vertical or horizontal lines on the LCD.
Faulty MAIN board. Replace the MAIN board.
Thick vertical or horizontal stripes on the
screen.
Faulty MAIN board. Replace MAIN board.
Faulty MAIN board. Replace the MAIN board.
The characters or waveforms are distorted.
Faulty connection between CN102 on
the MAIN board, connection board and
LCD.
Check the connection.
Battery operation. Set the POWER SAVE MODE
to OFF on the SYSTEM SETUP
screen.
Dirt on the touch screen (inside or
outside).
Clean the surface of touch
screen.
The backlight lamps are near the end of
its useful life.
25,000 hours for revision no. before CA
50,000 hours for revision no. CA or later
Replace the backlight lamps.
The display is dim and the brightness control
does not make it brighter.
Faulty connection between CN108 on
the MAIN board and inverter board.
Check the connection.
Faulty Operation board. Replace the Operation board.
The Diagnostic Check screen appears in the
monitor mode and “OK” is displayed at the
POWER ON CHECK RESULT.
Faulty MAIN board. Replace the MAIN board.
Faulty MAIN board. Replace the MAIN board.
The Diagnostic Check screen appears in the
monitor mode and an error message is
displayed at the POWER ON CHECK
RESULT. Refer to “Power On Self Check” in
Section 3.
Faulty DPU board. Replace the DPU board.
Software bug.
Perform the system
initialization.
Faulty MAIN board. Replace the MAIN board.
The screen with a “Check Program Running”
message does not change to the next screen
after the power is turned on.
Faulty DPU board. Replace the DPU board.
Faulty MAIN board. Replace the MAIN board.
System error information appears at the upper
left corner on the screen in the monitor mode
and the instrument restarts.
Faulty DPU board. Replace the DPU board.
More than 25 pixels on the screen do not light
or have abnormal color. Note that up to 25
pixels with such a problem is considered
normal.
Faulty LCD unit. Replace the LCD unit.
No waveform is displayed but the connection
cord for each vital sign is recognized.
Faulty MAIN board. Replace the MAIN board.
No waveform is displayed and the connection
cord for each vital sign is not recognized.
Refer to each vital sign troubleshooting
section.
Refer to each vital sign
troubleshooting section.