Service manual

2. TROUBLESHOOTING
Service Manual BSM-4100 2.5
Recording Problems
Problem Possible Cause/Criteria Action
Faulty connection between CN103 on the
MAIN board and Power SW board.
Check the connection.
Faulty Power SW board. Replace the Power SW board.
Recording mark does
not appear on the
screen when the
record key is pressed.
Faulty MAIN board. Replace the MAIN board.
Faulty connection between CN122 on the
MAIN board and recorder unit
Check the connection.
Faulty magazine position sensing micro
switch of the recorder unit.
Replace the micro switch. Refer to
Section 8 “Replaceable Parts List”.
Paper magazine open
mark appears on the
screen.
Faulty MAIN board. Replace the MAIN board.
Faulty connection between CN122 on the
MAIN board and recorder unit.
Check the connection.
Faulty paper detection photo sensor or
LED of the reorder unit.
Replace the photo sensor and
LED. Refer to Section 8
“Replaceable Parts List”.
Out of paper mark
appears on the
screen.
Faulty MAIN board. Replace the MAIN board.
Faulty connection between CN122 on the
MAIN board and recorder unit.
Check the connection.
Faulty paper drive motor of the recorder
unit.
Replace the motor. Refer to
Section 8 “Replaceable Parts List”.
Recording paper does not feed
properly.
Recording can be
performed when the
paper is manually
pulled out after the
record key is pressed.
Faulty MAIN board. Replace the MAIN board.
Wrong position of the recording paper in the magazine. Load the paper into the magazine
correctly.
Paper other than Nihon Kohden is used. Use the Nihon Kohden paper.
Photo sensor for detection of the black square on the paper is dirty. Clean the sensor.
Faulty connection between CN122 on the MAIN board and
recorder unit.
Check the connection.
Faulty black square detection photo sensor or LED of the recorder
unit.
Replace the photo sensor and
LED. Refer to Section 8
“Replaceable Parts List”.
For page-dependent recording
such as trendgraph and vital
sign list, the recording does
not start at the top of the page
Faulty MAIN board. Replace the MAIN board.
Thermal array head is dirty
Clean the head.
Paper other than Nihon Kohden is used.
Use the Nihon Kohden paper.
Platen roller has a damage or is deformed. Replace the roller.
The recorded data such as
waveform and grid has a faint
part on the paper.
The supply voltage for thermal array head (+24 V DC) decreases.
Replace the MAIN board.
There is missing dots on the
recorded data.
Faulty thermal array head if the dots are missed at the same
position on the paper after the head is cleaned.
Replace the head.
Straight line is recorded at the
same position on the paper.
Faulty thermal array head or recorder unit after head is cleaned. Replace the head or recorder unit.
There is different contrast
between the upper half and
lower half of the paper.
The thermal array head is incompletely attached to the recorder
unit.
Attach the head correctly.
Dirty gear or platen roller. Clean the gear and platen roller.
Faulty gear or platen roller Replace the faulty one.
Faulty MAIN board Replace the MAIN board.
The paper speed is unstable
and waveform is compressed
or extended on time scale.
Unstable turn of the paper
drive motor
Faulty motor Replace the motor.
Abnormally loud rotating
sound of the paper drive motor
Faulty gear or platen roller Replace the faulty one.
The heat-sensitive side of the paper is not faced to the thermal
array head.
Load the paper into the magazine
correctly.
Paper other than Nihon Kohden is used. Use the Nihon Kohden paper.
Faulty connection between CN121 on the MAIN board and
recorder unit.
Check the connection.
The supply voltage for thermal array head (+24 V DC) decreases. Replace the MAIN board.
No recording on the paper
Faulty thermal array head. Replace the head.