Environnement MIR 9000 - LCD, Technical Manual

Page: 121 / 154

Duplication prohibited MIR 9000
5–7
February 2000
DISPLAY CAUSE POSSIBLE ACTIONS
IR Source supply
–
The mains voltage of the IR Source
is outside the limits.
–
Compare the value of Channel 6 of
the multiplexer (“Tests /MUX
Signals” menu) with the value
shown on the control document.
–
Check the J14 and J15
connections.
–
Check the feed +5V.
–
Check the voltage adjustment
connected to J15.
–
The IR source is faulty
–
Dismount the IR source and check
the filament (red emission). If
necessary, change the IR source
and restart the amplification chain.
Peltier current
Peltier check
–
The Peltier current is outside the
limits.
Alarm for I Peltier >1200 mA Control
for I Peltier > 1000 mA.
–
Compare the values of Channel 2 of
the multiplexer (“Tests /MUX
Signals” menu) with the value
shown on the control document.
–
Adjust the current to its initial value
with potentiometer P1 on the
motherboard. Re-make a zero
reference.
–
If the adjustment cannot be made:
•
Check that the internal temperature
of the analyzer is not higher than
the correct one.
•
Check the connections of the 2,2
Ω
resistance and of the transistor on
J24.
•
The room temperature is too high
for the Peltier setting.
•
Change the CI LM723 (IC1).
•
The detector is faulty. Change the
detector and re-start the
amplification chain if the signals are
correct in Pt 0.
STP board
–
The stepping motor (NH
3
/ H
2
O
version) does not obey the
commands of the microprocessor.
–
Control the connection of the
motors and of the optical forks.
–
Control the position of the straps on
the motor power boards.
–
Control the optical forks.
–
Dismount the detector assembly
and source assembly to check that
the sequences are made correctly
and specifically correlation wheel
pin search during a reference cycle.
STP command
–
The driving board of the stepping
motors (NH
3
/ H
2
O version) does not
communicate with the
microprocessor.
–
Check the connection of the driving
board (connector J19).
–
Control the position of the straps on
the driving board.