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Labsystems
351/352-100-X
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MULTISKAN RC and MS SERVICE MANUAL
NOT ENOUGH LIGHT FOR ADEQUATE SIGNAL LEVEL
Reason:
Signal level during gain adjust remained below minimum required value even
with highest possible lamp intensity and measure channel gain.
Action:
Check that the lamp did not fail duringpower up. One of the filters may be bad.
To determine which one, power up the instrument and count how many times
the filter is rotated before the red error led lights up. The count is the filter
number.
PLATE POSITION ERROR
Reason:
After measurement the plate
is
driven out to home position from the measuring
chamber. If the plate home sensor is not activated, this error is reported.
Action:
Check that the track rails are clean and not bent. Check that the drive belt
is
undamaged. If there is a squeak from the rails when the plate moves,
try
cleaning the rails with a piece of tissue dampened with silicone lubricating
spray. If thereis noise from the right handdrive belt pulley,put avery smalldrop
of lubricating oil to the pulley shaft.
Service:
Tq
to measure the plate. You can hear from the sound of the plate stepper if it
looses position.
If this happens, check that the upper and lower drive belts are not too tight. The
belts should be just tight enough to eliminate slack in the plate drive.
Three signals from
Dl
of MUSCU-RC control the plate stepper operation.
These are stepping direction control, pin 30, stepper enable, pin
29
and step
clock, pin 33. The direction control is high when the plate is driven towards the
measuring chamber and low when
it
is driven out. The stepper enable signal is
high except when the filter stepper is running. The step clock is a short active
high pulse, one for each step. If these signals don't seem to operate properly,
disconnect connectorX7 on MUSCU-RC and check again.
If
still not okay, Dl
is faulty, else the fault is on MOTCU board. The stepper enable and step clock
signals are common for both plate and filter stepper.
If
one of these is not okay,
the faulty component can be either
N1
or
N4.
If stepping direction signalis bad,
Nl is faulty.
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