MULTISKAN RC and MS SERVICE MANUAL
potentiometer
R3
on the CHOPT hoard. Turning the potentiometer clockwise with
a screwdriver should reduce chopper speed and counterclockwise increase. If
nothing happens, measure voltage at pin 6 of Nl. It should be 6.8..7.5 V. Ifnot, the
faulty component likely
is
N1. With the oscilloscope, observe pin
3
of
N3.
A pulse
output with same frequency
as
test point X11 should be present.
If
not, the faulty
component likely is N3.
If
the cycle time measured
at
test point XI1 is 5.1 to 6.1
ms and theinstrument stillreports low chopper speed,Dl on MUSCU-RC is faulty.
When the problem is fixed, adjust cycle time at test point X1 1 to as close to 5.1
ms as possible, rather more than less.
Chopper speed can also be adjusted without an oscilloscope using STATUS
command to observe chopper speed. Adjust to 1440
...
1470
rpm.
COMMAND ERROR
Reason: The instrument received an unknown command or a command with invalid
parameters.
Action:
Checkvalidcommands and parameters fromchapter 'Remote control commands
for Multiskan RC'.
FILTER NOT INSTALLED
IN
FILTER WHEEL
Reason: The filter number requested is not installed on thefilter wheel.
Action:
Use onlyfilter numbers actually installed. At least one filter must be installed!
FILTER NOT USABLE FOR AGGLUTINATION
Reason:
The signallevel with currently selected filter is not adequate for measuring with
aperture plate in agglutination measure position. This usually happens with
filters of short wavelength.
Action:
Use longer wavelength filters for agglutination measurement. If one of the
longerwavelength filters gives thisenor, then the filter inquestionlikely is bad.
If several filters give this error, first check that the focusing lenses and upper
optics are clean. If cleaning does not help, the optical system should be checked
by a service person.
Document Release
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Section Page
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Labsysterns
8 14
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