11
The Advanced
®
Model 3250/4250 Service Manual
General Description and Purpose
Advanced
®
Osmometers and Cryoscopes
determine the concentration of solutions
through freezing-point depression measure-
ment. Osmometers are used primarily to
measure body fluids such as serum and urine,
and cryoscopes are used to determine the
freezing points of various liquids and to
detect added water in milk. Application infor-
mation is available upon request.
Except for different cooling assemblies,
stir/freeze wires, sample sizes and software,
the 3250 and the 4250 are identical to one
another. For clarity when replacing parts or
troubleshooting, the instructions indicate any
significant differences between the two instru-
ments.
The Service Manual
This Service Manual contains:
• instructions for performing repairs.
• guides for troubleshooting operational and
mechanical problems.
• circuit system illustrations.
• information about replacement parts and
service repairs.
This manual is designed to assist
service technicians, and does not
imply a license to perform repairs
without proper qualifications.
Service Assistance
To contact Advanced Instruments Product
Service:
• Call (800) 225-4034 (toll-free within the
USA and Canada; after normal business
hours, dial extension 2191)
• Call +US (781) 320-9000 (elsewhere)
• Or fax (781) 320-3669
When calling Advanced Instruments, have the
model and serial number from the label on the
back of the instrument, and a description of
the problem. Use a telephone as close to the
instrument as possible in order to facilitate
making recommended diagnostic checks.
A service technician may assist in making
minor repairs over the phone, providing you
with recommended parts (or part numbers), or
may issue an authorization (RMA) to ship the
instrument for factory repair.
The RMA procedure is as follows:
1. Contact Advanced Instruments to obtain
an RMA.
2. Pack and ship the instrument in its origi-
nal carton. Do not send instrument sup-
ply items.
3. Prepay shipment to the factory. Advanced
Instruments cannot accept collect ship-
ments. Insure the shipment or accept the
damage risk.
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