The OsmoPRO
®
Micro-Osmometer Service Manual
Troubleshooting Table
59
1. No power, or abrupt
loss of power (no dis-
play)
2. Keypad malfunction
Power availability.
Power connection to grid.
Power connection to product.
Fuse check.
Power supply.
Circuit board connections.
If cause is not identified.
Keypad cable connection.
Worn or damaged keys.
Temporarily unplug the power cord
from its wall outlet and replace it with a
known workable lamp or other appli-
ance. If no power is present, have the
power restored.
Unplug the power cord from the power
cord socket. Measure the AC voltage
supplied at the end of the cord that will
be connected to the product.
Make sure the power cord is firmly
plugged into the socket on the back of
the product.
Unplug the power cord from the power
entry module. Use a small screwdriver
to pry out the fuse holder. Visually
check the two 5 mm x 20 mm fuses for
a blown fuse. If there is any doubt, test
the fuses with a continuity checker or
ohmmeter, or simply replace them. Also
check the values marked on the fuses to
make sure that they are the correct rat-
ing for the product. If a fuse was blown
and a replacement blows too, contact
Advanced Instruments Product Service
Department for assistance.
Check for 12 V DC/16 Amp on the
power distribution board.
Check that all connectors on the circuit
board are properly connected and that
there are no damaged wires. Firmly
insert all connectors. If wiring damage
has occurred, contact Advanced
Instruments Product Service Department
for assistance.
Contact Advanced Instruments Product
Service Department for assistance.
Verify that the keypad cable is properly
attached to the circuit board.
Inspect the keypad for worn or damaged
keys. If damage is found or suspected,
replace the keypad.
Symptom Check Suggested Action
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