Head Up Relay or Head Down Relay Replacement
3D3109
Reference: Use this instruction with replace-
ment part 3D3109.
Tools Needed: Phillips screwdriver, flat-
bladed screwdriver.
Warning-Hazardous Voltage
Warning-Internal components may
be damaged by static electricity.
CAUTION: Improper connections
may cause damage to the instrument.
Instruction:
1. Turn off the power and unplug the instru-
ment.
2. Remove the screws securing the instru-
ment cover, and remove the cover (see
below):
The following instructions refer to 4D3
cryoscopes with suffix "A" or later, and
to all 3D3 osmometers:
a. Remove the two sets of screws from
the side panels and the two screws
from the rear panel.
b. Slide the instrument cover up and off.
The following instructions refer to 4D3
cryoscopes without a suffix:
a. Remove the heat transfer fluid from
the front cover.
b. Remove the two screws from the rear
panel of the back cover and lift off the
back cover.
c. Remove the four screws from under-
neath the front cover, lift the front
cover slightly up and then slide it for-
ward and off.
3. Locate the Head Up/Head Down Relay on
the inside rear wall. Note the wire colors
and the corresponding connectors, and
then remove the connectors.
4. Remove the two screws (A) from the
relay and replace the old relay with the
new one.
5. Reassemble by reversing steps 1-4.
For additional information or technical assistance,
please contact Advanced Instruments Hot-Line
®
Service Center (U.S. 1-800-225-4034, outside
North America +US 1-781-320-9000).
3DP109 Rev0
(4D35 Service Manual)
Page 1
Head Up Relay
Head Down Relay
A
A
Blue
Orange
Blue
White
Brown
Yellow
Brown
Gray
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