Keypad Replacement
3D3511/4D3511
Reference: Use this instruction with replace-
ment part 3D3511 or 4D3511.
Tools Needed: Phillips screwdriver, flat-
bladed screwdriver, adjustable
wrench.
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. Pull the keypad panel down.
Note: If you have a 4D3 cryoscope with no
suffix, the keypad does not pull down.
It is mounted to the front half of the
case, with nuts and locking hardware.
4. Disconnect the keypad and display con-
nectors (A) from the main harness.
5. Remove the four screws that attach the
keypad to the keypad assembly (B).
6. Remove the four screws (C) that attach
the display to the keypad, and remove the
display.
7. Replace the old keypad with the new one
and reassemble by reversing steps 1-6.
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).
4DP511 Rev0
(4D35 Service Manual)
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