Display Board and Harness Replacement
4D3851
Reference: Use this instruction with replace-
ment part 4D3851.
Tools Needed: Phillips screwdriver, flat-
bladed screwdriver, adjustable
wrench, static grounding
(earthing) wrist strap (includ-
ed).
Warning-Hazardous Voltage
Warning-Internal components may
be damaged by static electricity.
CAUTIONS:
• Power cord must be disconnected
to prevent electric shock.
• Never unpack, touch or handle any
integrated circuit without wearing
a grounding (earthing) strap to
minimize your static charge.
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. Attach the static grounding strap to your
wrist and stick the adhesive end to a suit-
able bare-metal ground, such as the rear
panel.
5. Disconnect the keypad and display har-
ness assembly from the main circuit
board.
6. Disconnect the keypad and display con-
nectors (A) from the main harness.
7. Remove the four screws that attach the
keypad display board to the keypad (B).
8. Remove the four screws (C) that attach
the display to the keypad, and remove the
display.
9. Replace the old display board and har-
ness with the new one and reassemble by
reversing steps 1-8.
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).
4DP851R Rev1
(4D35 Service Manual)
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