EPROM Replacement
716811R
(4D3 Instruments with Serial Suffix A through E*)
Reference: Use this instruction with replace-
ment part 716811R.
Tools Needed: Phillips screwdriver, flat-
bladed screwdriver, static
grounding (earthing) wrist
strap (included), 28-pin IC
removal tool (alternatively, a
small screwdriver may be
used with caution so as not to
damage the IC or the socket).
Warning-Hazardous Voltage
Warning-Internal components may
be damaged by static electricity.
CAUTIONS:
• Instrument calibration and all cus-
tomized settings will be lost when
the EPROM is replaced. Therefore,
make sure the current sample and
block probe bin numbers and the
sample stir amplitude are recorded
in the service log so that you can
reset these vital numbers into the
replacement EPROM.
• Never unpack, touch or handle an
EPROM or any other integrated
circuit without wearing a ground-
ing (earthing) strap to minimize
your static charge.
*EPROM Replacement 716811R may be used
to update the operating software in all
Advanced Model 4D3 cryoscopes with serial
numbers prior to suffix F that contain a 256K
EPROM main board.
To determine if your instrument contains a
256K EPROM main board, remove the cover
and look at the upper left corner of the main
board. If your board contains component Q9,
you still have the 256K EPROM main board
and can use this upgrade.
Upon completion of this replacement, the
software version reported at power-up will
match the version number printed on the new
EPROM.
Instruction:
1. Turn off the power and unplug the instru-
ment.
2. Attach the static grounding strap to your
wrist and stick the adhesive end to a suit-
able bare-metal ground.
3. Remove the screws securing the instru-
ment cover, and remove the cover:
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.
4. Locate EPROM IC U8 on the circuit
board. (U8 bears a white label indicating
the software version number.) Note the
orientation of the small locating notch in
one corner, and/or locating mark on one
edge of the IC.
5. Make sure your static draining connection
is intact, and then remove IC U8 from the
circuit board.
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).
71P811R Rev1
(4D35 Service Manual)
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