Eprom removal and replacement, Operation – Ohaus TP Series Electronic Balance User Manual

Page 114

EPROM Removal and Replacement

A medium phillips screwdriver and a
small flat bladed screwdriver will be
required.

Remove the pan and pan sup-
port.

If the balance is equipped with a
draft shield, remove it.

Using a phillips screwdriver, re-
move the three screws which
secure the cover to the bal-
ance. The balance will have to
be turned over or on its side to
access the screws as they are
located on the bottom; two un-
der the front panel and one on
the rear (see diagram).

Turn the balance right side up
and remove the cover.

Gently press the EPROM into
the socket making sure all pins
enter the socket.

If the pins on the new EPROM
are spread too wide to easily fit
into the socket, bend all pins on
one side at the same time
against a table top or other flat
surface. Repeat this for the pins
on the other side.

Replace the cover and fasten
the three screws that were re-
moved.

10. Replace pan and pan support.

11. Reconnect power to the bal-

ance, turn it on and allow it to
warm up for at least ten min-
utes.

12. Calibrate the balance following

the procedure outlined in the
instruction manual.

OPERATION

With the EPROM installed, the
weighing units and modes shown in
the adjacent table will be avaliable.
The units shown in boldface type
(tex

tex

tex, denier

denier

denier and yarn count

yarn count

yarn count) are

added with the new EPROM.

TEX:

TEX: On TP balances, Tex is based
on a 100 meter sample. Since Tex is
defined as the weight (in grams) of a
1,000 meter sample, the balance
displays the weight of a 100 meter
sample times 10.

DENIER:

DENIER: On TP balances, Denier is
based on a 90 meter sample. Since
Denier is defined as the weight (in
grams) of a 9,000 meter sample, the
balance displays the weight of a 90
meter sample times 100.

Locate the EPROM (U14) on
the printed circuit board.

Remove the EPROM from its
socket. If necessary, insert the
flat bladed screwdriver under
the edge of the EPROM and
carefully pry it out of the socket.

Hold cover and base
together while removing
screws. DO NOT allow
cover or base to fall.

NEW EPROM

SOCKET

NOTCH

Position the new EPROM over
the socket as shown in the dia-
gram. Make sure the notch on
the end of the EPROM is aligned
with the notch on the socket.

Pins spread

too wide.

Bend pins inward if needed.

MODE or

DISPLAY

UNIT

INDICATOR

grams

pennyweight

dwt

carats

ounces

troy ounces

ozt

grains

tex

ttttt

denier

:::::

pound

yarn count

custom unit
parts counting

percent weighing

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